You explain to your study group that a hypothesis is:
A. an explanation that accounts for careful observations.
B. a proposition that will be true and fits the known facts.
C. constant over time.
D. a theory.
Answer: A
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Perhaps a plant's greatest liability is its
inability to a. produce growth hormones. b. use aerobic respiration. c. move when conditions around it deteriorate. d. produce its own lipids and proteins. e. respond to dwindling supplies of nutrients and water.
Background extinction is a measure of the ____
a. rate of species turnover at the end of geological eras b. number of species that suffer extinction at the beginning of geological eras c. steady rate of species turnover within a lineage throughout most of their evolutionary history d. lowest rate of species turnover within a lineage observed within a geological era e. animals that appear in the dense forest
The elaborate courtship displays common among animals are the result of
A) stabilizing selection. B) random mating. C) disruptive selection. D) sexual selection. E) spontaneous mutations.
Which of the following statements regarding antibody function is FALSE?
A. They can prevent virus attachment to host cells. B. They can facilitate phagocyte attack on bacteria with a capsule (glycocalyx). C. They can penetrate host cells to bind intracellular antigens. D. They can facilitate cytotoxic attack by natural killer lymphocytes. E. They can bind more than one pathogen at a time, forming complexes.