Which of the following statements about DNA and RNA is correct?

• A. Both DNA and RNA are types of nucleic acid molecules.
• B. DNA is a protein, while RNA is a carbohydrate.
• C. Neither DNA nor RNA are molecules.
• D. Only DNA is considered a biomolecule; RNA is not.

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by understanding the basic definitions of DNA and RNA. DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid) are both types of nucleic acids, which are biomolecules essential for storing and transmitting genetic information.
2. Step 2: Recall the molecular composition of DNA and RNA. DNA is composed of a sugar-phosphate backbone with deoxyribose sugar, while RNA has a similar backbone but contains ribose sugar. Both molecules are made up of nucleotide subunits.
3. Step 3: Evaluate the statement 'DNA is a protein, while RNA is a carbohydrate.' This is incorrect because DNA and RNA are nucleic acids, not proteins or carbohydrates.
4. Step 4: Analyze the statement 'Neither DNA nor RNA are molecules.' This is incorrect because both DNA and RNA are indeed molecules, specifically macromolecules.
5. Step 5: Consider the statement 'Only DNA is considered a biomolecule; RNA is not.' This is incorrect because both DNA and RNA are biomolecules, as they play critical roles in biological processes.