pH is

a. a measure of phosphorous concentration.
b. a measure of hydrogen ion concentration.
c. measured by counting the number of different kinds of aquatic insects.
d. measured on a scale from 1 to 100


a

Biology & Microbiology

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Gas exchange occurs where?

a. trachea b. pharynx c. alveoli d. bronchi

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The figure is a __________ microscope

photomicrograph. a. standard light b. phase contrast c. Nomarski process light d. transmission electron e. scanning electron

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The peripheral nervous system consists of the brain and spinal cord

Indicate whether the statement is true or false

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During development, many genes act in such a way as to decrease the number of alternative developmental pathways that a cell can follow. Usually there are two alternative developmental paths for a cell to follow. What is the term given to genes that act

in this fashion? What will be an ideal response?

Biology & Microbiology