Which of the following is not a property of homologous chromosomes?
A) They pair physically during prophase of meiosis I.
B) They exchange genes by crossing over during meiosis.
C) They carry alleles for the same genes at the same chromosomal position.
D) Their centromeres are attached to each other during G2 of the cell cycle.
E) They segregate to opposite poles at anaphase of meiosis I.
D) Their centromeres are attached to each other during G2 of the cell cycle.
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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.
Interspecific competition includes all of the following EXCEPT competition for __________
a. mates b. food c. habitat d. water
Research has shown that commercial fisheries place selective pressure on fish populations by
harvesting mostly the ____ fish, resulting in ____.
a. young; aging populations b. larger; maturity at smaller sizes c. smaller; maturity at larger sizes d. prereproductive; declining birth rates e. postreproductive; no change in population size
Adaptive immunity has a response time of ____
a. immediate response b. 1-2 days c. 7-10 days d. 2 weeks e. one month