MCAT daily quiz (3.5.2011)

What is the relation of AT content in a gene?

Q: What is the relation of AT content in a gene?

A: always the same.

MCAT Quick fact:

the higher the GC content, the higher the melting temperature of the DNA, the tighter the double helix. Because A and T form two hydrogen bonds, G and C form three hydrogen bond.

A adenine (purine)

T thymine (pyrimidine)

G guanine (purine)

C cytosine (pyrimidine)

A T (2 H-bond)

G C (3 H-bond)

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[此贴子已经被作者于2011/3/6 1:50:36编辑过]