What is the waxy substance suberin typically associated with?
a. root hairs
b. tonoplasts
c. endodermis
d. pericycle
Ans: c. endodermis
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Nematodes and rotifers have a body cavity that is
(a) called a coelom. (b) called a pseudocoelom. (c) completely lined by tissues derived from mesoderm. (d) both a and c.
Which type of meristem is only found in monocots?
a. apical b. lateral c. intercalary d. permanent
Which of the following is true of the structure
labeled "A"? a. It is composed of tubulin subunits. b. It is composed of actin subunits. c. It is a microfilament. d. It is an intermediate filament. e. It is a major component of muscle cells
What change(s) can have detrimental effects on the human food supply?
a. 10%–35% of all U.S. crops are lost to insect damage each year. b. $10 billion per year are spent on insecticides by American farmers. c. Natural selection can create an "arms race" between pest species that feed on crops and pesti-cides developed by humans. d. All of the above.