To produce recombinants in phage ________
A) one crossover is required
B) two crossovers are required
C) phage recombinants do not occur
D) the F factor must be present
E) a bacterial cell must be competent
Answer: C
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The vast majority of proteins expressed early in an animal's development
a. are translated from preexisting mRNAs present in the unfertilized egg. b. are translated from preexisting mRNAs delivered by the sperm that fertilized an egg. c. are translated from mRNAs that were transcribed from the zygote's DNA in the first three rounds of cell division. d. are transcribed and translated from the unfertilized egg's DNA postfertilization. e. were present as inactive proteins in the unfertilized egg.
Testosterone
a. stimulates spermatogenesis. b. promotes the normal development and maintenance of sexual behavior. c. is responsible for the development of male secondary sexual characteristics. d. is responsible for the development of the male genitalia. e. does all of these.
What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants?
A) There is considerable genetic variation in garden peas. B) Traits are inherited in discrete units, and are not the results of ?blending.? C) Recessive genes occur more frequently in the F1 than do dominant ones. D) Genes are composed of DNA. E) An organism that is homozygous for many recessive traits is at a disadvantage.
__________ are the specialized reproductive structures of angiosperms.
Fill in the blank(s) with the appropriate word(s).