The ability of glucose to repress the lac operon depends on which effector molecules?
A. allolactose
B. cAMP
C. tryptophan
D. ADP
E. starch
B. cAMP
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Air rushes into the lungs of humans during inhalation because _____
A) the rib muscles and diaphragm contract, increasing the lung volume B) the volume of the alveoli increases as smooth muscles contract C) gas flows from a region of lower pressure to a region of higher pressure D) pulmonary muscles contract and pull on the outer surface of the lungs E) a positive respiratory pressure is created when the diaphragm relaxes
The cycle in which lactate is removed from muscle tissue and returned to the liver to produce glucose is called
A) gluconeogenesis. B) glycolysis. C) fermentation. D) the Calvin cycle. E) the pyruvate recovery cycle.
Which of the following statements about the relationship between ants and acacia trees is/are accurate? Check all that apply.
_____ The ants protect the acacias from other insects. _____ The ants protect the acacias from epiphytic plants and vines. _____ The ants live in the hollow thorns of the acacias. _____ The ants are provided with sugar or other nutrition by some species of acacia. _____ The ants aid pollination of the acacias.
Four of the five answers listed below are parts of the same sense organ. Select the exception
a. cochlea b. cornea c. sclera d. choroid e. fovea