The most important aspect of agar that makes it a useful ingredient for solidifying media for bacterial culture is
A. It provides an excellent carbon and energy source for bacteria.
B. Bacteria are unable to break it down so it stays solidified.
C. It melts at 100oC and solidifies at temperatures below 50oC.
D. It provides an excellent nitrogen source for bacteria.
Answer: B
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One effect of auxin, which triggers the elongation of cells, is to affect cell walls by increasing their
A. plasticity. B. permeability. C. water solubility. D. thickness. E. stiffness.
N-fixing bacteria
What will be an ideal response?
Hypothesis I: A flavin pigment absorbs blue light; this pigment then activates the proton pump.Hypothesis II: When CO2 concentration rises, a membrane receptor inactivates the proton pump.Stomata rhythm in wheat under continuous light at 25°C.
A. Supports both hypothesis I and II. B. Supports only hypothesis I. C. Supports only hypothesis II. D. Supports neither hypothesis.
The LEAST significant complication associated with damage to the skin following a burn injury is:
A) decreased melanin granules. B) disturbances in fluid balance. C) difficulty with thermoregulation. D) susceptibility to bacterial invasion.