Question

Assertion :Replication and transcription occur in the nucleus but translation occurs in the cytoplasm. Reason: mRNA is transferred from the nucleus into the cytoplasm where ribosomes and amino acids are available for protein synthesis.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.
• C. Assertion is correct but Reason is incorrect.
• D. Both Assertion and Reason are incorrect.

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

Replication is a synthesis of new DNA strands using parental strand as a template. DNA polymerase enzyme adds deoxyribonucleotides to synthesize DNA using the base sequence of parental DNA strand. The primary transcript is synthesized during transcription using DNA template strand which undergoes processing to produce a functional mRNA. Both replication and transcription occur in the nucleus. The processed mRNA is transported to the cytoplasm where it serves as a template for amino acid sequence of the polypeptide, synthesized during protein synthesis. Protein synthesis is carried out on ribosomes, a cytosol organelle, by using the mRNA sequence as a template for type and sequence of amino acids in growing polypeptide chain. Amino acids are brought to ribosomes by tRNAs which are present in the cytosol. Thus, the correct answer is option A.