Firefighters should wear scuba in hazardous atmospheres because exposure to particulate contaminants such as smoke can cause lung cancer or cardiovascular disease.
What are particulate contaminants?Particulate contaminants are macro or microscopic solid or liquid materials that float in the atmosphere. When these materials are present in an amount capable of causing a health hazard, they are described as pollutants.
Examples of particulate contaminants are smoke, dust, ashes, etc. They constitute health hazards when inhaled and bioaccumulated to a certain level in the body.
Some of the health hazards they constitute include cancer, cardiovascular problems, kidney problems, etc.
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Scientists in the field of evo-devo have determined that evolutionary changes can be a result of changes in ________.
Scientists in the field of evo-devo have determined that evolutionary changes can be a result of changes in homeotic genes.
Homeotic genes are a class of genes that regulate how the body forms in the early stages of organism development. These genes produce proteins known as transcription factors that instruct cells to generate different body components.
In the hierarchy of genes governing the initial stages of embryonic development in Drosophila, homeotic genes play a key role. They are involved in defining the unique identities of each of the insect's bodily parts.
Evo-devo offers proof that significant morphological change is both feasible and not always necessitated by significant alterations in the DNA. Gilbert (2003) and Arthur (2004) have also argued that when teaching evolution, development should be taken into consideration.
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If a hypothesis is supported consistently by different observations or experiments, it may be advanced to the level of a(n)____________.
If a hypothesis is supported consistently by different observations or experiments, it may be advanced to the level of a(n) theory.
An organism’s complexity ____ with the number of its genes; it ____ with the amount of junk dna.
An organism's complexity is directly related to the amount of junk DNA.
Most eukaryotic genomes are larger and more complex than those of prokaryotes. However, the genome size of many eukaryotes does not appear to be related to genetic complexity.
For example, the genomes of salamanders and lilies contain more than ten times the amount of DNA that is in the human genome, yet these organisms are clearly not ten times more complex than humans.
Further studies showed that in the human genome only 2.5%of the genes are coding for protein while the rest of the 97.5% of genes are non-coding genes or junk DNA.
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what does the model represent?
The cerebral cortex receives blood from the anterior, middle, and posterior ________ arteries.
The cerebral cortex receives blood from the anterior, middle, and posterior Carotid arteries.
About cerebral cortex:
Cerebral cortex controls the motor activities and reacts on the basis of sensations received through the thalamus. The cerebral cortex, which controls motor actions, receives sensations from the thalamus and responds accordingly. Essentially, the brain receives blood flow from four arteries: paired internal carotid arteries and paired vertebral arteries. At the ventral side of the pons, two vertebral arteries combine to produce the basilar artery, which then splits into the posterior cerebral arteries. The anterior and middle cerebral arteries emerge from the internal carotid artery. The arterial circle of Willis is formed by the communication between the anterior, middle, and posterior cerebral arteries.Learn more about the cerebral cortex with the help of the given link:
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Why did temujin take the name genghis khan after founding the mongol empire? he chose the name to intimidate other tribes. it was his given mongol name at birth. it was the name given to him through the mandate of heaven. he chose a name that would identify him as a universal leader.
Genghis Khan (aka Chinggis Khan) was the founder of the Mongol Empire which he ruled from 1206 until his death in 1227. Born Temujin, he acquired the title of Genghis Khan, likely meaning 'universal ruler’, after unifying the Mongol tribes. Utterly ruthless with his enemies, countless innocents were slaughtered in his campaigns of terror - millions according to medieval chroniclers.
Genghis Khan attacked the Xi Xia and Jin states and then Song China. In the other direction, his fast-moving armies invaded Persia, Afghanistan, and even Russia. Genghis Khan had a fearsome reputation but he was an able administrator who introduced writing to the Mongols, created their first law code, promoted trade and granted religious freedom by permitting all religions to be freely practised anywhere in the Mongol world. In this way, Genghis Khan built the foundations of an empire which would, under his successors, ultimately control one-fifth of the globe.
Temujin, acquired the title of Genghis Khan, likely meaning 'universal ruler’, after unifying the Mongol tribes.
