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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The autonomic nervous system contains the sympathetic and the parasympathetic nervous system.
a. true b. false
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.
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
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.