Question

gene expression involves two major processes: transcription and translation. which of the following best explains how these processes work together to produce a functional protein from a gene?

• transcription creates amino acids from dna, and translation links them together without using rna.
• transcription converts rna into dna, and translation uses dna to build proteins directly
• transcription and translation both occur in the nucleus, where ribosomes read dna and produce proteins.
• transcription copies dna into rna, and translation uses rna to assemble amino acids into a protein based on the genetic code.

Explanation:

• Analyze the first option: Transcription does not create amino acids from DNA (it produces RNA), and translation requires RNA (mRNA) and uses ribosomes and tRNA, so this is incorrect.
• Analyze the second option: Transcription is the process of copying DNA to RNA, not converting RNA to DNA. Also, translation does not use DNA directly to build proteins; it uses RNA, so this is incorrect.
• Analyze the third option: Transcription occurs in the nucleus, but translation occurs in the cytoplasm (at ribosomes), and ribosomes do not read DNA directly (they read mRNA), so this is incorrect.
• Analyze the fourth option: Transcription is the synthesis of RNA from a DNA template, and translation uses the mRNA (from transcription) to assemble amino acids into a protein according to the genetic code (with tRNA and ribosomes), which matches the correct understanding of gene expression.

Answer:

D. Transcription copies DNA into RNA, and translation uses RNA to assemble amino acids into a protein based on the genetic code. (Note: Assuming the last option is D; if the options were labeled differently, adjust the label accordingly, but the text of the option is as above.)