In vertebrates, neural crest cells give rise to the nerves, head muscles, and cranium. Indicate whether the statement is true or false
True
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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
A and B are linked genes. In a study of 100 offspring, 94 had parental genotypes for A and B, while 6 were recombinants. A and B are ________ map units apart.
A) 4 B) 6 C) 9.4 D) 94
If a large 10-km asteroid or comet struck the Earth in the ocean floor, I. large amounts of molten rock would rain down on Earth and cause massive forest fires. II. giant tidal waves would result III. after effects would cause the deaths of most animal life on the planet. IV. thick clouds of dust would form and block out the Sun for an extended period
a. I & IV b. II & III c. I, II, & III d. I, II, III & IV e. II, III, & IV
Carbon is introduced into the atmosphere by
all EXCEPT which of the following means? a. respiration b. diffusion c. burning of fossil fuels d. wind erosion of rocks e. tilling of soil