What is not a feature of humans that
differentiates us from apes?
a. Bipedalism.
b. Precision grip.
c. Larger brain.
d. Little body hair.
e. All of these
E
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Which of the following is an example of a commensalism?
A) fungi residing in plant roots, such as endomycorrhizae B) bacteria fixing nitrogen in plants C) rancher ants that protect aphids in exchange for sugar-rich honeydew D) cattle egrets eating insects stirred up by grazing bison
Which of the following statements is FALSE?
A) When plant cells are growing, they release expansins, which are enzymes that can expand the primary cell wall. B) The secondary cell wall often contains structural components, like lignin, that form a relatively rigid and complex network within the cell wall. C) A plant cell continues growing after the secondary cell wall forms but stops growing with the formation of the tertiary cell wall. D) Pectin is a component of the cell wall that attracts and holds water.
Which figure correctly illustrates the mechanism of action of the sodium-potassium pump?
A. A
B. B
C. C
D. D
The two amino acids depicted above both have side groups (R groups) that are
a. acidic and polar. b. uncharged and nonpolar. c. basic and polar. d. positively and negatively charged and nonpolar. e. uncharged and polar.