BSL-1, BSL-2, BSL-3, and BSL-4 are the four biosafety levels, with BSL-4 being the greatest level of confinement. Animal research (ABSL), agricultural research (BSL-Ag), and other forms of research have extra requirements and designations.
What are biosafety levels?BSL-1 to BSL-4 are the biosafety levels. Each biosafety level expands on the regulations of the previous level.
Regardless of biosafety level, every microbiology laboratory adheres to conventional microbiological protocols.
BSL-1, BSL-2, BSL-3, and BSL-4 are the four biosafety levels, with BSL-4 being the greatest (maximum) level of confinement.
Animal research (ABSL), agricultural research (BSL-Ag), and other forms of research have extra requirements and designations.
Thus, these are the four biosafety levels as per the asked question.
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Poison dart frogs live in the rainforest. They produce a poison by eating toxic fire ants. The only known predator is a snake, liophis epinephelus. Which is most likely a density-independent factor that affects the poison dart population in the rainforest?.
Clear cutting the rainforest is most likely a density-independent factor that affects the poison dart population in the rainforest.
What is Population?The population may be defined as the members of the same species living in a particular area at a given time.
The complete question is as follows:
clear-cutting the rainforest limited food source susceptibility to disease increase in the population of Liophis Epinephelus.Density-independent factors of a population may be defined as a factor that restricts the size of a population irrespective of the density of the population.
Here, the clear-cutting of rainforests illustrates the automated collapse of the habitat of the poison dart frog's population, irrespective of their population size.
Therefore, the correct option for this question is A.
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Answer:
A. clear cutting the rainforest
Explanation:
A substance with a pH of 1 would be classified as a(n)
A pH of exactly 7 is neutral. The higher the [H+], the lower the pH. Figure 4. The pH scale shows that substances with a pH greater than 7 are basic and a pH less than 7 are acidic.
After seeing how few units of energy there is for the trophic levels above. Why are there usually so few organisms at the top level of a pyramid of energy?
Energy declines as one climbs up the food chain because energy is wasted as metabolic heat when animals from one trophic level are devoured by species from the next. This causes the presence of only a few organisms at the top level of energy pyramid.
What is ecological pyramid?A graphical representation of the biomass at each trophic level in the given environment is known as an ecological pyramid.
Energy declines as one climbs up the food chain because energy is wasted as metabolic heat when animals from one trophic level are devoured by species from the next.
Thus, this causes the presence of only a few organisms at the top level of energy pyramid.
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All of the following are possible causes of preeclampsia except __________.
A.
genes
B.
stress
C.
low birth weight
D.
autoimmune disorders
Liquid matter will take the shape of any container it is put in.
True
False
Answer:
True
Explanation:
Liquid matter will take the shape of any container it is put in - True
Explanation:
A liquid has no definite shape and takes a shape dictated by its container.
What connects the
nitrogenous bases to each
other?
A. oxygen bonds
B. hydrogen bonds
C. sugar bonds
D. phosphate bonds
I need help on the question in blue I don’t understand it is someone can help me I would highly appreciate it:)
Answer:
TTAGCCATG
Explanation:
Adenine pairs with Thymine
Guanine pairs with Cytosine
Hope this helps!!
A farmer is considering making changes in order to grow certified organic crops. The farmer currently uses pesticides and liquid fertilizers to grow his crops.
a. What is one environmental and one economic advantage of stopping the use of pesticides on crops?
b. Describe at least three challenges the farmer may face when converting to organic farming.
A farmer who uses biological pest control organisms will reduce envrionmental pollution as well as expenses involved in buying pesticides.
What are the advantages of organic farming?Organic farming is a farming which does not employ the use of chemicals but uses biological and organic materials only.
A farmer who stops using pesticide will reduce envrionmental pollution as well as expenses involved in buying pesticides.
However, the challenges the farmer will face include:
non-selectivity of biological pest control organisms unavailability of biological pest control organisms biological pest control organisms are not effective as pesticides.Therefore, a farmer who uses biological pest control organisms will reduce envrionmental pollution as well as expenses involved in buying pesticides.
