Aneuploidy is the term for a condition in which cells have ________
a. too few complete sets of chromosomes
b. too many or too few copies of a single chromosome
c. three or more complete sets of chromosomes
d. a translocation resulting in a deletion and a duplication
b
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DNA repair:
A. can fix chromosomal inversions and translocations. B. can involve excision of bases flanking a distortion in the helix. C. always prevents errors. D. involves a set of proteins that are always active. E. is only active during DNA replication.
During the first major divergence of life the
atmosphere was a. high oxygen, high carbon dioxide. b. high hydrogen, low oxygen. c. changing from anaerobic to aerobic. d. firmly in the age of aerobes. e. all of these.
A nauplius larva is characteristic of:
A. echinoderms. B. gastropods. C. molluscs. D. crustaceans. E. ctenophores.
The number of chromosome pairs in a species:
a) is always 23. b) is greatest among insects. c) is always greater than three. d) increases with intelligence. e) None of the above are true.