Cell biology emerged from which of the following fields of biology?
A) biochemistry
B) cytology
C) genetics
D) all of the above
E) none of the above
D) all of the above
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Animals capable of producing their own body heat by way of metabolism and of retaining it are said to be
A. metabolic. B. thermogenic. C. thermodynamic. D. endothermic.
The initial exposure to an antigen is indicated by
a. A. b. B. c. C. d. D. e. E.
cAMP levels decrease when __________. This results in __________ of CAP
a. lactose levels increase; activation b. lactose levels decrease; inhibition c. glucose levels increase; inhibition d. glucose levels decrease; activation e. glucose levels decrease; inhibition
Which of the following statements is true?
a. Presently, extinctions are occurring at a very slow pace. b. Mutations, both contemporary and prehistoric, have been the single greatest cause of extinctions. c. The fossil record indicates that there has been very little animal extinction until recently. d. Evolutionary history is often represented by extinctions. e. Organisms compete for limited resources in all environments, possibly leading to extinctions of some.