Following cleavage of the zygote, which of the following is the first to occur?
a. blastula
b. gastrula
c. neural crest
d. morula
e. primitive streak
d
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The outer main section of the kidney is the
A. renal periphery. B. renal medulla. C. renal cortex. D. glomerulus. E. collecting duct.
The reaction below represents a ____ reaction.
A. dehydration synthesis
B. hydrolysis
C. unbalanced
D. equilibrium
Which of the following statements about plant cell walls is false?
A) Plant cell walls consist of cellulose fibers embedded in a matrix of polysaccharides and proteins. B) Plant cell walls are multilayered structures. C) Plant cell walls protect plant cells by forming an impermeable layer around the cell. D) Wood is primarily composed of plant cell walls.
Overall, the membrane-associated electron transport system pumps ________ protons across the membrane for every molecule of NADH that is oxidized.
A) 2 B) 5 C) 6 D) 10