A primary immune response is the ________
A) production of primary-type antibodies in the first day of exposure to a microorganism
B) immune response elicited by the second exposure of lymphocytes to a particular antigen
C) immune response elicited by the first exposure of lymphocytes to a particular antigen
D) immune response elicited by the first exposure of memory cells to a particular antigen
C
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In a solution at pH 7.0, a polymer of lysine (polylysine) is a random coil with no secondary structure. In order for it to possibly assume an ?-helix structure, the pH of the solution must be:
A. 4 B 6 C. 8 D. 10 E. 12
Which of the following is a somatosense?
a. temperature b. pain c. vibration d. proprioception
____________________ covers and protects the outer surfaces of primary plant parts. Fill in the blank(s) with the appropriate word(s)
A bony skeleton, an operculum, and a swim bladder would be found in which group?
a) reptiles b) sharks c) amphibians d) ray-finned fishes e) mammals