Each of the following mechanisms plays a role in the return of blood to the heart via veins EXCEPT which one?
A) osmotic pressure exerted by plasma proteins in the blood
B) squeezing action of skeletal muscles
C) valves that permit the one-way flow of blood returning to the heart and prevent backflow
D) pressure changes in the abdominal and thoracic cavities associated with breathing
A
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DNA participates in protein synthesis through
A) cyclic messengers. B) direct pairing with amino acids. C) an RNA intermediate. D) protein folding.
Blood is delivered to each nephron by
a. an efferent arteriole. b. peritubular capillaries. c. a renal capsule. d. an afferent arteriole. e. proximal tubules.
Flower homoeotic genes encode: __________
A) MADS box genes B) homeobox genes C) pair-rule genes D) housekeeping genes E) morphogen genes
The key element in catabolic reactions is that they ________
a. release energy b. are irreversible c. require different amounts of energy to proceed d. cause digestive enzymes to be released e. are condensation reactions