Based on the intermediate disturbance hypothesis, a community's species diversity is increased by _____
A) frequent massive disturbance
B) stable conditions with no disturbance
C) moderate levels of disturbance
D) human intervention to eliminate disturbance
E) intensive disturbance by humans
Answer: C
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Which of the following statements is true of histones?
A) Each nucleosome consists of two molecules of histone H1. B) Histone H1 is not present in the nucleosome bead; instead, it draws the nucleosomes together. C) The carboxyl end of each histone extends outward from the nucleosome and is called a "histone tail." D) Histones are found in mammals, but not in other animals or in plants or fungi.
The major purpose of a pair bond is to form a stable relationship for the purpose of:
a. securing food. b. defending territory. c. kin selection. d. mating and caring for young. e. selection of a mate.
Which of the following organisms would most likely produce asexually?
A. a worker honeybee B. a lizard in an equatorial desert C. a mammal in a temperate forest D. a bird in an urban environment
When introduced into mitotic cells, which of the following is expected to impair anaphase B but not anaphase A?
(a) an antibody against myosin (b) ATP?S, a nonhydrolyzable ATP analog that binds to and inhibits ATPases (c) an antibody against the motor proteins that move from the plus end of microtubules to the minus end (d) an antibody against the motor proteins that move from the minus end of microtubules toward the plus end