In vertebrates, neural crest cells give rise to the nerves, head muscles, and cranium. Indicate whether the statement is true or false


True

Biology & Microbiology

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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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology

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

Biology & Microbiology