Which of the following leads to the destruction of the host cells?
A) lysogenic cycle
B) lytic cycle
C) prophage
D) temperate phage
Ans: B) lytic cycle
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which of the following accurately describes an operon?
A. a transcription unit that codes for 1 polypeptide and is controlled by one promoter and one terminator B. a transcription unit that codes for several polypeptides zand is controlled by one promoter and one terminator C. is present only in prokaryotes D. both a and b E. both b and c
Mate guarding is a reproductive tactic that functions to:
a. reduce paternity uncertainty. b. increase the female's investment in the offspring. c. reduce the male's reproductive investment. d. reduce the female's fitness. e. increase the number of mates to which a male has access.
How would you know that viruses were multiplying in a confluent lawn of E. coli on a solid culture medium?
a. There would be small zones of clearing in the bacterial culture. b. There would be small blue spots on the bacterial culture. c. The bacterial culture would grow faster d. The bacterial colonies would swell.
The medicinal leech, once used to withdraw "unhealthy" blood from patients, produces ________ to ensure blood flow from the host?
A. anticoagulants B. antibodies C. blood clots D. antibiotics E. suture material