Plant tissues are more than 90 percent ____ by weight
a. carbohydrates
b. water
c. carbon
d. nitrogen
e. cellulose
ANSWER: b
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A hydrogen bond between the amino acid side groups (R groups) from two different polypeptide
chains in a multichain protein would be considered part of the ____ structure of the protein.
a. primary b. secondary c. tertiary d. quaternary e. linear
A J-shaped growth curve is converted to an S-shaped one:
a. when the parents are past reproductive age b. if the data are plotted in reverse c. when the carrying capacity is reached d. if reproduction stops e. only for fast-growing populations such as bacteria
Four of the following are true of euglenoids. Which statement is false?
a. Many move by pseudopods. b. Many contain chloroplasts. c. Many absorb nutrients from their environment in a heterotrophic manner. d. Their cell body is surrounded by a pellicle. e. They use a contractile vacuole to maintain water balance.
Fruits often ripen faster when placed in closed paper bags because of the effect of
(A) cytokinin (B) abscisic acid (C) CO2 (D) gibberellin (E) ethylene