Some local populations, and occasionally entire species, have reduced genetic diversity because their populations were severely reduced in the past. This is called a 

A. genetic bottleneck.
B. frequency loss effect.
C. genetic drift.
D. population drain.


A. genetic bottleneck.

Biology & Microbiology

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Pyruvate is converted to acetyl CoA by a unique enzyme known as

A) pyruvate decarboxylase. B) pyruvate dehydrogenase complex. C) transitionase system. D) multiplex enzyme system. E) pyruvate CoA transferase.

Biology & Microbiology

Which of the following statements is false regarding the nicotinic acetylcholine receptor?

A) The actions of acetylcholine can be mimicked by nicotine. B) It binds one molecule of acetylcholine for activity. C) The open channel allows an influx of sodium ions. D) Biochemical purification was aided by cobratoxin. E) It is comprised of four large subunits.

Biology & Microbiology

Which of the following is not a member of

Osteichthyes? a. teleosts b. ray-finned fish c. lungfish d. stingrays e. lobe-finned fishes

Biology & Microbiology

In glycolysis, one molecule of glucose containing six carbons is converted to two molecules of ________ containing three carbons each. This reaction also yields two molecules of _______ and two molecules of _______.

a. pyruvate; ATP; NADH b. lactic acid; O2; acetaldehyde c. sucrose; lactic acid; FADH d. acetyl-CoA; ADP; Pi e. galactose; H2O; ATP

Biology & Microbiology