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A hypothesis is a __________. theory that is widely accepted by the majority of scientists belief that some but not all scientists share statement that makes a testable prediction question that a scientist wishes to answer about a problem
An archaeological anthropology involves the study of: Group of answer choices language use, meaning, patterns, structure, and evolution. the extremely complex entity called human culture. the biological facets of the human species. the material past of humans.
The study of preceding humans and cultures through material remains is renowned as archaeology. It entails excavating, analyzing, and interpreting artifacts, soils, and cultural processes. The correct option is D.
What are artifacts?Archaeology is the scientific study of human past via the use of material remains. These objects can be anything that people created, modified, or used. Artifacts are commonly used to describe portable remains.
The study of preceding humans and cultures through material remains is renowned as archaeology.
Thus, the correct option is D.
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When walking her 6-year old son for school, a mother observes that the boy is limping. She notices that his left knee is swollen, red, warm to the touch, and movement is painful. He states he fell on the knee 2 days ago while playing with friends. The mother brings her son to see their pediatrician, who removes 15 ml of cloudy fluid from the knee. A Gram stain and culture of the fluid shows gram-positive cocci arranged in clusters. Further culturing of the specimen on Mannitol Salt agar reveals growth yellow hallow around the colonies. Which organism is most likely the cause of this infection
Staphylococcus aureus is the organism which will most likely be the cause of this infection.
What is an Infection?This is defined as the process in which germs invade the body system and the outcome is usually negative.
Staphylococcus aureus is a halophilic bacteria which can grow under salty conditions which is why the mannitol is broken down to acid to form a yellow growth.
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A doctor examined a patient suffering from alcoholism. her symptoms included bleeding gums and loose teeth. the doctor surmised the patient had a vitamin c deficiency and diagnosed her with scurvy. vitamin c is required to produce the support tissue, collagen. this structural support is known as
Vitamin C is required to produce the collagen present in the extracellular matrix.
Vitamin CVitamin C, or ascorbic acid, is a vitamin that dissolves in water and can be found in citrus and vegetables. Vitamin C is key to preventing and treating scurvy, which is a disease that occurs from Vitamin C deficiency (most of the time due to malnutrition or severe alcoholism); the first symptoms of scurvy are weakness and fatigue, but if it does not get treated properly, it can progress to anemia, hemorrhage, periodontitis, changes in personality, and finally death.
Vitamin C is a necessary element for tissue healing, collagen synthesis, and neurotransmitter enzymatic production. It is vital for immune system function and is necessary for the functioning of numerous enzymes. It has antioxidant properties as well.
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The lymphatic system: Group of answer choices has a pumping mechanism to move fluid. is the site of B and T cell clonal deletion. includes areas of high concentrations of APCs, T and B cells. is very impermeable to extracellular fluid. collects fluid from around the brain and spinal cord.
The lymphatic system includes areas of high concentrations of APCs, T and B cells.
What is the lymphatic system?The lymphatic system is a branch of the circulatory system which consists of a system of organs , tissues, cells and vessels known as lymphatic vessels, which help transport the fluid, lymph around the body.
The lymphatic system contains high concentration of immune cells.
Therefore, the lymphatic system includes areas of high concentrations of APCs, T and B cells.
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Which of the following biomes contains the least amount of diversity?
A. Chaparral
B. Savanna
C. Desert
D. Rainforest
Answer:
The answer is C
Explanation:
This is due to the high temperatures, low rainfall, and a lack of available water.
3. How can we use what we know about cell membranes to treat disease
We use cell membranes to treat disease because the cell membrane is one of the main barriers that pathogens need to overcome, hindering their replication.
What is the cell membrane?The cell membrane is a thin lipoprotein film formed by phospholipids and proteins delimiting the cytoplasm of all types of cells. They prevent invading microorganisms from attaching to the cell and replicating.
