An animal cell lacking oligosaccharides on the external surface of its plasma membrane would likely be impaired in which function?
A) transporting ions against an electrochemical gradient
B) cell-cell recognition
C) attaching the plasma membrane to the cytoskeleton
D) establishing a diffusion barrier to charged molecules
B
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Plants are raised under artificial lights turned off and on by an electric clock. Some are given long periods of light, others short periods. This is an example of:
A. deductive reasoning B. a hypothesis C. inductive reasoning D. an experiment E. a theory
In the figure above, which number identifies the structure that transmits auditory signals to the brain?
a. 2 b. 6 c. 7 d. 8 e. 9
What was the basic problem with the Miller-
Urey early atmosphere experiments?
a. there was no lightning on the early Earth b. there was no hydrogen gas in Earth’s early atmosphere c. they used oxygen gas which was not present in Earth’s early atmosphere d. the mixture of gases they used was not representative of Earth’s early atmosphere e. more than one of these is correct
Why do islands often make good "laboratories" for studying the mechanisms of extinction?
a. Island species tend to be especially resilient to extinction. b. Islands tend to harbor endemic species. c. Island populations of a species are good representatives of the same species' continental popu-lations. d. Biological communities of islands are less complex than the biological communities of conti-nents. e. B and D,