The limit of change resulted from the regeneration process is very clear in option B: Planaria
Has Planaria the ability to regenerate?Most fishes and salamanders have limited limb regeneration, while larval frogs and toads have tail regeneration (but not adults). After being amputated, a salamander's or a triton's entire limb will continue to develop.
Therefore, Planarians are flatworms (phylum Platyhelminthes) that live in freshwater bodies, and their capacity for regeneration has long been known (Pallas, 1766; Dalyell, 1814). In a procedure that takes days to weeks, planarians can regenerate new heads, tails, sides, or even complete organisms from tiny body parts.
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why are humans less genetically variable than other organisms despite the fact that we range all over the world?
The human species has experienced a quick increase in size which leads to less genetic variability in humans as compared to another organism.
Native populations' genetic variety declines when they migrate further away from Africa, and bottlenecks during migration, which are situations where population size is momentarily reduced, are assumed to be the cause of this.
Evolutionary geneticists have now demonstrated that during two severe bottlenecks that occurred between 60,000 and 50,000 years ago as modern humans left Africa, a significant portion of our ancestors' genetic variation was lost.
The presence of more than two homologous chromosomes, polyploidy, population migration, homologous recombination or crossing over during meiosis, and mutations are a few potential causes of genetic variability in the population.
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the p plants that mendel used in his experiments were all homozygous for the trait he was observing. which genotypes could correctly represent the alleles of the p plants?
The correct genotypes of the plants are YY and yy. Since both the plants are homozygous.
In terms of genetics, being homozygous means having inherited the same alleles (versions) of a genomic marker from both biological parents. A person who possesses two identical copies of a genetic marker is said to be homozygous for that marker. In contrast, a person who has two copies of a certain marker is said to be heterozygous.
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The genotype YY or yy would correctly represent the alleles of the p plants.
The genotype YY or yy would correctly represent the alleles of the p plants. Since both the plants are homozygous. Each letter represents one of the two alleles in the genotype. The dominant allele is capitalized and the recessive allele is lowercase.
The letter used for the gene (seed color in this case) is usually related to the dominant trait (yellow allele, in this case, or “Y”). When P plants with contrasting traits were cross-fertilized, all of the offspring were heterozygous for the contrasting trait, meaning their genotype had different alleles for the gene being examined. For example, the F1 yellow plants that received a Y allele from their yellow parent and a y allele from their green parent had the genotype Yy.
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protozoal (parasitic) infection associated with aids that may cause pneumonitis, hepatitis, and encephalitis: a.kaposi sarcoma b.toxoplasmosis c.pneumocystis jiroveci (formerly carinii) pneumonia d.cryptococcus e.herpes simplex
protozoal (parasitic) infection associated with aids that may cause pneumonitis, hepatitis, and encephalitis: b.toxoplasmosis
What causes pneumonia most frequently in AIDS patients?One of the most frequent and potentially fatal causes of pneumonia in patients with HIV is an infection with the bacterium Streptococcus pneumoniae, often known as Pneumococcus. For protection against Streptococcus pneumoniae infection, people with HIV should receive a vaccination.
Immune system dysfunction is the primary cause of fungus infection (either local immunity over the skin or mucous membranes or systemic immunity as seen in the case of certain conditions such as diabetes ).
The most frequent cause of encephalitis is the herpes simplex virus, which also causes cold sores, varicella zoster virus, which causes chickenpox and shingles, measles, mumps, and rubella viruses, and encephalitis.
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1. based on what you know about the abiotic factors most strongly influencing the marine realm, why is the process of ocean upwelling shown above so important for marine ecosystems?
Coastal upwelling promotes the growth of plankton and seaweed because the deep water pushed to the top is frequently nutrient-rich. Fish, marine animals, and birds can then eat these, in turn. Some of the world's most fertile ecosystems are produced by upwelling.
The kinds of flora and animal species that can survive in an aquatic environment are determined by a number of abiotic conditions. The amount of sunshine, the temperature, the depth of the water, and the chemical makeup of the water all have a significant impact on aquatic ecosystems, whether they are freshwater or saltwater.Oceanic mass movements known as upwelling and downwelling have an impact on both surface and deep currents. The water must be stirred, oxygen must be sent to the deep ocean, heat must be distributed, and nutrients must be brought to the surface.To know more about marine animals
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studies of rough-skinned newts have documented their ability to produce toxins in defense against a predator attack. the common garter snake, a predator of rough-skinned newts, exhibits a resistance to the toxin produced by the newt. in response, newts have been observed to produce increasingly potent toxins, which in turn results in selection for snakes with even greater resistance to the toxin. what phrase best describes this interaction between rough-skinned newts and garter snakes? group of answer choices host-parasite coevolution obligate mutualism evolutionary arms race diffuse coevolution
Evolutionary arms race best describes the interaction between rough-skinned newts which have the ability to produce toxins against their predator garter snakes.