Genghis Khan and the Mongol Empire:
Genghis Khan, aka Chinggis Khan, was the founder of the Mongol Empire which he ruled from 1206 until his death in 1227. Utterly ruthless with his enemies, countless innocents were slaughtered in his campaigns of terror - millions according to medieval chroniclers.Genghis Khan attacked the Xi Xia and Jin states and then Song China. In the other direction, his fast-moving armies invaded Persia, Afghanistan, and even Russia. Genghis Khan had a fearsome reputation but he was an able administrator who introduced writing to the Mongols, created their first law code, promoted trade and granted religious freedom by permitting all religions to be freely practised anywhere in the Mongol world. In this way, Genghis Khan built the foundations of an empire which would, under his successors, ultimately control one-fifth of the globe.To learn more about Genghis Khan:
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As the tide rises and the water flows towards the sea shore, the plants growing at the sea shores wilt. What process is responsible for such effect? A osmosis B diffusion C transpiration D active transport
Answer:
A. Osmosis
Explanation:
When plants are placed into a strong sugar or salt solution water will pass out of the cells by osmosis. As water passes out, the sap vacuole starts to shrink. These cells are no longer firm they are limp. We say that they are flaccid and the plant will wilt.
The process that is responsible for this effect is known as osmosis. Thus, the correct option for this question is A.
What is Osmosis?Osmosis may be defined as the process that significantly involves the movement of solute molecules from a lower concentration to a higher concentration of solution through a semipermeable membrane. It is the net movement of water across a semipermeable membrane.
It is very frequently observed that when plants are exposed to a strong sugar or salt solution, water will eventually be passed out of the cells through the process known as osmosis. As water passes out, the vacuole within the cell starts to shrink. It can be said that they are flaccid and the plant will definitely be in the process of wilting.
Therefore, the process that is responsible for this effect is known as osmosis. Thus, the correct option for this question is A.
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You are performing a endospore stain on a gram-positive bacteria and that is not endospore forming. What will this look like at the end of the stain?
performing a endospore stain on a gram-positive bacteria and that is not endospore forming. at the end of the stain it will look pink due to absence of any endospores.
Some bacteria create bacterial endospores, extremely resistant, metabolically dormant entities as a defense mechanism against unfavorable environmental conditions. Until conditions are right, the bacteria can stay in this suspended state and eventually germinate and go back to their vegetative state.By heating the bacterial emulsion, the Schaeffer-approach Fulton's forces a primary stain, malachite green, into the spore. Vegetative cells may be decolored with water since malachite green is water soluble and has a poor affinity for cellular matter. After that, safranin is used to counterstain any decolored cells. Vegetative cells will be pink and endospores will be a dark green color after staining.However due to absence of endospores, the counterstain will not produce any distinguish features and the slide would appear pink.learn more about endospore here:
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this procedure for measuring cell size has certain limitations . List three such limitations
The limitations of cell size are:
1) Surface area to volume ratio
2) Nucleo cytoplasmic ratio
3) Fragility of cell membrane
What are the cause of limitations on cell size?
The need for a surface area of sufficient area to allow the cells function→.
→If the surface area of cell increase volume increase to the cube of the linear increase.
→ Nuclie contains information needed for protein synthesis . Some cells reduce this limitation to increase the no. Of nucleus called multinucleated.
Examples are muscle cells.
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Measuring cell size has specific limitations
Exterior area to volume ratio Nucleo cytoplasmic proportion The fragility of cell membraneThe key element that limits the size of a cell is the ratio of its surface area to its volume.
What limits the sizes to which cells can grow?
One statement is that cell sizes are limited by surface-to-volume ratios. Cells that are too large in volume may be determined by the rate at which nutrients are taken up, which in turn is limited by the cell's membrane exterior area.
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If you were looking to change your work on stomata to suit your awake-at-night personality, with which plants would you choose to work?
the ability of an organ to adjust to changes in either its internal or external environments is called
Answer:
Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis (“steady state”). These changes might be in the level of glucose or calcium in blood or in external temperatures. Homeostasis means to maintain dynamic equilibrium in the body
In a fetus, the ductus arteriosus is the fetal connection between the pulmonary trunk and which structure(s)?
In a fetus, the ductus arteriosus is the fetal connection between the pulmonary trunk and the aorta.
The ductus arteriosus is a normal blood vessel that forms a connection between two main arteries i.e. the aorta and the pulmonary artery which carries blood away from the heart. The lungs are not active while a fetus is in the womb as the baby receives oxygen directly from the mother's placenta.
The fetal lungs are filled with amniotic fluid hence, they cannot be used to oxygenate the blood. Also, the arterioles in the lungs are constricted, which limits the amount of blood that can pass through the pulmonary system.
As the fetal blood leaving the placenta is already rich in oxygen and the lungs are non-functional, thereby, the ductus arteriosus permits a part of this blood to detour the pulmonary circulation to enter directly into the systemic circulation.
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In the dna isolation process, ________ is used to break down the protein complexes and allow the dna molecules to easily precipitate.
In the DNA isolation process, ice cold 95% ethanol is used to break down the protein complexes and allow the DNA molecules to easily precipitate.
