When riding a horse, a jockey squeezes his thighs together to stay on the saddle. This is an example of ____
a. flexion
b. extension
c. abduction
d. adduction
e. pronation
ANSWER: d
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In the Calvin cycle, the enzyme that catalyzes the capture of carbon dioxide and the formation of 3-phosphoglycerate is
A) phosphoglycerokinase. B) ribulose bisphosphate carboxylase/oxygenase (rubisco). C) triose phosphate isomerase. D) phosphoribulokinase. E) glyceraldehyde-3-phosphate dehydrogenase.
The early Earth reducing atmosphere is thought to have lacked which of the following gases?
A. N2. B. O2. C. CO2. D. H2O. E. SO4.
An organism whose genetic makeup allows it to produce more offspring than another of its species is said to have greater
a. fitness. b. evolution. c. foraging. d. selection.
Proteins that function as a catalyst
A) slow down the speed at which chemical reactions occur but do not alter the final products formed. B) facilitate chemical reactions by altering the final products formed. C) maintain primary structure. D) can participate only in reactions that synthesize new products. E) are referred to as enzymes.