Which group of gymnosperms diverged first?
A. ginkos
B. conifers
C. gnetophytes
D. cycads
E. angiosperms
D
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Which of the following has the highest photosynthetic efficiency in hot and dry environments?
A. C3 plants B. C4 plants C. plants undergoing photorespiration D. plants that use oxygen to produce sugars E. plants that only produce sugar in the dark
The part of the ear actually responsible for
hearing is the
a. hammer, anvil, and stirrup. b. cochlea. c. vestibular apparatus. d. organ of Corti. e. combination of the organ of Corti and the vestibular apparatus
Which of the following is a character in
phylogeny? a. number of digits b. DNA sequence for a gene c. amino acid sequence of an enzyme d. number of petals e. all of these
Molecular charge is an important characteristic influencing protein migration on a gel. What accounts for the variation in the molecular charge of proteins?
A) the intronic sequences of the protein B) the amino acid composition of the protein C) the negative charge of the sugar-phosphate backbone D) the amount of protein loaded into the wells of the gel E) the presence of secondary structures in the protein