The secondary response in the B cell response occurs when memory cells bind to ________
A) antibodies
B) antigens
C) histamine
D) defensive proteins
B
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In lab, you are shown a freshly cut woody stem. Covering the stem are several cell layers, including cork, living parenchyma, and the cork cambium. These layers replace the function of a single epidermis layer that would be found in immature stems and nonwoody stems that don't have secondary growth. This collection of cell layers is the
A. endoderm. B. periderm. C. mesoderm. D. pachyderm. E. ectoderm.
Glycogen is a polysaccharide used for energy
storage by a. animals. b. plants. c. protistans. d. bacteria. e. fungi.
Large scale alterations of the amino acid structure in alpha globin are the cause of sickle cell anemia. Indicate whether the statement is true or false
The antiparallel arrangement within DNA molecules refers to
A. one helix strand that runs from the 5' to 3' direction and the other strand runs from the 3' to 5' direction. B. a purine always bonding to a pyrimidine. C. an original parent DNA strand and one newly synthesized DNA strand comprising a new DNA molecule. D. each base bonding at the 1' position of the sugar.