Which of these is a direct source of energy for muscle contraction?
a. ATP.
b. glycogen.
c. glucose.
d. fatty acids.
c
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Animals transitioned from water to land through a series of significant morphological and physiological changes. Which of the following did not contribute to the transition?
A. the ability to breathe air B. the evolution of appendages that could support the weight of the body C. the evolution of jaws for better prey capture and feeding
Because ____ is less likely to occur between distant populations of the same species, their gene pools and phenotypes
are often somewhat different.
a. genetic drift b. a population bottleneck c. a founder effect d. gene flow e. asexual reproduction
If two or more polypeptide chains associate into one molecule, this is considered part of the ________ structure of the protein
a. secondary b. tertiary c. primary d. quaternary
On the illustration, "A" and "B" should be
labeled respectively a. consumers; producers b. decomposers; producers c. producers; redistributors d. producers; consumers e. consumers; decomposers