Which of the following correctly describes events that occur during transcription?

• A. DNA ligase joins Okazaki fragments during DNA replication.
• B. Ribosomes assemble amino acids into proteins using mRNA.
• C. DNA helicase unwinds the DNA double helix for replication.
• D. RNA polymerase synthesizes RNA by using a DNA template.

Answer: (D)

Verified step by step guidance

1. Understand the process of transcription: Transcription is the process by which RNA is synthesized from a DNA template. This occurs in the nucleus of eukaryotic cells.
2. Identify the key enzyme involved: RNA polymerase is the enzyme responsible for reading the DNA template and synthesizing a complementary RNA strand.
3. Differentiate transcription from other processes: DNA replication involves enzymes like DNA ligase and DNA helicase, which are not directly involved in transcription.
4. Recognize the role of ribosomes: Ribosomes are involved in translation, not transcription. They use mRNA to assemble amino acids into proteins.
5. Conclude with the correct description: During transcription, RNA polymerase synthesizes RNA by using a DNA template, which is the correct event described in the problem.