Viruses that become established as stable parts of the host cell genome are called
A. virulent.
B. lethal.
C. temperate.
D. potent.
Answer: C
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When DNA gyrase was isolated, Brown and Cozzarelli assessed its activity by gel electrophoresis
Relaxed DNA was shown to become increasingly supercoiled over time until all of the relaxed DNA at the top of the gel would run at the bottom of the gel. If the pattern of bands generated by DNA gyrase was compared to the pattern of a type I topoisomerase, how would they differ? What will be an ideal response?
Which gene is correctly matched with its evolutionary significance?
A. The Hox genes - evolution of body plans. B. The BMP4 gene - evolution of lungs. C. The gremlin gene - evolution of the simple eye. D. The Pax6 - evolution of skull shape.
During mitosis, if all of the chromosomes in a diploid cell fail to separate and instead segregate into one daughter cell, the result will be what?
A) one monoploid daughter cell and one triploid daughter cell B) one 2x-1 daughter cell and one 2x+1 daughter cell C) two 2x daughter cells D) only one tetraploid daughter cell
If blood is too acidic, bicarbonate ions enter the bloodstream via the
a. collecting ducts. b. proximal tubules. c. distal tubules. d. peritubular capillaries. e. Henle's loop.