What are the regions where DNA-binding proteins can make direct contact with exposed nucleotides?
What will be an ideal response?
major and minor grooves
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Humans gain the least amounts of water by what
route(s)? a. metabolism b. ingestion of liquids c. ingestion of solids d. ingestion of liquids and of solids e. all of these contribute equal amounts of water
Which of the following statements about RNA polymerase in bacteria is INCORRECT?
A. It binds the promoter region of a gene. B. It dissociates from the DNA at the terminator. C. It is bound to a sigma factor during initiation of transcription. D. It synthesizes RNA. E. It catalyzes the addition of nucleotides to the 5?end of a growing RNA strand.
Epinephrine raises blood pressure by ____
a. increasing the strength and rate of the heartbeat b. decreasing the strength and rate of the heartbeat c. stimulating vasodilation d. reducing vasodilation e. decreasing blood flow to the heart, skeletal muscles, and lungs
A vasectomy is a surgical procedure in which the vas deferens are severed, and then sealed with a laser. How would this cause sterility?
A. Sperm cannot be produced by meiosis. B. Sperm cannot be produced by mitosis. C. Sperm cannot move to the urethra. D. A man cannot get an erection. E. The testes stop producing testosterone.