The extrachromosomal piece of DNA that can replicate itself and often carries virulence genes is known as
A. Episome
B. Plasmid
C. Nucleoid
D. F pilus
Ans: B. Plasmid
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The generally accepted explanation for the movement of organic compounds in phloem is ____
a. the cohesion-tension theory b. the pressure flow theory c. active transport d. the transpiration-pull theory e. root pressure
Attenuation in trp gene regulation is accomplished by
A) reducing permeability of tryptophan, the effector molecule. B) blocking expression of trp mRNA. C) formation of secondary mRNA structures in the leader region. D) binding with RNA polymerase. E) repression of the trp operator.
The stage of prophase I in which mammalian oogenesis can arrest for years is
A) leptotene. B) zygotene. C) pachytene. D) diplotene. E) diakinesis.
Disassortative mating may be beneficial because:
a. it will likely reduce the probability of a deleterious recessive being expressed. b. it will maximize the genetic diversity in the offspring. c. it makes it easier to find a mate. d. A and B. e. All of the above.