What is an evolutionary arms race?
It is an ongoing struggle between competing sets of co-evolving genes, and phenotypic and behavioral traits that develop escalating adaptations and counter-adaptations against each other.
One example is the arms race between bats and moths. In this, the weaponry used by each is largely based on sound and hearing.
In the above case, rough-skinned newts are compared to the host and the common garter snake is compared to a parasite. Rough-skinned newts produce toxins in defense against a predator (common garter snake). This predator exhibits resistance to the toxin produced by the newt. in this way, if the newt increased potent toxins then a common garter snake too increases its resistance to the toxin. Common garter snakes exhibit an evolutionary arms race by evolving rough-skinned newts.
Let us discuss other options
Mutualism is a relationship between two organisms each benefiting from the relationship.Host-parasite coevolution is a special case of coevolution where a host and a parasite continually adapt to each other.Diffuse coevolution also called guild coevolution where whole groups of species interact with other groups of species leading to changes that cannot really be identified.Hence rough-skinned newts and common garter snakes exhibit an evolutionary arms race.
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Which type of rock made from heat and pressure is primarily classified by texture and composition?
Responses:
A)sedimentary
B)igneous
C)organic
D)metamorphic
Answer: Metamorphic
Explanation:
Answer:
metamorphic
Explanation:
it was correct on test
Which statement best represents the process through which evolution occurs?
Responses
Answer:
Theory of evolution states that the organisms which are fit will survive and they will be able to increase their generations
Compared to human cells, there are about _______ bacterial and archaeal cells inhabiting our bodies.
Answer:
Compared to human cells, there are about _ 10 to 100 times as many______ bacterial and archaeal cells inhabiting our bodies.
Explanation:
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The ______ of a synovial joint encloses the joint and prevents bone ends from being pulled apart.
The Joint capsule of a synovial joint encloses the joint and prevents bone ends from being pulled apart.
The joints of the limbs and other bones that rub up against one another are examples of synovial joints (e.g. shoulder, hip, elbow and knee). It has a fluid-filled joint cavity as a defining characteristic.
The ends of the bones are covered in slick cartilage in a synovial joint. A synovial membrane-lined joint capsule that produces synovial fluid surrounds and protects the two of them. The fluid, muscles, and connective tissues are shielded by the capsule.
The synovial joint's interior is enclosed by the joint capsule, which resembles a sac-like membrane. The bone ends of each involved bone have specific attachment zones where the joint capsule, which is a dense fibrous connective tissue, is attached.
Hence when the bone is pulled apart this joint capsule protects the joint.
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sea turtles reproduce by laying clutches of eggs in the sand and will often return to the same beach where they hatched to lay their eggs. this is an example of a behavior called philopatry. by laying eggs to reproduce, sea turtles are considered...
By laying eggs to reproduce, sea turtles are considered to be Oviparous.
An oviparous creature is one that produces eggs, and the youthful hatch after being ousted from the body. Whereas fertilization of the egg can happen inside or remotely, oviparous creatures continuously hatch the youthful outside of their body. Numerous creatures of land and water, winged creatures, fish, and reptiles are oviparous and regularly make homes to secure their eggs. This could be differentiated from ovoviviparous creatures, which hatch eggs interior of their bodies, at that point remove live young. This will be seen in a few sharks, snakes, and other animals. Being oviparous is a developmental procedure for generations. In this strategy, one or numerous eggs can be delivered. Each egg could be a gamete that has the female’s commitment to the hereditary material. In numerous species, the male supplies his gamete in the shape of sperm, which must discover its way to the egg. Once fertilized, the cells inside the egg will start to subdivide as a fetus is shaped
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an organism's genomic dna is analyzed and found to contain 22% thymine. what percentage of that organism's dna is guanine? group of answer choices 22% 56% 28%
The organism has 28% Guanine In its DNA.
In DNA the amount of thymine = amount of adenine
Thus A + T = 22% +22% = 44%
Rest of the DNA is made of Guanine and Cytosine
Thus G + T = 100 + 44 = 56 %
Since amount of Guanine = amount of Cytosine
Thus amount of Guanine = 56 % / 2 = 28%.
