You are a virologist studying a particularly pathogenic virus that infects sea turtles. In the course of your research, you discover that the virus is destroyed by a protein-digesting enzyme. The structure most vulnerable to this enzyme must be the viral
a. membrane.
b. envelope.
c. DNA.
d. capsid.
D
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The constant region of an antibody molecule is
A) the binding site for antigens. B) part of the heavy chains only. C) similar in all antibody molecules. D) the binding site for two antigens.
hemoglobin?
a. It is a protein. b. It contains iron. c. It has the same function in mollusks, annelids, and some crustaceans as it has in humans. d. Clams, like humans, carry hemoglobin in red blood cells. e. It is comparable in function to hemocyanin
Which statements are true for chloroplasts?
a) They contain the green pigment chlorophyll. b) They are the sites of reactions that convert solar energy into chemical energy. c) Their inner membrane has infoldings called cristae. d) Their matrix contains enzymes that function in cellular respiration. e) They are the sites of reactions that convert chemical energy to ATP. f) They have membranous sacs called thylakoids that are surrounded by a fluid called stroma.
Ever since the antibiotic drug penicillin was discovered in 1928, the incidence of resistant bacteria has steadily increased as a direct result of
(a). biodiversity. (b). natural selection. (c). homeostasis. (d). development. (e). reproduction.