Which of the following is a function of the 5′-methylguanosine cap?

Which of the following is a function of the 5′-methylguanosine cap?

1) It prevents the 5′ end of the mRNA from being digested by exonucleases.

2) It aids in transport of the mRNA out of the nucleus

3) It plays an important role in the initiation of mRNA translation.

4) It prevents the 5′ end of the mRNA from being digested by endonucleases.

A) 1 B) 2 C) 3 D) 4 E) 1, 2 and 3

. During RNA synthesis, about how many RNA nucleotides stay attached to DNA forming a DNA-RNA hybrid just behind the site where the polymerase is operating?

A) about 45

B) about 2

C) about 9

D) about 150

E) about 73

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