________ radiation excites atoms to a higher energy state within molecules such as DNA, which leads to the formation of pyrimidine dimers.

A. Gamma
B. Particle
C. Ultraviolet
D. Infrared
E. Ionizing


Answer: C

Biology & Microbiology

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Which type of tissue performs photosynthesis in leaves?

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In RNA, the base ____ takes the place of the base thymine

a. deoxyribose b. ribose c. pentose d. guanine e. uracil

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Which time period of Earth represents when evolution was progressing at the most rapid rate, as evidenced by fossils

such as those of the Burgess Shale? a. Silurian period b. Cambrian period c. Devonian period d. Ordovician period e. Carboniferous period

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The diagnostic procedure that images the structures of the blood vessels and the flow of blood through these vessels is known as _________ .

Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology