When the glottis becomes narrower,

A. the volume of sound decreases.
B. the volume of sound increases.
C. the pitch of sound goes up.
D. the pitch of sound goes down.
E. all sound ceases completely.


Answer: C

Biology & Microbiology

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A molecular biologist treats a 600-kb length of linear DNA with HindIII restriction endonuclease.  Following gel electrophoresis, the biologist observes that there is only one band on the gel corresponding with the migration distance of the 200-kb molecular weight marker.  Assuming that no procedural errors were made, what can be concluded from these results?

A. There were no HindIII recognition sequences present in the original DNA. B. Three HindIII recognition sequences were present in the original DNA. C. One HindIII recognition sequence was present in the original DNA. D. Two HindIII recognition sequences were present in the original DNA. 

Biology & Microbiology

Ferroplasma acidarmanus is ________.

A. capable of growth at pH 0 B. lacks a cell wall C. capable of oxidizing iron D. All of the choices are correct.

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Which tissue type will move the body? a. Muscle b. Nerve c. All of these choices

d. Epithelial e. Connective

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What event enabled the rats to become

resistant to warfarin?

a. mutation of a gene associated with the recycling of vitamin A b. mutation of a gene associated with vitamin K c. mutation of a gene associated with blood clotting d. mutation of a gene associated with blood production e. more than one of these enabled rats to become resistant to warfarin

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