Which of the following types of plasmids allows a bacterial cell to kill its competitors?

A. virulence plasmids
B. fertility plasmids
C. bacteriocin plasmids
D. resistance plasmids
E. cryptic plasmids


Answer: C

Biology & Microbiology

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Because they are capable of regenerating a complete body from an arm and a piece of the central disk, sea stars must

contain many ____.

a. blood cells b. stem cells c. differentiated cells d. marrow cells e. embryonic cells

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Assuming independent assortment, what proportion of the offspring of the cross AaBbCcDd × AabbCCdd will have the aabbccdd genotype?

What will be an ideal response?

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If high amounts of sulfanilamide are in the presence of an enzyme whose substrate is PABA, what outcome is expected?

a. PABA products will increase in concentration. b. The enzyme will stop functioning. c. The substrate will destroy the inhibitor. d. Sulfanilamide products will be in higher concentration.

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Which region(s) of the X chromosome recombine during meiosis?

A) the heterochromain B) the pseudoautosomal regions C) the male-specific region of the Y D) the centromere E) SRY

Biology & Microbiology