How many passes through the Krebs cycle are required
to break down a glucose molecule completely?
a. 2
b. 3
c. 4
d. 6
e. 12
Answer: a
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Mollusk eyes and vertebrate eyes are
A. analogous structures, because they arise from the same structures during development. B. analogous structures, because they have the same function but derive from different common ancestors. C. homologous structures, because they have different functions. D. homologous structures, because they are derived from the same common ancestor.
Steroid hormones are synthesized from _____
a. amines c. proteins b. peptides d. cholesterol
Which of the following are threatened by red
imported fire ants?
a. native ant populations b. ant-eating lizards c. ground-nesting birds d. native plants e. all of these
The most common type of neuron in vertebrates is the _________ neuron.
A) unipolar B) multipolar C) bipolar D) semipolar