Biology A Semester Online Practice

Question

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Question
There are several key differences between DNA and RNA, the two main types of nucleic acid. Identify the statement below that correctly describes a difference between RNA and DNA.(1 point)
Responses

Adenine binds with the nitrogen base thymine in DNA while it binds with uracil in RNA.
Adenine binds with the nitrogen base thymine in DNA while it binds with uracil in RNA.

DNA is a single-stranded molecule whereas RNA is a double-stranded molecule in cells.
DNA is a single-stranded molecule whereas RNA is a double-stranded molecule in cells.

DNA uses ribose while RNA uses deoxyribose as the sugar in the molecule’s backbone.
DNA uses ribose while RNA uses deoxyribose as the sugar in the molecule’s backbone.

DNA uses phosphate groups to link nucleotides together whereas RNA uses ketone groups.
DNA uses phosphate groups to link nucleotides together whereas RNA uses ketone groups.
Remaining Attempts : 3
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Answer 1

The correct statement that describes a difference between RNA and DNA is:

Adenine binds with the nitrogen base thymine in DNA while it binds with uracil in RNA.

Here’s a brief explanation of why the other options are incorrect:

• DNA is a single-stranded molecule whereas RNA is a double-stranded molecule in cells. (This is incorrect; DNA is typically double-stranded, while RNA is usually single-stranded.)

• DNA uses ribose while RNA uses deoxyribose as the sugar in the molecule’s backbone. (This is incorrect; DNA uses deoxyribose, while RNA uses ribose.)

• DNA uses phosphate groups to link nucleotides together whereas RNA uses ketone groups. (This is incorrect; both DNA and RNA use phosphate groups to link nucleotides together.)

So, the first response is the accurate difference between RNA and DNA.