Gene regulation can involve a protein repressor that blocks _____ from initiating transcription.
A) DNA polymerase III
B) RNA polymerase
C) DNA polymerase I
D) rRNA
E) mRNA
B) RNA polymerase
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________ is a rare, intramolecular posttranslational process that allows for self-catalytic removal of specific amino acid sequences.
Fill in the blank(s) with the appropriate word(s).
Which cells make you immune to a disease to which you were previously exposed?
1.effector cells 2.memory cells 3.dendritic cells 4.phagocytes 5.fibroblasts
Polyarthritis in pigs, sheep, and turkeys may be associated with infection of which of the following bacteria?
A. Listeria monocytogenes B. Erysipelothrix rhusiopathiae C. Bacillus anthracis D. Bacillus porcini
A photograph of a Victorian trophy room shows the heads of 15 species of hoofed mammals, all shot within a day's walk of a single hunting camp in Africa. This camp was probably located in
A) tropical rain forest. B) chaparral. C) savanna. D) desert.