Which of the Following Is a Purine Base

question 9

Multiple Choice

Which of the following is a purine base?

• A) uracil
• B) cytosine
• C) thymine
• D) adenine

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Definitions:

Ultraviolet Light

A type of electromagnetic radiation with a wavelength shorter than that of visible light but longer than X-rays.

Absolute Threshold

The minimum intensity of a stimulus that one can detect 50% of the time.

Brightness

Lightness or luminance; the dimension of visual experience related to the amount (intensity) of light emitted from or reflected by an object.

Dark Room

A room used in photography processing where photographic materials are handled in complete darkness or under a safelight.