Which of the following is a reason that pollinators ARE considered keystone species?
a. many plant species rely on insects to successfully reproduce
b. pollinators maintain the integrity and productivity of natural communities
c. pollinators are a critical link in the food chain
d. pollinators have complex social structures and division of labor
e. pollinators are not considered to be keystone species
Answer: e. pollinators are not considered to be keystone species
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Which of the following is NOT a type of epigenetic inheritance?
A. maternal effect B. X inactivation C. imprinting D. extranuclear inheritance E. neither maternal effect nor extranuclear inheritance
Which of the following is mismatched?
a. cytokinin – inhibits lateral root formation b. auxin – promotes cell elongation
c. gibberellin – involved in phototropism and gravitropism d. abscisic acid – promotes stomatal closure e. ethylene – promotes leaf abscission
Respond to statements 111–115 in reference to the five stages of
sperm development listed below. a. spermatogonium b. secondary spermatocyte c. primary spermatocyte d. spermatid e. sperm D 111. This is the first stage of development where the male sex cell is haploid. M 112. This continues to undergo mitosis throughout the reproductive life of the male. D 113. This represents the product of the first meiotic division. D 114. This is a mitotic product that then undergoes meiosis. M 115. The male sex cell is fully formed at this stage of development.
A tumor that has gained the ability to spread throughout the body, generally with life-threatening consequences, is known as a _____ tumor.
a. benign b. polyp c. malignant d. growth-promoting