Which answer choice below correctly describes the structure of DNA?(1 point)

Question

Responses

Sugar-nitrogen base backbone with phosphates in the middle forming a double helix.
Sugar-nitrogen base backbone with phosphates in the middle forming a double helix.

Nitrogen bases on the outside with sugar-phosphate in the middle of a double helix.
Nitrogen bases on the outside with sugar-phosphate in the middle of a double helix.

Sugar-phosphate backbone with nitrogen bases coming off a single helix.
Sugar-phosphate backbone with nitrogen bases coming off a single helix.

A sugar-phosphate backbone with nitrogen bases in the middle forming a double helix.
A sugar-phosphate backbone with nitrogen bases in the middle forming a double helix.

Answer 1

The correct answer choice is:

A sugar-phosphate backbone with nitrogen bases in the middle forming a double helix.

This describes the classic structure of DNA, where the sugar-phosphate backbone runs along the outside, and the nitrogen bases pair in the center, forming the rungs of the double helix.

Answer 2

Let me help you identify the correct structure of DNA.

The correct answer is: A sugar-phosphate backbone with nitrogen bases in the middle forming a double helix.

Here's why:
- DNA has a sugar-phosphate backbone on the outside of the structure
- The nitrogen bases (A, T, G, C) are located in the middle/interior of the structure
- These bases pair up (A with T, G with C) to form the "rungs" of the ladder-like structure
- The whole molecule forms a double helix shape

The other options are incorrect because:
- The sugar-nitrogen base backbone with phosphates in the middle is incorrect - phosphates are part of the outer backbone
- Nitrogen bases on the outside is incorrect - they are in the middle
- Single helix is incorrect - DNA is always a double helix
- Sugar-nitrogen base backbone is incorrect - it's a sugar-phosphate backbone