There are how many different kinds of RNA
nucleotides?
a. 3
b. 4
c. 5
d. 6
e. 12
Answer: b
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Which of the following statements explains why all of the F1 females from a cross between a red-eyed homozygous female and a white-eyed male are heterozygous?
A. The male parent provides them with a white-eye allele on the X and a red-eye allele on the Y. B. The male parent provides them with a white-eye allele on the X, and the female parent provides them with a red-eye allele on the Y. C. The male parent provides them with a white-eye allele on the X, and the female parent provides them with a red-eye allele on the X. D. The female parent provides two X chromosomes to each daughter who both carry the red-eye allele. E. None of the answer options is correct.
The job of a natural killer cell is to:
A. release histamine. B. destroy invading pathogens through phagocytosis. C. destroy infected or abnormal host cells. D. trigger inflammation.
The continuously sparking electrodes in the apparatus used in the Miller-Urey experiment simulated ____
a. solar energy b. lightning strikes c. volcanic eruptions d. radioactivity e. hydrothermal vents
What happens to a cell that is carrying damaged DNA if both of its TP53 alleles become inactivated?
a) It lacks the genetic integrity required for controlled growth. b) It lacks the genetic integrity required for uncontrolled growth. c) It fails to be destroyed.