A distinctive red rash on the cheeks with an otherwise mild illness is most likely
A) rubella. B) measles. C) fifth disease. D) roseola. E) chickenpox.
Answer: C
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Plant pathology grew in importance as a field of study after it was shown that the Irish potato blight was caused by
A. bacteria. B. viruses. C. fungi. D. amoeboid protozoa. E. water molds.
Why does NADH produce more energy than FADH2?
a. FADH2 donates electrons to protein complex III as opposed to complex II. b. FADH2 requires more ATP to produce it and gives more energy back. c. NADH and FADH2 are synthesized in different steps of cellular respiration. d. NADH has a high free energy and can be oxidized more readily than FADH2. e. NADH supplies fewer electrons that are of a higher energy state than FADH2.
How does gibberellin actually work?
A. In the presence of blue light, it triggers additional photosynthesis and growth. B. In the presence of light, it increases the turgor pressure of the cell and accelerates growth. C. In the presence of unidirectional light, it moves to the shady side and activates an ATP-driven proton pump that results in weakened cell walls and eventual elongation. D. In the presence of light, it increases the formation of additional DNA that codes for additional plant structures. E. It attaches to a plasma membrane receptor and results in gene activation to produce the enzyme amylase that releases sugars for additional cell growth, division, and elongation.
When a chemical reaction is at equilibrium, which of the following statements is always TRUE?
a) the equilibrium constant (keq) equals 1 b) the ratio of the concentrations of reactants and products equals 1 c) the rate of the forward reaction is equal to the rate of the backward reaction d) all of the choices are correct