Skeletal muscles make up approximately
____% of the body weight of a young man of
average fitness.
a. 15
b. 20
c. 25
d. 30
e. 40
E
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Sperm cells swim actively using their flagellum. To support this activity, these cells have high
numbers of __________.
a. mitochondria b. endoplasmic reticulum c. muscles d. ribosomes
Coronary circulation involves ____
a. only the aorta b. only the coronary arteries c. only capillaries d. the aorta and coronary arteries e. the aorta, coronary arteries, and capillaries
In the nitric oxide signaling pathway, nitric oxide activates an enzyme that can convert many molecules of GTP into molecules of cGMP. cGMP is a small molecule that can diffuse through the cytoplasm and bind to an enzyme called protein kinase G (PKG). Binding of cGMP to PKG leads to a change in the confirmation of PKG that leads to its activation. What type of signaling molecule is cGMP?
A. Adapter protein B. Enzyme C. Second messenger D. Scaffold
Which came first, the chicken or the egg?
a. The egg, because the chicken had to cross the road to sit on it. b. The egg, because the amniotic egg evolved well before the first bird. c. The chicken, because during speciation the adult stage always precedes the juvenile stage. d. The chicken, because the amniotic egg did not evolve until after the first chicken appeared. e. The egg, because the chicken is not a real species.