Assume the two E.coli strains shown below are allowed to conjugate. Hfr: pro+, arg+, his+, lys+, met+, ampicillin-sensitive F-: pro-, arg-, his-, lys-, met-, ampicillin-resistant What supplements would you add to glucose minimal salts agar to select for a recombinant cell that is lys+, arg+, amp-resistant?
A) ampicillin, lysine, arginine
B) lysine, arginine
C) ampicillin, proline, histidine, methionine
D) proline, histidine, methionine
E) ampicillin, proline, histidine, lysine
C
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Which of the following is NOT true about
enzymatic regulatory molecules?
a. they allow an enzyme to catalyze many, diverse reactions. b. they may cause the enzyme to change its overall shape. c. they may enhance the activity of an enzyme. d. they may inhibit the activity of an enzyme. e. they may bind directly to an enzyme’s active site.
__________ conversion occurs when a bacterium carrying viral genes takes on new, atypical
characteristics. a. Transducing b. Lysogenic c. Prophage d. Lytic e. Reverse
Acetyl CoA in the citric acid cycle produces how many ATP, CO2, NADH and FADH2?
What will be an ideal response?
Differences in chromosomal arrangements (such as inversions and translocations) between species can result in postzygotic isolation because:
a. hybrid zygotes die early. b. hybrids are inviable. c. hybrids are sterile. d. hybrids are behaviorally isolated from their parents.