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A protein that is found in the Golgi apparatus was synthesized:
a. in the nucleus.
b. on ribosomes located in the smooth ER.
c. on ribosomes bound to the rough ER.
d. on ribosomes located in the chloroplast.
e. on ribosomes located in the cytoplasm..
The Golgi apparatus processes and sorts proteins from the ER for transport to lysosomes, the plasma membrane, or secretion. Therefore, option (C) is correct.
What are golgi apparatus?Proteins obtained from the ER are further processed and sorted in the Golgi apparatus, or Golgi complex, where they are eventually transported to lysosomes, the plasma membrane, or secretion. As was already mentioned, the Golgi also produces sphingomyelin and glycolipids.
The flattened cisternae and related vesicles make up the Golgi apparatus. The Golgi apparatus' cis face is where proteins and lipids from the ER enter, and its trans face is where they leave.
The transport, sorting, and modification of both protein and lipid are the three main tasks performed by the Golgi apparatus, and these tasks are reflected in the protein makeup of the organelle.
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if plant cells have a cell wall, then they cannot exchange material through their plasma membrane. true or false. why?
The given statement is false because the plants mediate the exchange of materials through plasma membrane which then reach into a different cell through the spaces between cell wall called plasmodesmata.
Plasma membrane is a bilayer of lipid that is selectively permeable in nature. Apart from lipids the plasma membrane is composed of proteins, carbohydrates and also cholesterol/. The plasma membrane has a semi-fluid nature.
Plasmodesmata are the small space present in between the cell wall through which the exchange of materials, cytoplasm, etc. takes place. Thus, plasmodesmata mediate the communication in plant cells. The materials inside the plant cell first cross the selectively permeable membrane and then pass through the plasmodesmata.
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what organelles constitute the endombrane system? how vesicles of the endomenbrane system get transported (by which cytoskeleton)? what are the motor proteins involved?
The plasma membrane, lysosomes, Golgi apparatus, endoplasmic reticulum, and vacuoles.
How does the endomembrane system move its vesicles?Vesicles pinch out from the ER, Golgi, and other membranous organelles, bringing with them any soluble molecules present in the fluid contained as well as any molecules present in that particular region of the membrane.
Microtubules are vesicles carried by?There are two different ways that vesicles are moved along microtubules.
Membrane vesicles are then used to transport the majority of proteins to the Golgi apparatus. Mechanochemical cycles of filament binding, conformational change, filament release, conformation reversal, and filament rebinding are used by motor proteins to move along the cytoskeleton.
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the bicuspid (mitral) valve question 6 options: is the location of the pacemaker cells of a normal heart. prevents blood flow from the right ventricle to the right atrium. prevents blood flow from the left ventricle to the left atrium. prevents blood flow from the pulmonary artery to the right ventricle. prevents blood flow from the aorta to the left ventricle.
One of the four heart valves is the mitral valve, commonly referred to as the bicuspid valve or the left atrioventricular valve. It is located between the left atrium and the left ventricle of the heart and has two cusps or flaps.
An aortic valve that has two cusps (or flaps) as opposed to three is referred to as bicuspid. The primary artery supplying blood to your body, the aorta, is controlled by the aortic valve, which regulates blood flow from the left ventricle (chamber).
Divides the bottom left chamber from the left atrium, which is the upper left chamber (left ventricle). permits blood to move from the left atrium to the left ventricle through opening. prevents blood from returning to the left atrium from the left ventricle.
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homoserine is: a) a precursor of both methionine and threonine. b) a precursor of serine. c) derived from homocysteine. d) derived from serine. e) derived from threonine
Homoserine is considered to be a precursor of both methionine and threonine.
So, the correct option is A.
Homoserine, or its lactone form, is produced when cyanogen bromide cleaves a peptide caused by methionine breakdown. Methionine, threonine, an isomer of homoserine, and isoleucine are the three necessary amino acids that are produced during the production of homoserine. Homoserine, a precursor of threonine and methionine, inhibits the activity of glutamate dehydrogenase, an enzyme that catalyzes the first process in the absorption of ammonia. This impact is supported by physiological and biochemical data.
Methionine, threonine, an isomer of homoserine, and isoleucine are the three necessary amino acids that are produced during the production of homoserine. Glycolysis, tricarboxylic acid (TCA), and the citric acid cycle are all components of the whole metabolic route.
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what is the effect of mean arterial pressure in the presence of norepinephrine, vasopressin, or angiotensin ii?
Mean arterial pressure (MAP) is the average arterial pressure throughout one cardiac cycle, systole and diastole.
