The last intermediate produced in the Krebs cycle
before the entry of the next acetyl-CoA is
a. pyruvate.
b. acetyl-CoA.
c. fructose bisphosphate.
d. oxaloacetate.
e. citrate.
Answer: d
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Suppose you came across a novel organism you suspected belonged to one of the following animal phyla: Porifera, Cnidaria, Ctenophora, or Acoelomorpha
Which of the following characteristics would NOT be helpful in placing the organism into the correct phylum? A) the organism's feeding strategy B) the organism's habitat C) whether the organism has a coelom D) whether the organism has a gut E) whether adults are sessile or motile
Which one of the following incorrectly matches a molluscan structure with its typical function?
A. ctenidia—secretion of the shell (when present) B. visceral mass—houses organs of digestion, excretion, reproduction C. foot—locomotion D. nephrostome—collection of nitrogenous wastes E. radula—feeding organ
Populations that suffer significant reductions in number may experience two population-genetic consequences that together can hasten their decline. Which two processes are likely to act in concert in small populations, and what is their effect?
What will be an ideal response?
When the rodenticide warfarin was first introduced, rats were very susceptible to it. The development of resistance to warfarin by rats was the result of
A. the development of other blood clotting factors. B. natural selection of individuals that had a beneficial mutation. C. the high biotic potential of rodents. D. inheritance of acquired characteristics. E. mutation induced by warfarin.