Which one of the following is incorrectly matched?

Options

A. Ribozyme - 23s rRNA
B. lacA - Permease
C. `EST_(S)` - Satellite DNA
D. Chromosome 1 - 2968 genes

Answer

To determine which of the given pairs is incorrectly matched, we will analyze each option one by one.

### Step 1: Analyze the first pair - Ribozyme and 23S rRNA
- Ribozyme refers to RNA molecules that have catalytic properties, meaning they can catalyze biochemical reactions.
- 23S rRNA is a component of the large subunit of the ribosome and acts as a ribozyme during protein synthesis, specifically in forming peptide bonds between amino acids.
- **Conclusion**: This pair is correctly matched.

### Step 2: Analyze the second pair - lacA and polymerase
- lacA is a gene that encodes a protein involved in the metabolism of lactose in bacteria, specifically in the lac operon.
- Polymerase refers to enzymes that synthesize nucleic acids (like DNA or RNA) from nucleotides.
- The term "lacA" does not refer to polymerase; instead, it is a part of the lac operon, which is related to lactose metabolism.
- **Conclusion**: This pair is incorrectly matched.

### Step 3: Analyze the third pair - ESTS and satellite DNA
- ESTS (Expressed Sequence Tags) are short sub-sequences of cDNA (complementary DNA) used to identify gene transcripts.
- Satellite DNA consists of repetitive non-coding DNA sequences found in the genome, often associated with centromeres.
- ESTS are not classified as satellite DNA.
- **Conclusion**: This pair is incorrectly matched.

### Step 4: Analyze the fourth pair - Chromosome 1 and 2869 genes
- Chromosome 1 is known to contain approximately 2869 genes, which are responsible for various functions in the body.
- This information is accurate and well-documented in genetic studies.
- **Conclusion**: This pair is correctly matched.

### Final Conclusion
Based on the analysis, the incorrectly matched pairs are:
1. lacA and polymerase (incorrect)
2. ESTS and satellite DNA (incorrect)

However, since the question asks for one incorrectly matched pair, the most significant incorrect match is **ESTS and satellite DNA**.

### Answer: ESTS and satellite DNA is incorrectly matched.

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