Why are vasodilation and vasoconstriction the main mechanisms to change blood flow?

A. Blood vessel length is relatively fixed and has no effect on blood flow.
B. Blood hematocrit has no effect on blood flow.
C. Leakage of fluids from the capillaries has no effect on blood flow.
D. Sympathetic activation has no effect on blood flow.


A. Blood vessel length is relatively fixed and has no effect on blood flow.

Biology & Microbiology

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The flu differs from a cold in that the flu ________.

A. responds to streptomyocin B. is more virulent C. infects only the upper respiratory tract D. two of the above

Biology & Microbiology

What may result if a mutation occurs in a gene?

A) There may be no effect on the protein encoded by the gene. B) A nonfunctional protein may be created. C) A protein with a new function will not be formed. D) The phenotype of the organism may be changed.

Biology & Microbiology

Which of the following is required for transposition?

A. F+ plasmid B. bacteriophage C. inverted repeat D. donor cell E. competence

Biology & Microbiology

Enzymes that catalyze removal of carbon dioxide from a substrate are called

A. ligases. B. phosphotransferases. C. decarboxylases. D. aminotransferases. E. oxidoreductases.

Biology & Microbiology