Nucleotides/nucleic acids occur in
(a) Ribosomes
(b) Mitochondria
(c) DNA, RNA, chloroplasts and nucleus
(d) All the above

Options

A. Ribosomes
B. Mitochondria
C. DNA,RNA, chloroplasts and nucleus
D. All the above.

Answer

To determine where nucleotides or nucleic acids occur, we can analyze each option provided in the question:

1. **Understanding Nucleotides and Nucleic Acids**:
- Nucleotides are the building blocks of nucleic acids, which include DNA (deoxyribonucleic acid) and RNA (ribonucleic acid).

2. **Analyzing Option (a) Ribosomes**:
- Ribosomes are the sites of protein synthesis and contain ribosomal RNA (rRNA), which is a type of nucleic acid. Therefore, nucleotides are present in ribosomes.

3. **Analyzing Option (b) Mitochondria**:
- Mitochondria contain their own DNA, which is circular and double-stranded. This DNA is also made up of nucleotides. Hence, nucleotides are present in mitochondria.

4. **Analyzing Option (c) DNA, RNA, Chloroplasts, and Nucleus**:
- DNA and RNA are both nucleic acids composed of nucleotides. Chloroplasts also contain their own DNA, which is similar to mitochondrial DNA. The nucleus houses the cell's DNA. Therefore, nucleotides and nucleic acids are indeed found in all these structures.

5. **Analyzing Option (d) All the above**:
- Since we have established that nucleotides and nucleic acids are present in ribosomes, mitochondria, DNA, RNA, chloroplasts, and the nucleus, this option encompasses all the previous options.

**Conclusion**: The correct answer is (d) All the above, as nucleotides and nucleic acids are found in all the mentioned cellular components.