DNA and RNA are different types of nucleic acid polymer. Which of the following is true of DNA but not true of RNA?
(a) It contains uracil.
(b) It contains thymine.
(c) It is single-stranded.
(d) It has 5?-to-3? directionality.
(b)
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The cause of p53-related cancers is
A) fetal cells that remain in a child or adult, dividing too frequently. B) continual expression of the telomerase gene, which keeps cells dividing. C) deletion of cell cycle checkpoint genes. D) failure to repair damaged DNA, allowing the cell to continue dividing.
Blood moves through the structure indicated by
a. A. b. B. c. C. d. D. e. E.
When two true-breeding parental genotypes are crossed, the offspring are referred to as the
A. F1 generation. B. true recessives. C. F2 generation. D. test cross.
The process by which living organisms maintain a fairly constant internal environment despite changes in the external environment is known as
A) metabolism. B) biology. C) homeostasis. D) evolution. E) chemistry.