RNA PROCESSING

Which enzyme is responsible for adding the poly(A) tail during RNA processing?

• RNA polymerase II
  

• Poly(A) polymerase

• Ribonuclease H

• Spliceosome

What is the role of the 5' cap in mRNA?

• Protects the mRNA from degradation
  

• Facilitates transport of mRNA out of the nucleus

• Helps ribosomes recognize the mRNA for translation
  

• All of the above

What are spliceosomes composed of?

• RNA polymerases
  

• Small nuclear RNAs (snRNAs) and proteins

• Ribosomal RNAs and transfer RNAs

• Only snRNAs

Which sequence is commonly found at the 3' end of introns and recognized during splicing?

• TATA box
  

• Polyadenylation signal (AAUAAA)

• GU-AG rule

• Branch point sequence

What is the significance of the poly(A) tail in mRNA?

• Promotes mRNA degradation

• Enhances mRNA stability and translation efficiency

• Initiates DNA replication