How do the secreted antibodies from a plasma cell differ from the cell-surface antibodies of a memory cell?
A. in the specificity of the hypervariable
domain
B. by the absence of a hydrophobic domain in
the constant region
C. through the removal of the constant region
D. by the absence of a hydrophilic domain in
the constant region
B
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Which one of the following statements is TRUE regarding parathyroid hormone (PTH)?
A) It stimulates the release of growth hormone. B) It is released when blood calcium levels are high. C) It has the same function as calcitonin. D) It causes the breakdown of bone. E) It causes decreased activity of osteoclasts.
Pollutants such as ________ may affect the reproduction of organisms
A) carbon monoxide B) bisphenol A C) water D) nitrogen E) sulfur
Gene flow, defined as the movement of genes from one population to another, can take place by migration as well as
A. mating between individuals of adjacent populations. B. mating with certain trait-containing individuals. C. mating with dominant phenotypes. D. removing the barriers between the populations. E. physical movement of genes within an individual by transposons.
The "one-gene/one-enzyme" hypothesis was proposed by
A. Beadle and Tatum. B. Watson and Crick. C. Garrod. D. Franklin. E. Griffith.