Oxygen kills some bacteria because of the production of _______
a. carbon dioxide
b. oxygen free radicals
c. a sodium cation
d. water
Answer: b. oxygen free radicals
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At which time period(s) during PCR thermocycling is/are hottest in temperature?
A) during DNA denaturation B) during primer annealing C) during primer extension/elongation D) Both the first and last cycles are hotter in temperature than all other cycles.
Before a sperm can compete in fertilization, it must undergo a maturation process in the female
reproductive tract known as: a. the acrosome reaction. b. the cortical reaction. c. spermatogenesis. d. determination. e. capacitation.
Insulin is produced by the:a
beta cells of the islets of Langerhans. b. alpha cells of the islets of Langerhans. c. cortical cells of the adrenal gland. d. neurons in the hypothalamus. e. lobules of the liver.
How long are restriction endonuclease recognition sequences?
A) 4-12 nucleotides B) 5 to 3 nucleotides C) Length can vary by 100 nucleotides, depends on organism