If the concentrations of CO2 and O2 were equal in the atmosphere, rubisco would favor CO2 over O2 as a substrate by about 2000:1 at 25 °C. Why, in today's atmosphere (and at 25 °C), is the photosynthesis/photorespiration ratio of C3 plants only about 4:1?
A. O2 is much more abundant than CO2 in
today's atmosphere.
B. Rubiscos that are more selective for CO2
are slower.
C. O2 is continually produced in the leaves of
C4 plants.
D. RuBP reacts readily with O2.
A
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In mitosis, the chromosomes move to opposite poles during
a. anaphase. b. metaphase. c. prophase. d. telophase
Scanning electron microscopy (SEM) is especially suited to
A) observing living specimens. B) examining internal cellular structure. C) creating a sense of depth. D) both observing living specimens and creating a sense of depth. E) simultaneously observing living specimens, examining internal cellular structure, and creating a sense of depth.
Which of the following groups belong to the domain of the prokaryotes?
a. bacteria b. protists c. fungi d. animals
Archaeal cell walls have the same chemical composition as bacterial cell walls.
a. true b. false