Select the phrases that accurately describe properties of the most common form o

Question

Select the phrases that accurately describe properties of the most common form of the DNA double helix. There is more than one correct answer. Select all that apply. -DNA contains equal amounts of adenine and thymine, and equal amounts of cytosine and guanine. -The nitrogenous bases are exposed to the solvent, whereas the sugar-phosphate backbone of each nucleotide strand is in the interior of the double helix.. -A helical turn consists of about 10 base pairs. -Base pairs have a spacing of 20 Å . -The phosphodiester bonds between nucleotide residues run in opposite directions in the two strands.

Explanation / Answer

DNA contains equal amounts of adenine and thymine, and equal amounts of cytosine and guanine.

A helical turn consists of about 10 base pairs.

The phosphodiester bonds between nucleotide residues run in opposite directions in the two strands.

[Adenine pairs with thymine while cytosine pairs with guanine, so adenine = thymine and cytosine = guanine]

[sugar-phosphate backbone is polar and forms the backbone of double helix while nitrogenous bases are non-polar and are present in interior of the double helix.]

[Base pairs have spacing of 3.4 A°.]

[Both the strands of DNA run antiparallel to each other.]

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