The following features occur during protein synthesis:
(a) Movement of mRNA from the nucleus into the cytoplasm, where it binds to the ribosomes
(b) Formation of tRNA-amino acid complex
(c) Transcription of specific segments of DNA into mRNA molecules in the nucleus
(d) Binding of N-terminal amino acid, methionine tRNA to the 'P' site of the ribosome. The tRNA anticodon 'pairs with AUG on mRNA'
(e) Formation of peptide bond between first and second amino acids at the A site
(f) Release of the complete polypeptide chain from mRNA and the ribosomes
(g) Migration of dipeptide to form a tripeptide and then a polypeptide
The correct order of events is:

Options

A. c, b, a, e, f and g
B. a, b, c, d, e, f and g
C. c, a, b, e, d, f and g
D. c, a, b, d, e, g and f

Answer

To determine the correct order of events during protein synthesis from the provided features, we can break down the steps as follows:

### Step-by-Step Solution:

1. **Transcription of DNA into mRNA**:
- The first step in protein synthesis is the transcription of specific segments of DNA into mRNA molecules in the nucleus. This corresponds to feature (c).

2. **Movement of mRNA to the Cytoplasm**:
- After mRNA is synthesized, it moves from the nucleus into the cytoplasm, where it binds to ribosomes. This corresponds to feature (a).

3. **Formation of tRNA-amino acid Complex**:
- Next, the tRNA molecules, which carry specific amino acids, form a complex with their respective amino acids. This corresponds to feature (b).

4. **Binding of tRNA to the Ribosome**:
- The N-terminal amino acid, methionine tRNA, binds to the 'P' site of the ribosome. The tRNA anticodon pairs with the start codon AUG on the mRNA. This corresponds to feature (d).

5. **Formation of Peptide Bond**:
- A peptide bond is formed between the first and second amino acids at the A site of the ribosome. This corresponds to feature (e).

6. **Migration of Dipeptide to Form a Tripeptide**:
- The dipeptide then migrates to form a tripeptide and subsequently a polypeptide chain. This corresponds to feature (g).

7. **Release of the Complete Polypeptide Chain**:
- Finally, the complete polypeptide chain is released from the mRNA and the ribosomes. This corresponds to feature (f).

### Correct Order of Events:
The correct order of events during protein synthesis is:
1. (c) Transcription of specific segments of DNA into mRNA molecules in the nucleus.
2. (a) Movement of mRNA from the nucleus into the cytoplasm, where it binds to the ribosomes.
3. (b) Formation of tRNA-amino acid complex.
4. (d) Binding of N-terminal amino acid, methionine tRNA to the 'P' site of the ribosome. The tRNA anticodon pairs with AUG on mRNA.
5. (e) Formation of peptide bond between first and second amino acids at the A site.
6. (g) Migration of dipeptide to form a tripeptide and then a polypeptide.
7. (f) Release of the complete polypeptide chain from mRNA and the ribosomes.