DNA structure

Question 1

what is DNA?

Answer 1

a polymer, made up of many nucleotides bonded together in a long chain

Question 2

what are DNA molecules made up of?

Answer 2

two polynucleotide strands lying parallel to one another twisted in a double helix

Question 3

why is DNA said to be antiparallel?

Answer 3

because the two strands run in opposite directions to one another

Question 4

what bonds join the alternating deoxyribose sugars and phosphate groups together?

Answer 4

covalent bonds

Question 5

what direction do the strands run?

Answer 5

5’ to 3’ or 3’ to 5’

Question 6

where are the hydrogen bonds in a DNA molecule?

Answer 6

holding together the two polynucleotide strands in which are present between the nitrogenous bases

Question 7

how many hydrogen bonds are present between A and T?

Answer 7

two

Question 8

how many hydrogen bonds are present between C and G?

Answer 8

three

Question 9

what is complementary base pairing?

Answer 9

when Adenine and Thymine join together by 2 hydrogen bonds and Cytosine and Guanine join together by 3 hydrogen bonds