Complete transfer in an Hfr × F- mating takes approximately ________ minutes.

A. 20
B. 200
C. 50
D. 100


Answer: D

Biology & Microbiology

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Which of the following statements best describes the habitats of Vibrio spp., Aeromonas spp., Plesiomonas shigelloides, and Chromobacterium violaceum?

a. Habitats are limited to the upper respira-tory tract of various mammals. b. Habitats are limited to the gastrointestinal tract. c. Habitats are mostly soil and water envi-ronment. d. Habitats are limited mostly to soil.

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Which of the following forms of contraception is removable?

A. An intrauterine device B. A tubal ligation C. A vasectomy D. None of these

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If SSB is not present during DNA replication, what would you expect to see?

A) The replisome complex would not assemble on the oriC region. B) The DNA cannot bend, so hydrogen bonds in the 13-mer region of oriC remain intact. C) Helicase activity is inhibited, so DNA strands cannot be separated. D) SSB carries the helicase protein to the open region of DNA, so hydrolysis and strand separation will not occur. E) SSB prevents reannealing of the separated strands, so strands would quickly reanneal and DNA replication cannot proceed.

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Immovable joints such as those found between bones of the skull are ________ joints

Fill in the blank(s) with correct word

Biology & Microbiology