Which statement about DNA forms being right-handed is true?

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Study for the Biochemistry Module 6 Exam. Study with flashcards and multiple choice questions; each question includes hints and explanations. Gear up to ace your test!

Multiple Choice

Which statement about DNA forms being right-handed is true?

Explanation:
DNA helices come in different geometries with distinct handedness. B-DNA, the form that predominates in physiological conditions, is right-handed. A-DNA is also right-handed, though it is more compact and forms under dehydrating conditions or in DNA–RNA hybrids. Z-DNA, on the other hand, is left-handed and tends to form under high salt or specific sequence patterns. Because both B-form and A-form are right-handed while Z-form is left-handed, the statement that B-form and A-form are right-handed is true.

DNA helices come in different geometries with distinct handedness. B-DNA, the form that predominates in physiological conditions, is right-handed. A-DNA is also right-handed, though it is more compact and forms under dehydrating conditions or in DNA–RNA hybrids. Z-DNA, on the other hand, is left-handed and tends to form under high salt or specific sequence patterns. Because both B-form and A-form are right-handed while Z-form is left-handed, the statement that B-form and A-form are right-handed is true.

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