The characteristic that enables efficient gas exchange in capillaries is:
a. the very short total length of the capillaries.
b. their proximity to the heart.
c. thick walls of connective and muscle tissue.
d. walls that are only one cell thick.
e. vasoconstriction.
D
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In a catalyzed reaction a reactant is often called a _______.
Fill in the blank(s) with the appropriate word(s).
The main function of cellular respiration is to produce
A) NADH and FADH2. B) glucose. C) CO2. D) ATP.
X inactivation in calico cat fur results in ________________.
A. formation of secondary male characteristics B. mosaic hair color in females C. mosaic hair color in males D. hairless phenotype E. all-white hair color
The disadvantages of using distance methods to construct trees include the fact that:
a. distance methods lack any sort of underlying evolutionary model. b. the assumption is made that similarity is a reflection of homology. c. Both of the above. d. Neither of the above.