21. Eukaryotic mRNA but not prokaryotic mRNA contain 5\' untranslated regions. A

ID: 80820 • Letter: 2

Question

21. Eukaryotic mRNA but not prokaryotic mRNA contain 5' untranslated regions.

A. True

B. False

22. What is the main difference between siRNA and miRNA?

A. siRNAs are involved in RNA interference; miRNAs are not.

B. miRNAs are encoded by the genome; siRNAs are not.

C. miRNAs are processed by Dicer; siRNAs are not.

D. siRNAs are double-stranded; miRNAs are not.

23. Which of the following is not a feature of miRNAs?

A. Primary miRNA transcripts have internal complementary sequences capable of forming hairpin structures.

B. Precursor miRNAs have internal complementary sequences capable of forming hairpin structures.

C. miRNAs are exported from the nucleus in their single-stranded form.

D. Precursor miRNAs are approximately 60–70 nucleotides long.

24. The enzyme that catalyzes the initial processing of miRNAs in the nucleus is:

A. Drosha.

B. Dicer.

C. Argonaute.

D. RNase A.

Answer:

21.Option B. False (Because 5' untranslated regions is present in eukaryotes and prokaryotes.)

22. Option D.siRNAs are double-stranded; miRNAs are not.

23.Option B. Precursor miRNAs have internal complementary sequences capable of forming hairpin structures.

24.Option A. Drosha.

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.