Breathing rates are automatically increased when _____ levels are _____

a. oxygen; high
b. carbon dioxide; high


c. oxygen; low
d. carbon dioxide; low
e. ATP; low


ANSWER: b

Biology & Microbiology

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Which number identifies the site where the transcriptional complex begins to form?

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One characteristic that makes Caenorhabditis elegans attractive for developmental studies is:

a. its small, transparent body. b. the extensive number of genes shared with humans. c. the developmental defects that occur in this organism. d. the close evolutionary relationship between this mammal and humans. e. the presence of zygotic segmentation genes, similar to those found in humans.

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Organisms that can interbreed with each other in nature but are genetically isolated from all other organisms are a:

A) species. B) clone. C) genus. D) family.

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Which cells mature in the thymus gland?

a. T cells b. mast cells c. macrophages d. neutrophils e. eosinophils

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