Where do mesophyll cells usually obtain CO2 for photosynthesis?
A. the air spaces that surround them
B. the xylem
C. other mesophyll cells
D. from cellular respiration
E. None of the answer options is correct.
A
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Which of the following is true of eudicots but not monocots?
A. Eudicots have flower parts usually in multiples of 4 or 5. B. Eudicots have true seed leaves but monocots do not. C. Eudicots have vascular bundles scattered in their stems. D. Eudicots have venation that is parallel to the leaf axis. E. Eudicots have stomatal pores but monocots do not.
A third mutant allele of gene B (allele b3) causes the frogs' eyes to become green, instead of their normal red color. Normally, gene B effects only skin color. What term describes this allele?
A) Hypermorphic B) Neomorphic C) Hypomorphic D) Amorphic E) Haploinsufficient
Most kidney problems in the United States result
from a. viral infections. b. diabetes mellitus or high blood pressure. c. arsenic or lead poisoning. d. chronic overdoses of aspirin. e. accidental inhalation of pesticides.
Which of the following LEAST belongs with the others?
A. UvrA protein B. UvrC protein C. nucleotide excision repair D. thymine dimer E. direct repair