Step 1: Understanding the Process of Protein Synthesis.
The process of protein synthesis involves two key stages: transcription and translation. Transcription is the process where mRNA is synthesized from DNA, while translation is the process where the mRNA is used to synthesize proteins.
Step 2: Analysis of options.
- (A) Translation: Translation is the process by which proteins are synthesized with the help of m-RNA. This is the correct process.
- (B) Transcription: Transcription is the process of creating m-RNA from a DNA template, not protein synthesis.
- (C) Reverse transcription: This refers to the process where RNA is reverse-transcribed into DNA, which occurs in some viruses, not in regular protein synthesis.
- (D) Replication: Replication is the process of copying DNA, not related to protein synthesis.
Step 3: Conclusion.
The process of protein synthesis with the help of m-RNA is called Translation, making option (A) the correct answer.
Student to attempt either option-(A) or (B):
(A) Write the features a molecule should have to act as a genetic material. In the light of the above features, evaluate and justify the suitability of the molecule that is preferred as an ideal genetic material.
OR
(B) Differentiate between the following:
Study the given molecular structure of double-stranded polynucleotide chain of DNA and answer the questions that follow. 
(a) How many phosphodiester bonds are present in the given double-stranded polynucleotide chain?
(b) How many base pairs are there in each helical turn of double helix structure of DNA? Also write the distance between a base pair in a helix.
(c) In addition to H-bonds, what confers additional stability to the helical structure of DNA?
Study the given below single strand of deoxyribonucleic acid depicted in the form of a “stick” diagram with 5′ – 3′ end directionality, sugars as vertical lines and bases as single letter abbreviations and answer the questions that follow.
Name the covalent bonds depicted as (a) and (b) in the form of slanting lines in the diagram.
How many purines are present in the given “stick” diagram?
Draw the chemical structure of the given polynucleotide chain of DNA.
Use the given information to select the amino acid attached to the 3′ end of tRNA during the process of translation, if the coding strand of the structural gene being transcribed has the nucleotide sequence TAC.
