Which enzyme is active in DNA replication?
A) DNA polymerase
B) RNA polymerase
C) reverse transcriptase
D) aminoacyl-tRNA synthetase
E) RNase
A
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. If the side chains of amino acids contain carboxyl (-COOH) groups, they
A. contribute a positive charge to the amino acid at pH 10. B. contribute a negative charge to the amino acid at pH 10. C. have no effect on the charge of the amino acid at pH 10. D. are considered acidic amino acids. E. contribute a negative charge to the amino acid at pH 10 AND are considered acidic amino acids.
Denaturation of proteins may result in all of
the following EXCEPT a. breakage of hydrogen bonds. b. loss of three-dimensional structure. c. removal of R groups from amino acids. d. alteration of enzyme activity. e. endangerment of a cell's life
The taxonomic category that includes species of apes, humans, and their ancestors is the ___________
A. hominids D. hominanies B. hominins E. homanities C. hominoids
What is contained within the xylem sap of a plant?
A) water only B) water and dissolved minerals only C) water and sugars produced from photosynthesis only D) water, dissolved minerals, and sugars