Pasteur used swan-neck flasks in his experiments to prove that
A. dust in air was a source of living microorganisms.
B. microorganisms could cause disease.
C. microorganisms could be grown in laboratory infusions.
D. air had "vital forces" capable of spontaneous generation.
E. microbial fermentation could be used to make wine.
Answer: A
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A) the cleavage furrow of eukaryotic animal cells B) the cell plate of eukaryotic plant cells C) the mitotic spindle of eukaryotic cells D) the microtubule-organizing center of eukaryotic cells
The component(s) of E. coli RNA polymerase responsible for promoter recognition is/are referred to as:
A. sigma factor. B. the TATA box. C. the mediator complex. D. an enhancer. E. transcription factors.
Approximately how many people exposed to cholera bacteria actually become ill?
a. one in ten b. 100 in 500 c. three in five d. 50 in 100 e. just about everybody
The base content of a sample of DNA is as follows: A = 31%, G = 31%, T = 19%, C = 19%. What conclusion can be drawn from this information?
What will be an ideal response?