Dna Structure

Question 1

DNA molecule components

Answer 1

5-carbon sugar, phosphate, bases (a,t,c,g)

Question 2

Chargaff’S rule

Answer 2

A=t, g= C, composition varies between species

Question 3

DNA structure

Answer 3

Double stranded anti-parallel helical structure with bases perpendicular to the length of the DNA molecule •stabilized by h-bonds

Question 4

Pyrimidines

Answer 4

One ring- cytosine and thymine

Question 5

Purines

Answer 5

2 rings- guanine and adenine

Question 6

How do polynucleotides form?

Answer 6

0H group on 3rd carbon of one nucleotide reacts with phosphate group on 5’ on another nucleotide (free nucleotides have 3 phosphate groups, but bond between 1 and 2 is broken, releasing energy to allow reaction) to make a phosphodiester bond groups are built 5’ to 3’