The type of chemical bond linking amino acids together is a(n)
A. glycosidic bond.
B. peptide bond.
C. hydrogen bond.
D. ionic bond.
E. ester bond.
Answer: B
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If a male silk moth lacked a receptor for bombykol, what deficit would likely be observed?
A. The male would have difficulty locating a mate. B. The male would have difficulty locating food. C. The male would have difficulty responding to alarm signals. D. The male would have difficulty attracting a female moth. E. The male would have difficulty molting.
The primary function of plasma cells is to
A) secrete antibodies. B) remember immune responses. C) secrete cytokines. D) protect phagocytes.
After a biology field trip, you make a thin section of a flowering plant stem. You observe these two main sets of cells: the lower set of cells is large, has thick walls, and tests positive for the lignin molecule, while the smaller, but uniform red cells do not have lignin. From this evidence, you conclude that the larger cells with lignin are
A. rhizoids. B. phloem. C. xylem. D. cuticles. E. stomata.
Infant mortality decreased as the Industrial Revolution occurred. What situation resulted from the decrease in infant mortality?
A. boom and bust cycles of the population growth rate B. an increase in the population growth rate C. a stabilization of the population growth rate D. a decrease in the population growth rate