Which statement about a complete digestive system is FALSE?
a. It is characteristic of flatworms.
b. It is a tube with two openings.
c. Its regions are specialized to perform specific functions.
d. Food can be ingested while previously eaten food is being digested.
e. Food enters the mouth and is eliminated through the anus.
a
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Citrate synthase, the first enzyme in the citric acid cycle, is regulated by ATP concentrations. Why is early regulation
of ATP production the most beneficial method for the cell?
a. It is not possible to regulate the last enzyme in a pathway. b. More ATP can be produced before the first enzyme is inactivated. c. ATP production always needs to be maximized. d. Citrate synthase controls the amount of pyruvate produced by glycolysis. e. Regulating early steps conserves cellular fuels.
When a population goes through a bottleneck, ____
a. genetic drift is likely to occur b. mutation rates increase c. extinction rates decrease d. natural selection decreases in intensity e. inbreeding decreases
An example of a plant disease caused by a basiodiomycete is:
a. chestnut blight. b. Dutch elm disease. c. verticillium wilt on potatoes. d. wheat rust. e. ergot of rye.
With regards to prokaryotes and eukaryotes, all of the following are true except