Before an mRNA transcript exits the nucleus, ______ may be added and ______ removed.
A) introns; RNA polymerase
B) a termination site; a promoter site
C) DNA; RNA
D) a cap and a tail; introns
E) RNA polymerase; a cap and a tail
D) a cap and a tail; introns
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Plant cells often have a large membrane-bound sac that is used for storing water and other substances called a:
A. central vacuole. B. Golgi body. C. centriole. D. chloroplast. E. nucleus.
The lacZ and lacY genes are transcribed when:
A. lactose is present, regardless of the level of glucose in the cell. B. lactose is absent and glucose levels are high. C. lactose is present and glucose levels are low. D. glucose levels are high and lactose levels are low. E. glucose levels are low, regardless of the level of lactose in the cell.
The greatest mass extinction of all time, which occurred at the end of the Permian period:a
affected plants living on land more than any other group. b. was spread out over several million years. c. resulted in the extinction of more than 90% of all existing marine species. d. only impacted a few geographic regions, although the impact in these regions was staggering. e. did not affect terrestrial species
Blood pressure is usually estimated from indirect measurements of the pressure in what structure?
A) left ventricle B) aorta C) femoral artery D) brachial artery E) radial artery