What is separation and isolation of DNA fragments?
The cutting of DNA by restriction endonucleases results in the fragments of DNA. These fragments can be separated by a technique known as gel electrophoresis. Since, DNA fragments are negatively charged molecules they can be separated by forcing them to move towards the anode under an electric field through a medium/matrix. The most commonly used matrix is agarose which is a natural polymer extracted from sea weeds. The DNA fragments separate (resolve) according to their size through sieving effect provided by the agarose gel. Hence, the smaller the fragment size, the farther it moves.The separated DNA fragments can be visualised only after staining the DNA with a compound known as ethidium bromide followed by exposure to UV radiation (you cannot see pure DNA fragments in the visible light and without staining). We can see bright orange coloured bands of DNA in a ethidium bromide stained gel exposed to UV light. The separated bands of DNA are cut out from the agarose gel and extracted from the gel piece. This step is known as elution. The DNA fragments purified in this way are used in constructing recombinant DNA by joining them with cloning vectors.To learn more about DNA isolation process: https://brainly.com/question/18316109
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Once glycogen stores are replenished, what role does the remaining oxidized glucose fill?
Answer:
d
Explanation:
two most important environmental factors affecting animals
The two most important environmental factors are biotic and abiotic factors affecting animals.
what are the difference between abiotic and biotic factor ?Biotic factors are living beings of an ecosystem where as abiotic factors are non-living like physical and chemical agents in the ecosystem.
Biotic factor dependent on abiotic factor, but abiotic factor are independent.
Biotic factor affects the biome, individual species, population biosphere,, where as abiotic factor affects species, their population, community, ecosystem, and biosphere.
Biotic factor are plants, animals, bacteria, algae where as abiotic factors are soil, topography, climate of an ecosystem.
Biotic factor is subjective but abiotic factor is objective.
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A porcupine has an internal skeleton and a rose has a stem. Write a sentence to explain how these physical structures have different functions.
Answer:
The sentence that explained the physical structures have different functions is like it generated the new living tissue and fluid transportation.
Usage of an internal skeleton?
Since A porcupine has an internal skeleton and a rose has a stem.
So here the internal skeleton should be used for helping out an organism for holding the body up and kept from falling.
On the other hand, the stem should stored the nutrients and generated the new living tissue and fluid transportation.
The Internal skeleton of the porcupine gives shape and structure to the porcupine.
The stem of the rose plant provides support to the plant and serves to transport nutrient and water in the plant.
What a skeleton?A skeleton is a rigid structure found in living organisms which provide structure and shape to the living organism.
Skeletons are found in animals.
Skeletons present in animals are of two types:
Internal skeletons also known as endoskeletonsexternal skeletons also known as endoskeletonsThe Internal skeleton of the porcupine gives shape and structure to the porcupine. It also serves as a point of attachment to muscles in order to enable movement.
Stems are present in plants.
Stems serve various purposes in plants such as:
transport of nutrients and water storage of food and waterprovides support and structure to the plant.Thus, the stem of the rose plant provides support to the plant and serves to transport nutrient and water in the plant.
In conclusion, the internal skeleton of animals and the stem of plants both provide shape and structure to the respective organisms.
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Directions
Task 1: Biologist Responsibilities
Research one or more of the following biology-related job fields: Field Biologist, Senior Biologist,
Conservation Biologist, Conservation Scientist, or Evolutionary Ecologist. Find a sample resume
within that field and identify some key skill sets that resume has. Are these skills that you feel you
already possess? Or would you need to grow some of these skills? Be sure to upload the
sample resume to the dropbox.
Type your response here:
The sample resume of a Senior Biologist is given in the pdf attached.
What are the skill sets that resume has?They includes:
MicrobiologyProject Management BacteriologyCell Culture Study Collaboration.Are these skills that you feel you already possess?Among the options of the skills, the ones that i possess are:
Project Management Study Collaboration.Would you need to grow some of these skills?Yes i would need to grow some of the skills such Bacteriology and Cell Culture. I know the foundation of the course but not too in-depth so I need to grow those skills.
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What are the steps that lead to increased excitability in a neuron when ne is released presynaptically?
What are the steps that lead to increased excitability in a neuron when ne is released presynaptically? G-protein in the membrane is activated when the NE receptor is attached to a receptor.
What is excitability in a neuron?The action potential serves as the foundation for a neuron's excitability, or its capacity to produce a significant, fast shift in membrane voltage in response to a very minor input. The loss of the negative transmembrane potential due to an inward current of positive charges is caused by the action potential, which typically progresses to a positive transmembrane potential before swiftly repolarizing back to a negative transmembrane potential.
