Which of the following correctly labels the enzyme responsible for synthesizing RNA during transcription in a eukaryotic cell?

• A. Helicase
• B. DNA ligase
• C. RNA polymerase II
• D. Ribosome

Answer: (C)

Verified step by step guidance

1. Understand the process of transcription: Transcription is the synthesis of RNA from a DNA template. In eukaryotic cells, this process involves specific enzymes that facilitate the creation of RNA molecules.
2. Identify the role of RNA polymerase II: RNA polymerase II is the enzyme responsible for synthesizing messenger RNA (mRNA) during transcription in eukaryotic cells. It binds to the DNA template and catalyzes the addition of ribonucleotides complementary to the DNA sequence.
3. Clarify the roles of other options: Helicase is involved in unwinding the DNA double helix during replication, not transcription. DNA ligase is responsible for joining DNA fragments during replication or repair, and the ribosome is involved in translation, not transcription.
4. Focus on RNA polymerase II: RNA polymerase II specifically synthesizes RNA by reading the DNA template strand and assembling a complementary RNA strand. This enzyme is essential for gene expression in eukaryotic cells.
5. Conclude the correct labeling: Based on the roles of the enzymes provided, RNA polymerase II is the correct answer for the enzyme responsible for synthesizing RNA during transcription in eukaryotic cells.