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Which statement about the 5' cap is true?
a) Protects the tRNA from degradation.
b) Protects the rRNA from degradation.
c) It is attached via a 5', 3' - triphosphate linkage.
d) Participates in binding of the mRNA to the ribosome to initiate translation.
e) It is composed of 4 - methylguanosine.