Within the transcription bubble, the 9 most recently added nucleotides in the newly synthesized RNA strand temporarily form a helix with the template DNA strand. How might transcription be affected if helix formation did not occur?
A. Rewinding the DNA molecule would be inhibited.
B. Unwinding the DNA molecule would be inhibited.
C. The position of the 5' end of the RNA would be unstable, inhibiting elongation.
D. The position of the 3' end of the RNA would be unstable, inhibiting elongation.
E. The position of the 5' end of the RNA would be unstable, stimulating elongation.
D. The position of the 3' end of the RNA would be unstable, inhibiting elongation.
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Why is a false positive more significant in HIV testing of patients than in screening donated blood for transfusions?
A. It isn't-both are equally dangerous/significant. False-positives in PEOPLE can lead to psychological trauma, but false-positives in BLOOD could lead to the useful blood being disposed. B. A false-positive in a PERSON is easily retestable. This makes it more significant, because we would simply quickly retest the person to verify their actual HIV status. C. A false-positive in BLOOD is easily retestable. This makes it less significant, because we would simply quickly retest the blood to verify its actual HIV status. D. This statement is backwards-false-positives in blood testing are more significant. If the false-positive rate is high and we don't realize it, we're more likely to dispose useful blood. This could lead to acute shortages of blood for patients who need transfusions.
Even though the caudal fin of sharks tends to direct the fish downward when swimming (due to slight downward force generated by the heterocercal tail) the shark still manages to swim at a fairly consistent depth. Explain how can this be so
What will be an ideal response?
Which land biome has the greatest primary production?
1.Coniferous forest 2.Temperate grasslands 3.Temperate deciduous forests 4.Tropical forests
Which cells cannot be used to produce a karyotype?
A. red blood cells B. epithelial cells C. skeletal muscle cells D. white blood cells E. smooth muscle cells