A dehydrated runner drinks a lot of water after a race. They rehydrate because
A. the stomach and bloodstream are isotonic compared to each other.
B. the bloodstream is hypotonic compared to the stomach.
C. water will diffuse from a low to high concentration.
D. the stomach is hypotonic compared to the bloodstream.
Answer: D
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Imagine that a cell has a genetic mutation so that the primase enzyme is unable to make RNA strands
Assuming that all of the other enzymes directly involved in DNA replication are still functional in these cells, how much of the process of DNA replication would you expect to see in these cells?
a. The leading strand would be synthesized, but not the lagging strand. b. None of it at all, no part of the DNA replication process could occur. c. The DNA helix would be unwound by helicase, but no new strands will be produced at all. d. Both the leading and lagging strand would be synthesized, but pieces of discontinuous strands would not be joined together. e. DNA replication would still proceed completely, since RNA strands are not part of the final product of DNA replication.
What is a possible reason deep-sea animals can be much larger than their surface relatives? a. They acquire more nutrients
b. They need their size for protection. c. They have a longer lifespan. d. Larger sized animals can attract mates easily.
What is the best explanation for why the arthropods, such as insects, spiders, and crabs, were the first animals to move onto land?
a. The majority of early arthropods did not have to have a moist environment for their survival. b. They possessed primitive lungs. c. They had stout, fleshy fins that allowed them to crawl on land. d. By chance, they already possessed structures suited to life on land so the transition was easier. e. When they moved to land, they encountered no predators.
Scientists estimate that at least 50-60% of all species now living will most likely become extinct in the next 20-50 years unless planned, coordinated action takes place.
Answer the following statement true (T) or false (F)