What is Norepinephrine ?Norepinephrine is secreted by adrenal gland. When amount of norepinephrine is increased MAP also increases. When amount of norepinephrine is decreased MAP also decreases.
Vasopressin is secreted by the posterior pituitary gland. It is released when arterial pressure decreases and there is reduction in cardiac volume. It increases systemic vascular resistance and MAP and reduces heart rate and mean pulmonary arterial pressure in patients.
Angiotensin II is secreted by adrenal gland. Receptor of angiotensin ii helps in increasing MAP which is very important in regulating MAP after birth
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some flagellated species fail to produce flagella when grown under labortory conditions. what might be the disncetive
Bacteria will not move if they do not have to in order to collect nutrients because they are in favourable conditions, therefore even though the can contains these bacteria, they would not produce flagella.
When favourable circumstances are present, organisms have a tendency to preserve energy and refocus it on reproduction rather than on activities that are no longer necessary given the circumstances. The same holds true for bacteria growing in culture because food is easily available and bacteria no longer need to develop flagella in order to move in order to capture it thus they try to conserve their energy and refocus it on reproduction.
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what are the four major groups of mollusks? give examples of each group. which one is distinctly different than the others?
Mollusca is the second-largest animal phylum.
Lives in all freshwater and marine environments.
examples - clams, snails, slugs, and squid.
General features of Mollusca -
1. body has 3 parts- head, foot and visceral mass
2. unsegmented body
3. radula for rasping
4. mantle for shell secretions
5. have larva ( marine forms) - trochophore.
The 4 classes of Mollusca are-
1. Polyplacophora
they are elongate or oval, dorsoventrally flattened, bilaterally symmetrical, marine.
mantle-edge stiffened (called the girdle)
e.g. - chitons, limpets.
2. Gastropoda
muscular foot which is used for "creeping" locomotion
largest group in Mollusca
shell is spiral in shape
e.g.- Haliotis, Pila
3. Bivalvia
Animal with soft body which is protected by a limestone shell.
e.g. - scallops (Pectinidae), oysters (Ostraeidae), pearl oysters
4. Cephalopoda
Are molluscs with large heads, large eyes with grasping tentacles
e.g. - squid, cuttlefish,octopus etc.
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Explore It! Question #4: Look around you. Describe how you could use an
object in the room to simulate the motion of this type of wave.
Your answer
Answer:
A longitudinal wave can be created in a slinky if the slinky is stretched out in a horizontal direction and the first coils of the slinky are vibrated horizontally. In such a case, each individual coil of the medium is set into vibrational motion in directions parallel to the direction that the energy is transported.
Explanation:
Oxygen is important in the oxidation of glucose because it ____________________________.
Answer:
Oxygen is important in the oxidation of glucose because it is highly electronegative.
Explanation:
what ancient society we studied in this class produced stamp seals with images of animals like water buffaloes, tigers, and elephants, accompanied with glyphs that have never been deciphered?
Pashupati Seal of Harappan civilization from Mohenjo Daro produced stamp seals with images of animals like water buffaloes, tigers, and elephants.
A seal is a tiny, portable artifact that can be fashioned of a variety of materials, including stone, metal, bone or ivory, and various synthetic pastes.
The Pashupati Seal of the Harappan civilization from Mohenjo Daro is the most well-known seal. A seal-shaped figure is in the center, sitting cross-legged, surrounded by various animals, including an elephant, a tiger, a rhino, and a buffalo to its right.
Commercial uses for these seals included making clay tags for sacks that carried goods to various locations and sealing the mouths of jars by pressing the seals against soft clays. These seals were also employed in trading activities.
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how does the protozoan trypanosoma evade detection by the immune system? how does the protozoan trypanosoma evade detection by the immune system? it can change the surface antigens frequently, preventing the immune system from tracking it. it can resist oxidation inside macrophages. it produces a capsule which is composed of polysaccharides similar to those found in the host. it prevents phagosome-lysosome fusion.
Protozoan trypanosome evades detection by frequently changing the surface antigens, thereby preventing the immune system from tracking it.
What are Protozoan trypanosoma?
Typanosomoa belong to the genus kinetoplastids, class trypanosomatidae. They are a group of monophyletic single celled parasitic flagellate organisms(protozoa). They infect the blood of vertebrates (even humans), which is usually transmitted by insect bites. They include some that might cause serious diseases, like sleeping sickness and chagas disease.
