Which of the following (s) to stabilize mrna by inhibiting its degradation? a. introns b. spliceosomes c. rna polymerase d. tata box e. 5' cap and poly (a) tail.

E. 5' cap and poly (A) taiil.

Explanation: After transcription, the mRNA must be stabilize by inhibiting its degradation to go out the nucleus to the cytoplasm, to be translated by ribosomes. To do that, mRNA is modified in both ends: a methyl-guanosine cap at 5' end and a poly adenine tail (poly A) at 3' end. These modifications prevent its degradation by RNases because they can't recognize the modified RNA.

1. amino acid refers to the fundamental building block of proteins, comprising of an amino group and a carboxyl group.

2. catalyst refers to any substance, which increases the rate of chemical reaction without being used up in the reaction.

3. a complex molecule containing he genetic code is dna or deoxyribonucleic acid.

4. an enzyme refers to a molecule of protein, which is unique in accelerating up a particular chemical reaction in the biological systems.

5. nucleic acid refers to an sequence of sugars, phosphates, and nitrogenous bases, for example, dna and rna.

6. a protein refers to a large, composite organic molecule comprising of a huge number of amino acids associated together with the of peptide bonds.

7. rna refers to a nucleic acid that takes part in the production of proteins.

8. substrate refers to a compound, which takes part in a chemical reaction, and is chemically modified by the reaction.