Unit Three- DNA Structure Flashcards
How many Rings do pyrimidines have
1, 6 member ring
what are the pyrimidines in DNA
thymine and cytosine
what are the purines
1, 6 member ring fused to a 5 member ring
what are the purines
adenine and guanine
What is a nucleotide made of
-pentose sugar
-phosphate
-1 base
where does the nitrogenous base connect to the sugar
carbon 1
where does the phosphate group bind to the bind to the sugar
carbon 5
what does a nucleoside consist of
-a sugar
-a base
*no phosphate
how are nucleotides linked together
phosphodiester linkages
where do nucleotides link together
C3 of the sugar and the phosphate of the next nucleotide
what direction do nucleotides connect in
5’ to 3’
how are nucleotides joined together in a double helix
hydrogen bonding
what does hydrogen bonding occur between
one pyrimidine and one purine
how often does the double helix turn
10.5 nucleotides
what is the backbone of the DNA made of
alternating sugar and phosphate