Symptoms caused by this protozoa include fever, irritability, headaches, swollen lymph nodes, aching muscles/ joints and even extreme fatigue. These symptoms are common for the sleeping sickness which is also called African Trypanosomiasis. This sickness is caused by the species Trypanosoma brucei, which is usually transmitted by the tsete fly, found only in the sub-Saharan Africa.
A species of the protozoa called Trypanosoma culicavium also infects birds and mosquitoes.
Prolonged infections are possible by this protozoan because it goes through antigenic variation, which is how the parasite is able to evade the antibody mediated elimination.
Hence, the protozoan trypanosoma evades detection by frequently changing the surface antigens.
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bacterial colonies can be transferred from a master plate to secondary plates in the same configuration using a transferring agent such as a sterile velvet cloth. this technique is known as .
Bacterial colonies can be transferred from a master plate to secondary plates in the same configuration using a transferring agent such as a sterile velvet cloth this technique is known as replica plating .
Replica plating is the technique by which each colony is inoculated onto another plate according to a numbered pattern. replica plating allows each clone to be tested different variety of methods, while a master plate is always reserved to pick the clones .
Replica plating saves time and labor of lab technician and helps them to work of larger population of bacterial colonies by using isolation method .
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Alicia conducted an experiment to find out which insulating material holds in the most heat. She did multiple trials of each test and recorded observations of each trial.
Why did Alicia most likely do more than one trial? Check all that apply.
to increase the reliability of her data
to provide a better understanding of the concepts she investigated
to prevent other people from using the data incorrectly
to help in arriving at a conclusion even with inaccurate data
to reduce the likelihood of errors in the experiment
To lessen the chance that the experiment may make mistakes in the insulating material experiment.
Although more costly, aerogel is unquestionably the greatest insulating material. Fiberglass is inexpensive but needs to be handled carefullyin the experiment. Although useful, mineral wool is not fire resistant material. Efficacious, eco-friendly, and fire-resistant cellulose is difficult to apply. Wool, especially Icelandic wool, is warmer than polyester and cotton according to science. The greatest sportswear for keeping warm when training in the cold is spandex, followed closely by gore-tex. The best fabric for keeping you warm is a wool-acrylic combination, followed by cotton-acrylic. Due to the experiment may make mistakes great thermal resistance as one of the insulation materials, urethane foam is frequently used in home building. It can be produced as a spraying or in other forms.
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Which term applies to an individual who possesses two recessive alleles for the same trait? Choose the correct answer.
mutated
O haploid for the trait
O homozygous for the trait
heterozygous for the trait
The term applies to an individual who possesses two recessive alleles for the same trait and is homozygous for the trait. Option B.
The genotype is formed by the combination of alleles that an organism has. If the paired alleles are the same, the organism's genotype is said to be homozygous for that trait, and if they differ the organism's genotype is said to be heterozygous. Homozygosity also refers to a genotype consisting of two identical alleles of a gene for a particular trait. An individual can be homozygous dominant or homozygous recessive.
In complete dominance, only one allele of the genotype is present in the phenotype. In codominant cases, both alleles of a genotype are present in the phenotype. In the case of imperfect dominance, the phenotype shows a mixture of genotypic alleles. Homozygous and heterozygous are terms used to describe a pair of alleles. Individuals who have two identical alleles are said to be homozygous. Individual organisms with different alleles are said to be heterozygous.
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100 points Help please
Answer:
c) Evolved first
Explanation:
The characteristic of prokaryotic cells is that they evolved first. Eukaryotic cells started to form after the evolution of prokaryotes. Hence, the option (c) is correct.
Concept of artificial ecosystems
Hello..!
They are created with the intervention of the human being and can be modified at any time
Example:
Urban ecosystems; The gardensAgricultural ecosystems; the orchardsWhy is sucrose not a used sugar
contraction of which muscle normally accounts for around 75% of the air movement in normal quiet breathing?
The contraction of diaphragm normally account for around 75% of the air movement in normal quiet breathing.
This outward push is increased by the inspiratory muscles (mainly the diaphragm and external intercostals) during inspiration. This causes the lung tissue to expand and air to enter the alveoli at a rate regulated by airway resistance.
The so-called "silent" expiration is caused by the elastic recoil of the lung parenchyma, which causes these inspiratory muscles to relax and the lung to regain its equilibrium volume.
However, in forced expiration, the abdominal and internal intercostal muscles are employed to exert more force against the lungs, causing them to expel air more quickly and allowing expiration down to the residual volume (RV).
Lung function testing is performed to quantify these changes. In lung disease, these forces are altered.
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