You insert a fragment of sheep DNA into a plasmid containing an AmpR gene. You transform bacteria with the recombinant plasmid, and plate the cells on growth media containing the antibiotic ampicillin. Each colony on the plate arose from ________ that ________ to ampicillin.
A. many bacteria; are sensitive
B. a single bacterium; is resistant
C. a single bacterium; is sensitive
D. many bacteria; are resistant
Answer: B
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A. Amoebozoa B. Archaeplastida C. Stramenopila D. Opisthokonta E. Excavata
Which of the following sigma factors would be expected to associate with RNA polymerase after increasing the incubation temperature of an E. coli culture from 30°C to 42°C?
A. ?28 B. ?32 C. ?38 D. ?42 E. ?54
Which of the following characteristics distinguished T cells from B cells?
A. B cells produce immunoglobulin while T cells do not. B. B cells originate in the bone marrow while T cells do not. C. B cells form memory cells while T cells do not. D. B cells are lymphocytes while T cells are not.
A ________ is a specific segment of DNA that codes for the production of one functional product.
A. operator B. exon C. intron D. triplet E. gene