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The therapist noted that the muscles on the right side of omar’s body were smaller than those on the left side. what is this condition called?
The muscles on the right side of Omar's body were smaller than those on the left side due to Hemihypertrophy.
A hereditary condition known as hemihypertrophy causes a person's body to expand excessively on one side compared to the other. Because of continuing bone or soft tissue growth, one side of the body grows more quickly than the other. Everyone who is affected can have a different appearance, and youngsters frequently have it. One area of the body, like the legs, may be unaffected by the overgrowth. However, it might also affect the mouth, face, and limbs, among other body parts. Although the gene that causes hemihypertrophy isn't always known, it can be passed on from parents to children. Hemihypertrophy is frequently connected to chromosome 11 mutations in Beckwith-Wiedemann syndrome.
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Mice with a gain-of-function mutation in the agouti gene will have fur that has a(n)_____color.
The afferent arteriole is _____ in diameter than the different arteriole, so that glomerular _____ is relatively high.
The afferent arteriole is larger in diameter than the different arteriole, so that glomerular blood pressure is relatively high.
The afferent arterioles are a group of blood vessels that supply the nephrons in many excretory systems. They play an important role in the regulation of blood pressure as a part of the tubuloglomerular feedback mechanism.
The afferent arterioles branch from the renal artery, which supplies blood to the kidneys. The afferent arterioles later diverge into the capillaries of the glomerulus.
The glomerulus (plural glomeruli) is a network of small blood vessels (capillaries) known as a tuft, located at the beginning of a nephron in the kidney. Each of the two kidneys contains about one million nephrons.
The tuft is structurally supported by the mesangium (the space between the blood vessels), composed of intraglomerular mesangial cells. The blood is filtered across the capillary walls of this tuft through the glomerular filtration barrier, which yields its filtrate of water and soluble substances to a cup-like sac known as Bowman's capsule. The filtrate then enters the renal tubule of the nephron.
The glomerulus receives its blood supply from an afferent arteriole of the renal arterial circulation. Unlike most capillary beds, the glomerular capillaries exit into efferent arterioles rather than venules. The resistance of the efferent arterioles causes sufficient hydrostatic pressure within the glomerulus to provide the force for ultrafiltration.
The glomerulus and its surrounding Bowman's capsule constitute a renal corpuscle, the basic filtration unit of the kidney. The rate at which blood is filtered through all of the glomeruli, and thus the measure of the overall kidney function, is the glomerular filtration rate.
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Recent work by taxonomists at the world register of marine species has eliminated how many previously listed species because they were duplicate identities?
Recent work by taxonomists at the world register of marine species has eliminated between 1,50,000 and 2,00,000 previously listed species because they were duplicate identities.
228,445 marine organisms have been identified, according to taxonomists who have taken on the challenging mission of cataloging every species in the ocean.
190,400 i.e. between 1,50,000 and 2,00,000 previously listed species were removed by the World Register of Marine Species (WoRMS) staff because they were duplicates.
A biologist who classifies creatures is a taxonomist.
For instance, a plant taxonomist could research the origins and connections between various rose varieties, whereas an insect taxonomist might concentrate on the connections between various beetle varieties.
The plants, animals, and other species that exist in salt water found in the sea, ocean, or brackish water found in coastal estuaries are referred to as marine life, sea life, or ocean life. Marine life has a fundamental impact on the planet's nature.
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The water stored in the open spaces within underground rocks and unconsolidated material is called:_________
The water stored in the open spaces within underground rocks and unconsolidated material is called groundwater.It found underground in the cracks and space in soil, sand and rocks.
The word groundwater or underground water is used to express the area. It means aquifer although this term is usually used to described water - bearing formation capable of yielding enough water to supply people uses.
Groundwater is the stored water and moves slowly through high permeable membrane rocks called aquifers. Water that travels down from the soil surface to underground and collected in the space between sediments and the rocks, which filled the empty space and this is called as saturated zone.
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Every year _______ species go extinct. a. 3 b. 72 c. 1000 d. 20000 please select the best answer from the choices provided
The experts calculate that between 0.01 and 0.1% of all species will become extinct each year. If the low estimate of the number of species out there is true - i.e. that there are around 2 million different species on our planet - then that means between 200 and 2,000 extinctions occur every year.
What is extinction?
