What is DNA? What is an easy way to remember what the four nucleotides are in...

What is DNA?

What is an easy way to remember what the four nucleotides are in DNA, which are purines and which are pyrimidines, what nucleotides are single versus double ringed structures, and why certain nucleotides complement one another?

If an organism developed a mutation in the gene that codes for helicase, how would it affect cell division?

Why did DNA evolve for genetic storage if RNA preceded it?

Expert Solution

DNA is the genetic material in eukaryotic organism and some of the prokaryotic organism.

The 4 nucleotide of DNA is - A,G,T,C.

A & G is purine & they are double ring structured.

T & C is pyrimidine & they are single ring structured.

[ A= adenine, T= thymine,G= guanine, C= cytosine].

A purine is complemented by a pyrimidine and vice versa because to maintain a constant diameter of DNA.

Helicase separate the two strand of DNA during DNA replication and create replication fork and DNA polymerase can act on single strand. So if helicase mutation occur, DNA replication will not occur.

Single-stranded RNA is unstable and is easily damaged by enzymes. By doubling the existing RNA molecule, and using deoxyribose sugar instead of ribose sugar, DNA evolved as a much more stable form to pass genetic information with accuracy.

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gladiator answered 2 years ago

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