An enzyme that catalyzes the cutting and resealing of DNA, and is translated from insertion sequences, is
A) RNA polymerase.
B) DNA ligase.
C) DNA helicase.
D) transposase.
E) DNA polymerase.
D
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Approximately what volume of blood in the G.I. tract will result in recognizable melena?
Consider solution A (pH 6) and solution B (pH 9). Which of the following statements is CORRECT?
A) Solution A is 3 times more acidic than solution B. B) Solution A is 300 times more acidic than solution B. C) Solution B is 1,000 times more alkaline (basic) than solution A. D) Solution B is 3,000 times more alkaline (basic) than solution A.
Fertilization of an ovum occurs in the
A. uterus. B. ovary. C. oviduct. D. vagina. E. ovarian follicle.
A hard porous test (shell) is characteristic of which protist group?
a. Rhizarians b. Forams c. Cercozoans d. Euglenozoans e. Choanoflagellates