Question

which of the following is a correct statement about mrna?

○ mrna moves from the nucleus to the cytoplasm following rna processing.

○ segments of mrna that code for protein are removed before translation.

○ mrna includes a cap that consists of extra adenine nucleotides.

○ mrna binds directly to amino acids during translation.

○ mrna is transcribed from dna in the cytoplasm.

Explanation:

• Analyze each option:
• Option 1: After RNA processing (including capping, poly - adenylation, and splicing in eukaryotes), mRNA is transported from the nucleus (where transcription occurs) to the cytoplasm for translation. This is a correct process.
• Option 2: In RNA processing, introns (non - coding segments) are removed, and exons (coding for protein) are spliced together. So the statement that segments of mRNA that code for protein are removed is wrong.
• Option 3: The 5' cap of mRNA consists of a modified guanine nucleotide, not adenine nucleotides.
• Option 4: tRNA (transfer RNA) binds directly to amino acids and brings them to the ribosome during translation, while mRNA provides the code. So mRNA does not bind directly to amino acids.
• Option 5: Transcription of mRNA from DNA occurs in the nucleus (in eukaryotes), not in the cytoplasm.

Answer:

A. mRNA moves from the nucleus to the cytoplasm following RNA processing.