What is a possible cause of the chromosomal aberration called a "duplication"?
A) a chromosome fragment that breaks off and does not rejoin any chromosome
B) nondisjunction
C) exchange between non-homologous chromosomes
D) unequal crossing over
E) breaking of a chromosome fragment, then rejoining in a flipped orientation
Answer: D
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What portion of an amino acid must be removed before it can be used in glucose catabolism?
a. phosphate group b. acetaldehyde group c. amino group d. carboxyl group
Which of the following statements concerning gymnosperms and angiosperms is FALSE?
a. Both groups are heterosporous. b. In both groups the sporophyte generation is dominant. c. Both groups posses vascular tissues. d. Both groups produce seeds. e. Both groups have free-living gametophytes.
In organogenesis, the ectoderm gives rise to:
a. muscle. b. the digestive tract. c. sense organs. d. the circulatory system. e. skeletal tissue.
The bottleneck effect is thought to be responsible for the loss of genetic variability in certain populations.
Answer the following statement true (T) or false (F)