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and recover may have been lost before this point. Because a species' potential range may be very large, determining this moment is difficult, and is usually done retrospectively. This difficulty leads to phenomena such as Lazarus taxa, where a species presumed extinct abruptly "reappears" (typically in the fossil record) after a period of apparent absence.More than 99% of all species that ever lived on Earth, amounting to over five billion species, are estimated to have died out. It is estimated that there are currently around 8.7 million species of eukaryote globally, and possibly many times more if microorganisms, like bacteria, are included. Notable extinct animal species include non-avian dinosaurs, saber-toothed cats, dodos, mammoths, ground sloths, thylacines, trilobites and golden toads.Through evolution, species arise through the process of speciation—where new varieties of organisms arise and thrive when they are able to find and exploit an ecological niche and species become extinct when they are no longer able to survive in changing conditions or against superior competition. The relationship between animals and their ecological niches has been firmly established. A typical species becomes extinct within 10 million years of its first appearance, although some species, called living fossils, survive with little to no morphological change for hundreds of millions of years.To learn more about extinction: https://brainly.com/question/14482178
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The ________ returns most of the venous blood from the heart to the right atrium.
The superior vena cava returns most of the venous blood from the heart to the right atrium.
The whole return of systemic venous blood goes to the right atrium. Either the inferior vena cava or the superior vena cava receives the majority of the blood. The superior vena cava receives systemic venous circulation, which includes blood from the head, neck, chest, shoulders, and upper limbs, from above an imaginary line drawn at the level of the diaphragm.
Most of the body above the diaphragm is drained via the superior vena cava. The axillary vein, which originates in the axillary area, goes through the body wall to produce the subclavian vein on both the left and right sides. The brachiocephalic vein is created when it unites with the external and internal jugular veins of the head and neck.
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Cell division is regulated by two major genes..
division.
A. proto-oncogenes, oncogenes
B. tumor suppressor genes, proto-oncogenes
C. proto-oncogenes, tumor suppressor genes
D. oncogenes, tumor suppressor genes
stimulate cell division and
inhibits cell
Cell division is regulated by two major genes D. oncogenes, and tumor suppressor genes, which stimulate cell division and, inhibit cells.
Cell division is the technique by the way which a parent cell divides, whilst a mother cell divides into or greater daughter cells. cellular department commonly takes vicinity as a part of a bigger cell cycle. In eukaryotes, there are distinct sorts of cell division that take place.
Cell division is the manner wherein a parent cell divides, giving a push to 2 or greater daughter cells. it is a crucial biological method in every lifestyle. cell division is fundamental to all residing organisms and required for increase and improvement. As a crucial approach to reproduction for all dwelling matters, the cell department allows organisms to switch their genetic fabric to their offspring.
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Easy! Please Help! A man is walking through the woods with his dog. Suddenly, a tree limb falls in his path and he leaps out of the way to avoid it. Then the man's dog gets loose, and he ends up chasing it through the woods for a minute or two before he manages to catch it.
a) Describe the function of the respiratory system in this situation.
b) Describe the function of the endocrine system in this situation.
c) Describe the function of the nervous system in this situation.
d) Describe two ways that any of the man's body systems worked together in this situation.
The answers include the following:
The respiratory system gave the cells more oxygen via breathing to perform various activities.The endocrine system released hormones such as adrenaline to activate chemical changes and stay alert.The nervous system carried electrical impulses necessary for the contraction and relaxation of muscles.The bones and muscles worked together to ensure adequate movement.What is Musculoskeletal system?This is the system which comprises of bones, ligaments etc and ensure that the body system has a rigid structure.
It also ensures organisms are able to move from one place to another in search of food and for their survival.
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Respectively, what substances in dark greens and grains are tightly bound to iron and limit its absorption into the body?
Answer:
oxlic acid
Explanation:
I hope this help
Cells will usually divide if they receive the proper signal at a checkpoint in which phase of the cell cycle?
Answer:
M phase
Explanation:
While there are many checkpoints within the cell cycle, the specific checkpoint you are referring to most likely takes place in the M (mitosis) phase.
Before the M phase (which includes the G1, S, and G2 phases), the cell grows, the number of organelles increases, and DNA replicates. After the G2 phase, the M phase begins. At the beginning of this phase, the DNA condenses, lines up in the center of the cell, attaches to spindle fibers, and is pulled to opposite ends of the cell. If this checkpoint receives the proper signal, the actual division of the cell will occur.
What is the procedure of voter identification intended to help prevent fraudulent voting and keep the process organized?
Registration is the process of voter identification intended to help to prevent fraudulent voting and keep the procedure organized. It is helpful in case of fraudulent votes.
Registration is the process of knowing the identity of the voter. it is helpful in preventing fraudulent votes. It helps in knowing that the person from that country and also a genuine person.
Purge is simply the process of reviewing the lists of registered voters and removing the name of the persons who are no longer available or eligible.
In the election system, there is a need for Voter list maintenance in which names of the persons of the country are available.
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