RNA polymerase recognizes the promoter region located on
A. DNA
B. tRNA molecule
C. mRNA molecule
D. Chromosome
E. Ribosome
Ans: A. DNA
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On average, only about ____ percent of the energy available at one trophic level is passed on to the next trophic level
a. 1 b. 5 c. 10 d. 90 e. 50
The cellular branch of adaptive immunity
A) is organized by T cytotoxic cells and carried out by T helper cells. B) does not involve a memory function. C) is based on antibody production. D) is organized by T helper cells and carried out by T cytotoxic cells. E) is based on the activity of both T and B cells.
You can use Hardy-Weinberg to calculate allele frequencies, but not genotype frequencies. (Hardy-Weinberg can be used to convert genotype frequency into allele frequency, and vice versa.)
A. true B. false
All steroids have ____
a. the same number of double bonds b. one or more fatty acids c. four rings of carbon to which other atoms are attached d. the same functional groups e. the same number and positions of double bonds