Initiation, elongation, and termination are the three main steps in
a. translation only.
b. transcription and translation.
c. transcription only.
d. photosynthesis
Answer: b. transcription and translation.
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It is difficult to estimate when cyanobacteria appeared on Earth using evidence from the oxidation state of the Earth's crust, because
A) several abiotic reactions could have formed Fe3+. B) there are multiple forms of anoxygenic photosynthesis. C) there are multiple groups of oxygenic photosynthetic bacteria. D) several ancient anaerobic metabolisms form Fe3+.
Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Therefore, which of the following can be true?
A) Molybdenum atoms can have between 50 and 58 neutrons. B) Molybdenum atoms can have between 50 and 58 protons. C) Molybdenum atoms can have between 50 and 58 electrons. D) Isotopes of molybdenum have different numbers of electrons.
Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline. This is an example of
A) competitive inhibition. B) noncompetitive inhibition. C) feedback inhibition. D) irreversible inhibition.
The thermal death time for E. coli at 63°C was determined to be 20 minutes. Predict the affect on thermal death time if the temperature is increased to 67°C.
A. The thermal death time will be longer. B. There will be no change in thermal death time. C. The thermal death time will be shorter. D. There is not enough information to make this prediction.