Then, using the concepts of cell membrane, we can use them to prevent viral diseases from occurring since the virus cannot fix itself to replicate. So in this case, the cell membrane is one of the main barriers that pathogens need to overcome, hindering their replication.
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how are genes and protenes related
Answer:
please learn to ask your Teacher if you are in school and don't rely on the internet okay please
Answer:
Most genes contain the information needed to make functional molecules called proteins. (A few genes produce regulatory molecules that help the cell assemble proteins.) The journey from gene to protein is complex and tightly controlled within each cell. It consists of two major steps: transcription and translation.
Determine whether the following statement is true or false, and why. “The endocrine system releases products into the bloodstream, includes the pancreas, and does not use ducts.”
A. False, it should read, “The endocrine system releases products into the epithelial cells, includes the salivary gland, and does not use ducts.”
B. True
C. False, it should read, “The endocrine system releases products into the bloodstream, includes the pituitary gland, and uses ducts.”
D. False, it should read, “The exocrine system releases products into the bloodstream, includes the pancreas, and does not use ducts.”
The endocrine gland is the one that is ductless an release its secretion directly in bloodstream example liver, pancreas, etc. The given statement is true and the correct option is B.
What is endocrine gland's secretion called?The secretion of endocrine gland is referred to as hormones, which are chemical messengers that helps in body's control and coordination.
The endocrine gland is the one that is ductless an release its secretion directly in bloodstream example liver, pancreas, etc.
Thus, the given statement is true and the correct option is B.
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What do the bubbles in ice cores represent?
a.the annual growth or shrinkage of a glacier.
b. more bubbles are indicative of increased precipitation.
c. tiny samples of earth's atmosphere when the ice formed.
d. types of plants that lived in an area.
Which viral replication cycle is represented in part B of this diagram?
A
t
CLEA
SEL
A. Lytic cycle
B. Dormant cycle
C. Lysogenic cycle
D. Replication cycle
The viral replication cycle that is represented in part B of the above diagram is lysogenic cycle.
What is lysogenic cycle?Virus are organisms that are incapable of replicating on their own without a living host.
This means that they have to infect a living host cell and replicate. Viruses have two major cycles of replication as follows:
Lytic cycleLysogenic cycleThe lysogenic cycle is a form of viral reproduction involving the fusion of the nucleic acid of a bacteriophage with that of a host, followed by proliferation of the resulting prophage.
As observed in the part B of the diagram, the host cell does not burst, hence, it is the lysogenic cycle that is represented by part B.
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Answer: c
Explanation:
They have veins with bundles of xylem and phloem tissues to blank water and blank.
Answer:
move water and glucose
Explanation:
The Cordyceps fungus infects ants and make the ants act like what pop-culture type of undead creature?
The Cordyceps fungus infects ants and make the ants act like pop-culture type of undead creature known as zombies.
What is Parasitism?This is a relationship which one of the species benefit while the other doesn't in this case.
The Cordyceps fungus have a parasitic relationship with ants such that infects them and makes them look like zombies.
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Cordyceps unilateralis is a fungus species that parasites ants and makes them act like zombies.
What is Cordyceps unilateralis?
This is a Cordyceps species that characterize by parasite ants.
The Genus Cordyceps is a parasite fungus that attacks mostly invertebrates causing their death. There are several species that parasite different insects and arachnids.
Once the fungus reaches the invertebrate tegument, it starts growing inside their bodies, destroying the animal from the inside.
Particularly Cordyceps unilateralis attack ants, and they grow and develop inside the insect's body, making them act like zombies.
This fungi species feeds on the animals within and reproduces there. Meanwhile, ants keep their normal habits (foraging, feeding, mating) until the fungus occupies almost half of their bodies.
At a certain development point, the fungus grows needle-like projections that emerge from the ants' heads while sending chemical signals to the ant that make them climb plants near the nest.
Once the ants are upward, they die, and the fungus spreads spores over the ants' nests. This is how they reproduce and attack new ants.
