Question

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.

Explanation:

• Option 1: RNA (specifically mRNA) copies DNA (through transcription) and transports the genetic information to ribosomes for protein synthesis (translation). This is correct as per the central dogma of molecular biology.
• Option 2: RNA does not change the DNA sequence to create new proteins. Mutations can change DNA sequences, but that is not the normal role of RNA in protein synthesis.
• Option 3: RNA does not break down DNA for protein formation. Enzymes like nucleases can break down DNA, but that is not related to protein synthesis.
• Option 4: RNA is not involved in DNA replication for protein synthesis. DNA replication occurs for cell division, and RNA's role in protein synthesis is separate (transcription and translation).

Answer:

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