Question

Pre-mRNAs are rapidly bound by SnRNPs which carry out dual steps of RNA splicing, that removes the intron and
joins the upstream and downstream exons. The following statements describe some facts related to this event:
P. Almost all introns begin with GU and end with AG sequences and hence all the GU or AG sequences are spliced
out of RNA.
Q. U2 RNA recognizes important sequences at the 3' acceptor end of the intron.
R. The spliceosome uses ATP to carry out accurate removal of intron.
S. An unusual linkage with 2 OH group of guanosine within the intron form a 'lariat' structure.
Which of the following combinations is correct?
a. P and Q.
b. Q and R
C. R and S
d. S and P

Answer 1

Answer:

pq tsruhftuikj@dtyuiu