Which of the Following Statements About DNA Is True

question 39

Multiple Choice

Which of the following statements about DNA is true?

• A) The DNA molecule is circular, with the nucleotide bases located in the center of the circle.
• B) The DNA molecule contains only four different types of bases, regardless of what species is involved.
• C) The DNA molecule is identical for every known species, and species differences are coded on molecules that lay alongside the DNA.
• D) The pairing of adenine, thymine, cytosine, and guanine follows a random sequence, with all four base pairs combining with each other an equal percentage of times.

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Definitions:

Chemical Changes

Reactions that result in the transformation of substances into one or more different substances, involving the making and breaking of chemical bonds.

Top-down Processing

A cognitive process that uses context and pre-existing knowledge to understand information.

Constriction

The act or process of drawing together or becoming narrower; it can apply to physical objects, bodily processes, or even psychological states.

Accommodation

In psychology, the process of adjusting existing cognitive structures in response to new experiences; in vision, the process by which the eye's lens changes shape to focus near or far objects on the retina.