HIV is a
a. double-stranded DNA virus.
b. single-stranded RNA virus.
c. single-stranded DNA virus.
d. double-stranded RNA virus.
e. prion.
Answer: b. single-stranded RNA virus.
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Most body heat in endotherms is derived from _____ while most body heat in ectotherms is derived from ______.
A. metabolic processes, metabolic processes B. metabolic processes, their environment C. their environment, metabolic processes D. their environment, their environment E. fur, insulating scales
In the kidney, the specialized transport proteins that allow for very rapid fluid movement into or out of cells are known as
A) aquaporins. B) porins. C) ionophores. D) anion exchange proteins. E) osmosins.
The principal difference between endocrine glands and paracrine glands is that
a. paracrine glands are directly controlled by nerves. b. paracrine glands secrete steroid hormones, and endocrine glands secrete peptide hormones. c. endocrine glands act over a longer distance. d. paracrine glands are larger and easier to remove surgically. e. only the paracrine glands have a duct.
The letter “D” in the above figure represents
a. a kidney. b. a urethra. c. a urinary bladder. d. a ureter. e. water.