Table of contents

1. Overview of Cell Biology2h 49m
2. Chemical Components of Cells1h 14m
3. Energy1h 33m
4. DNA, Chromosomes, and Genomes2h 31m
5. DNA to RNA to Protein2h 31m
6. Proteins1h 36m
7. Gene Expression1h 42m
8. Membrane Structure1h 4m
- The Lipid Bilayer
  38m
- Membrane Proteins
  25m
9. Transport Across Membranes1h 52m
10. Anerobic Respiration1h 5m
11. Aerobic Respiration1h 11m
12. Photosynthesis52m
13. Intracellular Protein Transport2h 18m
14. Cell Signaling1h 28m
15. Cytoskeleton and Cell Movement1h 39m
16. Cell Division3h 5m
17. Meiosis and Sexual Reproduction50m
18. Cell Junctions and Tissues48m
19. Stem Cells13m
- Stem Cells
  13m
20. Cancer44m
21. The Immune System1h 6m
22. Techniques in Cell Biology1h 41m

5. DNA to RNA to Protein

mRNA Processing

Cell Biology

5. DNA to RNA to Protein

mRNA Processing

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Multiple Choice

Which of the following is NOT a processing event pre-mRNA undergoes to become mRNA?

The addition of an extended sequence of repeating A nucleotides at the 3' end of the transcript

The addition of a methylated guanine at the 5' end of the transcript

Splicing out exons to connect the introns

Removal of 1+ nucleotides in the pre-mRNA transcript

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Verified step by step guidance

Understand that pre-mRNA processing involves several key modifications before it becomes mature mRNA.

Recognize that one of the main processing events is the addition of a poly-A tail, which involves adding a sequence of adenine nucleotides at the 3' end of the transcript.

Identify that another processing event is the addition of a 5' cap, which is a methylated guanine nucleotide added to the 5' end of the transcript.

Recall that splicing is a crucial step where introns (non-coding regions) are removed and exons (coding regions) are joined together. Exons are not spliced out; rather, they are retained in the mature mRNA.

Note that the removal of nucleotides can occur during RNA processing, but it typically involves introns, not exons. Therefore, splicing out exons to connect introns is not a correct processing event.