BIOLOGICAL MOLECULES (Nucleic Acid)
Nucleic Acid(Classes, Physical and Chemical Properties, grouping)
The DNA vs RNA
Fact!
(a) Structure
(b) Diffrence
|
RNA |
DNA |
|
Formed by only one polynucleotide strand |
Formed by two polynucleotide strands |
|
Not a double helix but a straight chain |
Double helix |
|
Its pentose sugar unit is ribose |
Its pentose sugar unit is deoxyribose |
|
Its bases are adenine, cytosine,guanine and uracil |
Its bases are adenine, cytosine,guanine and thymine |
|
A short molecule |
A long molecule |
|
There are three different types -mRNA, tRNA and rRNA |
There is only one type |
|
No complementary bases pairings by hydrogen bonds except in tRNA |
Complementary bases pairing by hydrogen bonds between the two strands of DNA molecules |
|
Ratio of A+G to C+U varies |
Ratio of A+G C+T |
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