The first australopithecine fossils were unearthed in
A. Asia.
B. Europe.
C. South America.
D. North America.
E. Southern Africa.
Answer: E
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What is the difference between Ras and the G proteins bound to G protein-coupled receptors (GPCRs)?
A. Ras is a second messenger, and the G proteins bound to GPCRs are not second messengers. B. Ras is an enzyme, and the G proteins bound to GPCRs are not enzymes. C. Ras can activate different effector molecules, and the G proteins bound to GPCRs cannot activate different effector molecules. D. Ras is a small G protein, and the G proteins bound to GPCRs are not small G proteins.
After glycolysis but before the citric acid cycle
A) pyruvate is oxidized. B) a carbon atom is added to pyruvate to make a four-carbon compound. C) coenzyme A is cleaved off pyruvate. D) glucose is split, producing two molecules of pyruvate.
The autonomic nervous system contains the sympathetic and the parasympathetic nervous system.
a. true b. false
Male mallard ducks have had emerald green head feathers and wings with metallic blue patches for hundreds of years, whereas females have been drab, brown-feathered ducks. This phenotypic situation suggests that mallards may be an example of ____.
A. directional selection B. Polyploidy C. allopatric speciation D. disruptive selection E. sexual selection