The enzyme ________ adds nucleotides of DNA in the ________ direction when DNA is being semi-conservatively replicated.
A. DNA polymerase I, 5' ? 3'
B. DNA polymerase I, 3' ? 5'
C. DNA polymerase III, 3' ? 5'
D. DNA polymerase III, 5' ? 3'
Answer: D
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Examine the photomicrograph on the right, taken using an oil-immersion objective, the highest practical magnification of a light microscope. (The final magnification is 770x.)
(a) Based on your observation, identify the kingdom to which the organism belongs. (b) Justify your answer.
Methicillin is a medicine that inhibits cell wall production. Why does this make it a suitable antibiotic for eliminating bacterial infections in humans?
A. Human cells do not have cell walls. B. Human cells and bacterial cells are completely different, so methicillin does not affect human cells. C. All humans have a gene giving methicillin resistance. D. Human cells have a plasma membrane in addition to the cell wall that allows them to survive in the presence of methicillin. E. The cell wall of human cells is not sensitive to methicillin.
Competitive exclusion is based on the idea that
a. one species will hold some sort of advantage over the other one. b. no two species can completely occupy the same niche. c. the more two species overlap in their capacity to obtain and use resources the less likely they are to coexist. d. all of these are true. e. none of these are true.
Which molecule is involved in transcription?
a. tRNA b. DNA, 5'-3' strand c. DNA, 3'-5' strand d. DNA polymerase