This is why this fungus is known as Zombi Cordyceps.
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The starting molecule for glycolysis is glucose
Which of the following is correct about agarose gel electrophoresis: a. It has a lower resolving power than polyacrylamide gels. b. Agarose gels must be loaded vertically. c. It is used only to separate DNA fragments. d. To separate DNA fragments by agarose gel electrophoresis, one must load near the anode. e. It is a potent neurotoxin and should be handled with care.
Answer:
b. Agarose gels must be loaded vertically
Explanation:
Have a Blessed Day
A hypertonic solution has:
Fewer water molecules outside the cell than are inside the cell
More water molecules outside the cell than are inside the cell
The same number of water molecules inside and outside of the cell
No water inside or outside of the cell
The solution having more water molecules outside the cell than are inside the cell, i.e., option B.
What is a hypertonic solution?A hypertonic solution have more dissolved particles (such as salt and other electrolytes) than normal cells and blood. Hypertonic solutions, for example, are used to soak wounds.
The solution having more water molecules outside the cell than are inside the cell.
Thus, the correct option is B.
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Answer:
More water molecules outside the cell than are inside the cell
Explanation:
A hyportonic solution is a solution which has more dissolved particles present in itself than blood cells or normal cells
The best application is used to soak wounds
Option B
Red blood cells have a nucleus.
True
False
the answer is false, its white blood shells which have a nucleus
Hey everyone I need some help. Base your answer to the following question on the diagrams below which represents two different cells. In both cells, the organelles labeled E are the sites of
A) Secretion
B) Starch Synthesis
C) Food Storage
D) Aerobic Respiration/ Production of ATP
Answer:
aerobics respiration or production of ATP
what is the purpose of the nephridia in the earthworm?
Answer:
A pair of nephridia is present on each segment of the earthworm, They are similar to flame cells in that they have tubules with cilia and function like a kidney to remove wastes.
Explanation:
Hair is largely made up of the protein keratin. why can a shampoo containing protein not replace the protein in damaged hair?
a. the process of replacement needs more time than we spend on washing our hair.
b. internal cell structures are assembled by living cells and cannot be replaced by molecules applied to the cell surface.
c. the hair's polypeptide is built up from amino acids, so shampoo must contain them instead of proteins.
d. cells synthesize proteins from amino acids, not from whole proteins in food or other sources.
e. proteins from a shampoo are synthetic and not organic as are the proteins of the hair.
The shampoo containing protein can not replace the protein in damaged hair because, the hair's polypeptide is built up from amino acids, so shampoo must contain them instead of proteins. That is option C.
What are protein keratin?Keratin is a type of fibrous protein found in the human and animal body which is commonly found at the scales, hair, nails, feathers, horns, claws, and hooves.
These proteins are generated from amino acids but shampoos made up of keratin are not made for amino acids.
Therefore, the shampoo containing protein can not replace the protein in damaged hair because, the hair's polypeptide is built up from amino acids, so shampoo must contain them instead of proteins.
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The transport of large substances out of the cell is accomplished by endocytosis. group of answer choices
Full question:
To transport large substance in and out of the cell, structures called _______ are made from the cell membrane.
Answer:
Vesicles.
What are vesicles?
The fundamental units of all living things are cells. Cells in organisms must be capable of carrying out a variety of tasks in order for the organism to live. The cells must transport molecules from one area of the cell to another in order to perform several of these jobs. Vesicles are used when a cell wants to transport a chemical repeatedly.
A lipid bilayer makes up the cellular organelles known as vesicles. Vesicles can be compared to cellular envelopes that carry things from one location to another. Vesicles are involved in both metabolism and the storage of enzymes.
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Question 8 of 10
A science student makes the following statement.
Based on the data, we determined that plant growth is
affected by the type of soil.
What is the student doing?
OA. Collecting data
B. Forming a hypothesis
C. Making a prediction
OD. Drawing a conclusion
27
SUBMIT
Answer:
D drawing a conclusion
Explanation:
