During a year, plants never use 100% of the incoming solar radiation for photosynthesis. What is a reasonable explanation for this?
I) Plants cannot photosynthesize as well during winter (in cold winter climates).
II) Plants cannot photosynthesize as well on cloudy days.
III) The pigments that drive photosynthesis respond to only a fraction of the wavelengths that are available.
A) only I
B) only II
C) only III
D) only II and III
E) I, II, and III
Answer: E
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Which of the following is true regarding bacterial genetics?
A. Bacteria are usually diploid organisms B. Bacteria primarily reproduce sexually C. The patterns of inheritance in bacteria are studied using different mechanisms than eukaryotes D. Bacteria generally have linear chromosomes
The active site for carboxypeptidase
A) contains amino acids that are contiguous to one another along the primary sequence of the protein. B) uses iron as the prosthetic group. C) involves only 6 out of a total of 307 amino acids. D) contains a glutamate residue at position 69. E) is formed by the interaction of two polypeptide chains.
The conversion of a diamond into graphite is a spontaneous reaction. Why are most women walking around with
diamond rings and not graphite rings?
a. inorganic substances, like diamonds, do not react like organic substances b. the transition state is very stable c. the energy of activation is very high d. the free energy of this reaction is too low e. the free energy of this reaction is too high
Which of the following is an incorrect match?
a. pea pods; dehiscent b. strawberry; berry c. cherry; drupe d. corn; indehiscent e. tomato; berry