Denitrifying Bacteria and Archaea are chemoorganotrophs that grow by anaerobic respiration using ________ and producing ________
a. nitrate (NO3–) or nitrite (NO2–) / dinitrogen gas (N2) or nitrous oxide (NO)
b. dinitrogen gas (N2) or nitrous oxide (NO) / nitrate (NO3–) or nitrite (NO2–)
c. dinitrogen gas (N2) or nitrous oxide (NO) / ammonia (NH3) or CO2
d. nitrate (NO3–) or nitrite (NO2–) / ammonia (NH3) or water
Answer: A
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Why is it a good idea for a bacterial cell to be able to utilize glucose FIRST as an energy source (until it's used up), THEN switch to lactose?
A. Glucose is an easier compound to break down and obtain energy from than lactose. B. Lactose cannot be used by bacterial cells as an energy source. C. It's about conservation of energy-why expend the energy to make the extra enzymes for breaking down lactose when glucose is right there and doesn't need the extra enzymes for breakdown. D. Glucose provides 10x as much energy when broken down as lactose. E. Glucose is no easier compound to break down and obtain energy from than lactose AND It's about conservation of energy-why expend the energy to make the extra enzymes for breaking down lactose when glucose is right there and doesn't need the extra enzymes for breakdown.
The thymus plays an important role in ____
a. secretion of thyroxine b. immune function c. adrenal function d. production of testosterone e. sleep-wake cycles
Reversible phenotypic changes in an individual organism in response to changing environmental conditions are referred to as ________
Fill in the blank(s) with correct word
In the Ames test, what happens when his- bacteria are exposed to a chemical and experience a higher level of growth than the control?
A) The his- bacteria now utilized histidine from the media. B) The reversion rate is lower than seen for spontaneous mutations. C) The his- bacteria utilized DNA repair tools to fix the mutation. D) A reversion mutation allowed the his- bacteria to regain their ability to make histidine (revert to his+). E) The tested chemical is regarded as a non-mutagen.