- A They encode the start and stop codons recognized during translation
- B They protect mRNA from degradation and aid ribosome binding
- C They are excised together with introns during the spliceosome reaction
- D They serve solely as the signal required for nuclear pore export
Correct answer: B. They protect mRNA from degradation and aid ribosome binding
Explanation: The 5' 7-methylguanosine cap protects mRNA from nuclease degradation and helps ribosome binding. The 3' poly-A tail also protects mRNA and aids in nuclear export and translation.
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.