The release of stored memory B and T cells in response to a second encounter with an antigen is called ________
A) secondary response
B) innate response
C) immunity
D) primary response
A
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Which of the following is NOT true of hydrogen bonds?
a. They are quite weak. b. The hydrogen is slightly positive. c. They are uncommon in macromolecules. d. They form in salts such as NaCl. e. They always involve hydrogen.
What kind of skeletons do arthropods have?
a. exoskeletons b. endoskeletons c. hydrostatic skeletons d. segmental skeletons e. none of these
The only group of plants that produce flowers are the ____
a. horsetails b. ferns c. bryophytes d. angiosperms e. gymnosperms
A fruit fly population has a gene with two alleles, A1 and A2. Tests show that 70% of the gametes produced in the population contain the A1 allele. If the population is in Hardy-Weinberg equilibrium, what proportion of the flies carry both A1 and A2?
A) 0.7 B) 0.49 C) 0.21 D) 0.42 E) 0.09