DNA contains all of the following nitrogencontaining

bases EXCEPT
a. adenine.
b. uracil.
c. guanine.
d. adenine.
e. thymine.


Answer: b

Biology & Microbiology

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Fill in the blank(s) with correct word

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Animals are thought to have descended from choanoflagellate protists. Which poriferan cell type lends evidence to this claim?

A. Amoebocyte B. Gamete C. Choanocyte D. Spicule

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The buccal cavity is another name for the:

A. mouth. B. stomach. C. rectum. D. small intestine. E. anus.

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Which of the following is(are) associated with balance?

a. semicircular canals b. cochlea c. incus, malleus, and stapes d. eardrum and ear canal

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