Question

7. List at least 3-4 differences between DNA and RNA and list all 5 types of RNA and write what they stand for in one sentence? 7 pts

Answer 1

DNA stands for deoxyribonucleic acid and RNA stands for RIbonucleic acid.

DNA	RNA
Pentose sugar is deoxyribose.	Pentose sugar is ribose.
Nitogenous bases are adenine,guanine,cytosine,thymine.	Nitrogenous bases are adenine,guanine,cytosine,uracil.
It is responsible for carrying genetic information except in viruses where RNA is responsible.	It helps in protein synthesis.
It is a double helical structure.	It is single strand but it may coil and form a double helical (hair pin like)structure if there is close proximity of complementary base pairs on the strand.

Five types of RNA:

The three main types of RNA are m-RNA, t-RNA, r-RNA

1. Transfer RNA (t-RNA): It is the smallert RNA and it helps in translation in protein synthesis.

2. Messenger RNA (m-RNA): It is the least abundant. It is a product of transcription of DNA.

3. Ribosomal RNA(r-RNA): It is the most abundant and its role is catalytic as well as structural in synthesis of proteins.

4. Micro RNA(mi-RNA): It plays an important role in gene expression.

5. Small nuclear RNA(sn-RNA): They are transcribes by either RNa polymerase II or RNA polymerase III.