The class of organic molecules characterized by their insolubility in water is the
a. carbohydrates.
b. lipids.
c. proteins.
d. ions.
e. nucleic acids.
Ans: b. lipids.
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Despite the enormous amount of solar energy that plants are exposed to, photosynthesis is only able to transform about 1-2% of that energy into stored chemical energy. Which of the following contributes to this inefficiency?
A. the production of 2-phosphoglycolate B. the strong preference of rubisco for oxygen over carbon dioxide C. the presence of xanthophylls and other pigments besides chlorophyll in the thylakoid membrane D. the presence of two photosystems (I and II) in the thylakoid membrane that compete for high energy electrons
The most common etiologic agent of community-acquired pneumonia in adults older than 30 years of age is ___ pneumoniae
a. Mycoplasma b. Chlamydophila c. Streptococcus d. Klebsiella
Which of the following is a property of water?
A) It has a high capacity for heat. B) It is not a common reactant in metabolic reactions. C) It is not a good solvent. D) It is liquid in a very narrow temperature range. E) It is a nonpolar molecule.
Photorespiration occurs most on:
A) hot, dry days. B) cold, dry days. C) cloudy, rainy days. D) hot, humid days. E) cool, cloudy days.