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Which of the following is not a salient ...

Which of the following is not a salient features of the Double-helix structure of DNA

A

pitch of the helix is `10^(-9)m`

B

there are roughly 10 bp in each turn

C

the distance a bp in a relix is approximately equal to 3.4 nm

D

The plane of one base pair stacks over the other in double helix

Text Solution

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The correct Answer is:
To solve the question regarding the salient features of the double-helix structure of DNA, we will analyze each option provided and identify which one does not correctly describe a feature of DNA's structure. ### Step-by-Step Solution: 1. **Understanding the Double-Helix Structure**: - DNA is composed of two strands that form a double helix. Each strand is made up of nucleotides, which consist of a sugar, a phosphate group, and a nitrogenous base. 2. **Identifying Key Features of DNA**: - The nitrogenous bases pair specifically: Adenine (A) pairs with Thymine (T) and Guanine (G) pairs with Cytosine (C). - The double helix has a specific pitch, which is the distance between one complete turn of the helix. This is approximately 3.4 nm. - Each complete turn of the helix contains about 10 base pairs. - The distance between adjacent base pairs in the helix is approximately 0.34 nm. 3. **Evaluating the Options**: - **Option 1**: "Pitch of the helix is 10¯⁹ m" - This is incorrect because the pitch of the helix is actually 3.4 nm (or 3.4 x 10^-9 m). - **Option 2**: "There are roughly 10 base pairs in each turn" - This is correct. - **Option 3**: "The distance between a pair in a helix is approximately equal to 0.34 nanometer" - This is also correct. - **Option 4**: "The plane of one base stack over the other in a double helix" - This statement is somewhat vague but generally refers to the stacking of bases, which is a feature of the double helix. 4. **Conclusion**: - The statement that is not a salient feature of the double helix structure of DNA is **Option 1**, which incorrectly states the pitch of the helix. ### Final Answer: **The option that is not a salient feature of the double-helix structure of DNA is: "Pitch of the helix is 10¯⁹ m."** ---
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