Which of the following mechanisms normally repairs pyrimidine dimers?
A) base-excision repair
B) light repair
C) single-strand repair
D) error-prone repair
E) SOS response repair
B
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The fluid portion of blood is called ________.
Fill in the blank(s) with the appropriate word(s).
A C4 plant is different from a C3 plant because a C4 plant:
A) stores CO2 in four-carbon molecules before the CO2 enters the Calvin cycle. B) can leave its stomata open longer without ill effect. C) does not have bundle-sheath cells. D) performs photorespiration.
During conscious quiet rest, the brain is emitting ____
a. alpha waves b. beta waves c. delta waves d. gamma waves e. rapid, irregular waves
Why are massive main-sequence stars not likely to have planets that contain life?
a. The life zones around these stars is too small. b. These stars would sweep away all of the material from which planets could form. c. These stars are too hot to allow water to exist as a liquid on any planets that might form. d. These stars are on the main sequence for too short a time to allow life to evolve. e. These stars are almost always binaries and planetary orbits are unstable around binaries.