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F212 - Nucleic Acids
Description
F212 - Nucleic Acids
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f212
nucleic acids
biology
f212
a-level
Mind Map by
katy stopforth
, updated more than 1 year ago
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Created by
katy stopforth
about 9 years ago
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Resource summary
F212 - Nucleic Acids
DNA
double stranded
Nitrogenous Bases
Adenine
Thymine
Cytosine
Guanine
a polynuleotide
Semi-Conservative Replication
1. DNA unwinds
2. DNA helicase unzips the DNA
breaks the hydrogen bonds
forms two separate strands
act as templates
3. Free DNA nucleotides join to the bases
complementary base pairing
purine to pyramidine
4. DNA polymerase joins the new nuelotides by strong covalent bonds
forming sugar-phosphate backbone
5. winding enzyme reforms double helix structure
RNA
Nitrogenous Bases
Adenine
Uracil
Cytosine
Guanine
a polynucleotide
single stranded
Nitrogenous Bases
Pyramidines
Thymine
Cytosine
Uracil
Purines
Adenine
Guanine
Combinations
A,T or A,U
two hydrogen bonds
G,C
three hydrogen bonds
anti-parallel strands
in DNA - the strand twist to from a 'double helix'
Genes
a sequence of DNA nucleotides that codes for a polypeptide
Role of DNA and RNA
1. required gene exposed by splitting hydrogen bonds in that section of the DNA
2. RNA created a complementary strand
mRNA
3. mRNA leaves nucleis through nuclear pore and attaches to ribosome
4. tRNA brings amino acids to the ribosome in the correct order
according to base sequence
5. amino acids joined together by peptide bonds
gives a protein with a specific tertiary structure
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