The membranes within the kidney tubules can be described as

a. pseudo-permeable.
b. impermeable.
c. semi-permeable.
d. permeable.


c. semi-permeable.

Biology & Microbiology

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In the United States, parathion is the most widely used member of a class of ____

a. organophosphate herbicides b. organophosphate insecticides c. chlorophosphate fungicides d. chlorophosphate herbicides e. chlorophosphate insecticides

Biology & Microbiology

Which of the following forms the skeleton of invertebrate chordates?

a. pharynx b. neural crest c. oral hood d. notochord e. cranium

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Gametogenesis is the term for

A.) the production of gametes. B.) the fertilization of eggs. C.) the development of polar bodies. D.) the movement of sperm.

Biology & Microbiology

A population's survivorship curve is a downward-sloping straight line when:

a. the birth rate exceeds the death rate. b. the mortality rate increases with age. c. the mortality rate is constant regardless of age.

Biology & Microbiology