Most of the water and sodium is reabsorbed in the ____ of each nephron
a. glomerulus
b. proximal tubule
c. distal tubule
d. loop of Henle
e. collecting duct
B
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Because oxygen is more electronegative than hydrogen, the water molecule is:
A. hydrophobic. B. hydrophilic. C. nonpolar. D. ionic. E. polar.
What is the function of NADH and FADH2?
a. Both release energy for glycolysis to proceed forward. b. Both provide electrons to the electron transfer system. c. Both produce ATP by substrate-level phosphorylation. d. NADH delivers electrons, while FADH2 supplies H+. e. NADH is found only in the cytosol and FADH2 only in the matrix.
The greatest mass extinction of all time, which occurred at the end of the Permian period:a
affected plants living on land more than any other group. b. was spread out over several million years. c. resulted in the extinction of more than 90% of all existing marine species. d. only impacted a few geographic regions, although the impact in these regions was staggering. e. did not affect terrestrial species
The eye is a warm, moist environment favored by many harmful bacteria. Nevertheless, eye infections are relatively rare. Why is this?
A) The enzyme tearase inhibits bacterial growth. B) Tears contain the antibacterial enzyme lysozyme. C) The eyes are constantly exposed to UV light, which inhibits bacterial growth. D) Antibodies, particularly IgM, are secreted in abundance in the tears.