RNA Splicing

Eukaryotic mRNA molecules often contain segments called introns that do not code for amino acids and must be removed by a process known as splicing. The sections of the RNA called exons are the portions necessary for protein synthesis. In splicing, the introns are looped out and removed by enzymes called nucleases that cleave, or cut, the noncoding sequences away from the rest of the molecule. In addition, the exons are ligated, or sealed together, generating a mature messenger RNA that can be translated into a functional protein.

Question 1: During RNA splicing, which molecules that do not code for amino acids are removed?
  1. RNA splices
  2. Splicosomes
  3. Exons
  4. Introns


Answer 1 Answer – (d) Introns.

Question 2: Which enzymes are responsible for cutting or cleaving introns?
  1. Nucleases.
  2. Transferases.
  3. Polymerases.
  4. Oxidoreductases.


Answer 2 Answer – (a) Nucleases.

Question 3: In some cases, in order for a mature messenger RNA molecule to be able to be converted into a functional protein, _____________ must be cleaved out and _______________ must be sealed together.
  1. exons, introns
  2. introns, exons
  3. polymerases, nucleotides
  4. DNA, tRNA


Answer 3 Answer - (b) introns, exons