Identify the individual who disproved spontaneous generation by using a swan-neck flask to show that air and dust were the source of microbes.
A) Carl Woese
B) Theodore Schwann
C) John Needham
D) Louis Pasteur
Ans: D) Louis Pasteur
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What structure in the RNA polymerase of bacteria helps keep the transcription bubble open?
A. the rNTP entry channel B. the DNA entry channel C. the pin structure D. the RNA exit channel E. the RNA entry channel
Figure "A" in the accompanying figure is a ____
a. cotyledon b. cladode c. corm d. eudicot leaf e. monocot leaf
If a sperm cell contains 6 chromosomes, it must have come from an original parent cell that contained ________ chromosomes
A) 4 B) 6 C) 12 D) 24
Purple sulfur bacteria are organisms capable of photosynthesis. They get their name, in part, because they use H2S (hydrogen sulfide) instead of water during the light reactions. In what form would you expect to find sulfur (S) as a result of
photosynthesis in these bacteria? A) S2 B) SO2 C) CS2 D) C6H12S6