DNA contains the nucleotide thymine, but RNA uniquely contains ________, which is complementary to adenine.
A) uracil
B) guanine
C) thymidine
D) cytosine
E) adenine
A) uracil
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Which of the following statements is true concerning sonic muscles?
A) They contract at much higher frequencies than the locomotor muscles found in the same organism. B) They utilize completely different muscle proteins. C) They have a very slow rate of cross-bridge cycling. D) They are able to contract rapidly while producing large amounts of force.
The length of hair is determined by the
A. angle of the hair root. B. age of the person. C. rate of hair growth. D. length of the resting stage. E. size of the hair bulb.
Which of the following must pass through the diaphragm?
a. a splanchnic nerve b. vagus nerve c. sympathetic trunk d. all of the above
Lateral plate mesoderm gives rise to most of the components of the cardiovascular system.
Answer the following statement true (T) or false (F)