A nucleic acid is made up of which kind of monomers ?

Options

A. Amino acids
B. Nucleotides
C. Alternating sugar and phosphate groups
D. Monosaccharides

Explanation

To answer the question, "A nucleic acid is made up of which kind of monomers?" we need to identify the correct type of monomer that constitutes nucleic acids.

### Step-by-Step Solution:

1. **Understanding Nucleic Acids**: Nucleic acids are large biomolecules essential for all known forms of life. The two main types of nucleic acids are DNA (Deoxyribonucleic Acid) and RNA (Ribonucleic Acid).

2. **Identifying the Monomer**: The monomers that make up nucleic acids are called nucleotides. Each nucleotide consists of three components:
- A sugar molecule (deoxyribose in DNA and ribose in RNA)
- A phosphate group
- A nitrogenous base (adenine, thymine, cytosine, guanine in DNA; adenine, uracil, cytosine, guanine in RNA)

3. **Conclusion**: Therefore, the correct answer to the question is that nucleic acids are made up of nucleotides.

### Final Answer:
A nucleic acid is made up of nucleotides.

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