Final answer:
The 5' mRNA cap protects mRNA from degradation and aids in ribosome binding for translation.
Step-by-step explanation:
The 5' mRNA cap plays a crucial role in mRNA stability and translation. It acts as a protective structure that prevents degradation of the mRNA molecule.
Additionally, the cap helps in the attachment of the mRNA with ribosomes in the cytoplasm, facilitating the initiation of protein translation.