JAMB 2024 Biology · Question 11
DNA carries the genetic information and are generally found in the
Options
- A.ribosomes
- B.chromosomes
- C.blood
- D.enzymes
Answer: B. chromosomes
Explanation written with AI and checked against the answer key
1. Analyze the question The question asks where DNA (deoxyribonucleic acid), which carries genetic information, is generally found in a cell.
2. Explain the concept DNA is a long molecule that stores hereditary information. In a cell, it is tightly coiled and wrapped around proteins called histones to form structures called chromosomes. In eukaryotic cells (plants, animals), chromosomes are located in the nucleus. Genes, the units of heredity, are specific segments of DNA along the chromosomes.
3. Solution: check each option
- A. Ribosomes: These are sites of protein synthesis. They are made of rRNA and proteins, not primarily DNA. ❌
- B. Chromosomes: These are thread-like structures in the nucleus made of DNA and protein. They carry the genes. ✅
- C. Blood: This is a tissue, not the structure that carries DNA. DNA is in the nuclei of white blood cells, but "blood" is not the general location. ❌
- D. Enzymes: These are protein catalysts, and they do not contain DNA. ❌
4. Answer The correct option is B. chromosomes.
5. Exam tip Remember the hierarchy: Nucleus → Chromosomes → DNA → Genes. Also remember that DNA is in the chromosomes, while RNA is involved at the ribosomes (protein synthesis). If a JAMB question asks where genetic information is found, think "chromosomes" first.
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