DNA structure Flashcards
what is DNA?
a polymer, made up of many nucleotides bonded together in a long chain
what are DNA molecules made up of?
two polynucleotide strands lying parallel to one another twisted in a double helix
why is DNA said to be antiparallel?
because the two strands run in opposite directions to one another
what bonds join the alternating deoxyribose sugars and phosphate groups together?
covalent bonds
what direction do the strands run?
5’ to 3’ or 3’ to 5’
where are the hydrogen bonds in a DNA molecule?
holding together the two polynucleotide strands in which are present between the nitrogenous bases
how many hydrogen bonds are present between A and T?
two
how many hydrogen bonds are present between C and G?
three
what is complementary base pairing?
when Adenine and Thymine join together by 2 hydrogen bonds and Cytosine and Guanine join together by 3 hydrogen bonds
