MCAT Biochemistry Question 103: Answer and Explanation
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Question: 103
13. A eukaryotic cell has been found to exhibit a truncation mutation that creates an inactive RNA polymerase I enzyme. Which type of RNA will be affected by this inactivation?
- A. rRNA
- B. tRNA
- C. snRNA
- D. hnRNA
Correct Answer: A
Explanation:
RNA polymerase I in eukaryotes is found in the nucleolus and is in charge of transcribing most of the rRNA for use during ribosomal creation. RNA polymerase II is responsible for hnRNA and snRNA. RNA polymerase III is responsible for tRNA and the 5S rRNA.