Which statement about the humors of the eye is true?
A) The vitreous humor fills the chamber behind the lens.
B) The vitreous humor circulates throughout the eye.
C) The aqueous humor is jellylike.
D) The humors help keep the outside of the eye moist.
Answer: A) The vitreous humor fills the chamber behind the lens.
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Ti plasmids in the species Agrobacterium tumefaciens
A. carries the genes needed for formation of bacteroids. B. is required for nitrogen fixation. C. causes the formation of tumors. D. carries the genes needed for root nodule development.
Answer the following statements true (T) or false (F)
1. "Vasodilation" refers to a decrease in arteriole diameter. 2. The same hormone can cause vasoconstriction in some arterioles and vasodilation in others. 3. Rises in blood pressure with large increases in cardiac output are limited by decreases in total peripheral resistance. 4. A reduction in blood pressure due to hemorrhage would be expected to increase stimulation of baroreceptors.
Acromegaly is the result of excessive secretion of which hormone by adults?
a. melatonin b. triiodothyronine c. thyroxine d. testosterone e. growth hormone
The enzyme ________ is used by retroviruses to transfer information from RNA to DNA
a. RNA polymerase b. reverse transcriptase c. integrase d. helicase