A good reason for why tobacco smoke is considered a carcinogen is because it causes mutations leading to cancer.
Answer:
Meiosis consists of one round of DNA replication and two rounds of chromosome segregation.
Explanation:
The animals used in an experiment that involves USDA pain category B, C, and D activities performed on the same animal should be categorized to USDA category D.
The USDA pain categories are used to categorize the level of pain an animal used in testing and research will be exposed to. The categories are as follows:
- USDA B: the animal will not feel pain of any kind
- USDA C: the animal will feel the occasional slight pain
- USDA D: Painful procedures that will be mitigated by pharmaceuticals.
- USDA E: Painful procedures that will not be mitigated.
Category B states the animal will not feel pain. Animals in this category are often used for breeding, which is a natural process that does not cause animal distress or pain.
Animals in category C may feel the occasional slight pain which is allowed to subside naturally without the use of pharmaceuticals. This may include procedures such as
- Drawing blood samples
- Injections
Animals in category D are exposed to painful or stressful procedures and will receive anesthetics and other chemical agents to mitigate or completely relieve the pain, Whereas E category animals do not receive said assistance.
These categories follow a strict rule. Animals must be categorized according to the most painful procedure it will undergo, so because the experiment will use USDA B, C, and D procedures, the animals must be placed into USDA category D.
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<u>Answer:</u>
When cells are in an <u>isotonic</u> solution, they are maintaining homeostasis.
<u>Explanation:</u>
"Homeostasis" is the process to maintain a stable and relatively constant internal environment. In addition to temperature it is maintained for many other factors too. "Isotonic solution" comprised of two solutions having the similar osmotic pressure across a semipermeable membrane.
Such solution maintain homeostasis of a cell via diffusion process. As in such solution the overall concentration on both sides of the membrane remains equal. The cell membrane command the movement regrading entrance and exit of anything in cell, the membrane control water and ion transport because of its phospholipid bilayer structure.