Question

dna and rna structure
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proteins are made in ribosomes, but dna is stored in the nucleus. how does rna help in this process?
rna copies dna and transports it to ribosomes for protein synthesis.
rna changes the dna sequence to create new proteins.
rna breaks down dna so that proteins can be formed.
rna helps in the replication of dna before protein synthesis.
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Explanation:

• DNA is in the nucleus. Ribosomes (where proteins are made) are in the cytoplasm.
• RNA (specifically mRNA - messenger RNA) is synthesized from DNA (through transcription).
• mRNA then moves from the nucleus to the ribosomes (in the cytoplasm) and provides the code for protein synthesis (translation).
• Let's check each option:
• Option 1: RNA (mRNA) copies DNA (during transcription) and transports it (the genetic code) to ribosomes for protein synthesis. This is correct.
• Option 2: RNA does not change the DNA sequence. DNA sequence is the template for RNA synthesis.
• Option 3: RNA does not break - down DNA.
• Option 4: RNA is not involved in DNA replication before protein synthesis. DNA replication occurs for cell - division (not directly for protein synthesis in the way described in the question).

Answer:

RNA copies DNA and transports it to ribosomes for protein synthesis.