DNA structure
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13 Terms
why does the phosphate in a nucleotide matter?
makes the nucleotide negatively charged
allows nucleotide to bind together to form the sugar-phosphate backbone
what is a nucleoside?
a nucleotide without the phosphate group
which bases are purines?
adenine
guanine
which bases are pyrimidine?
uracil
cytosine
thymine
which sugar type is more stable?
deoxyribose
which sugar type is used for long-term storage
deoxyribose
how are nucleotides linked?
by a phosphodiester bond
how does the phosphodiester bond form?
between the 5’ carbon of one nucleotide and the 3’ carbon of the next nucleotide
a dehydration reaction occurs as a water molecule is lost in the process
which way do we read the nucleotide sequence?
from 5’ to 3’
how are the 2 strands in DNA held together?
hydrogen bonds
why must a purine only pair with a pyrimidine?
makes sure all base pairs are the same width
most stable combination
most energy-efficient combination
how many hydrogen bonds from between A and T?
2
how many hydrogen bonds form between C and G?
3