The first australopithecine fossils were unearthed in

A. Asia.
B. Europe.
C. South America.
D. North America.
E. Southern Africa.


Answer: E

Biology & Microbiology

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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.

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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.

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The autonomic nervous system contains the sympathetic and the parasympathetic nervous system.

a. true b. false

Biology & Microbiology

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

Biology & Microbiology