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Nucleic Acids
a) State that deoxyribose nucleic acid (DNA) is a polynucleotide, usually
double stranded, containing the nucleotide bases, adenine, thymine,
cytosine and guanine

A nucleotide is composed of:
- phosphate group
- Deoxyribose sugar (pentose sugar)
- Nitrogenous Base
4 different bases:
- Adenine
- Thymine
- Cytosine
-…

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C) Describe how hydrogen bonding between complementary base pairs (A-T
and C-G) on two antiparallel DNA polynucleotides leads to the formation of a
DNA molecule and how the twisting of DNA forms a double helix shape


Adenine ­ thymine (2 hydrogen
bonds)
Guanine ­ Cytosine (3 hydrogen
bonds)
RNA =…

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phosphate groups of nucleotides to join

E) State that a gene is a sequence of DNA nucleotides that codes for a
polypeptide



Gene ­ a length of DNA that codes
for one or more polypeptides
The sequence of bases on DNA are
code instructions for proteins, they
code for the…

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ribosome moves along the mRNA (codon)
tRNA bring amino acids (anti-codon) which then complementary bind 3 at a time via rRNA ­
this is translation
second rRNA bonds via 3 exposed bases
the amino acids form peptide bonds, catalysed by peptidyl transferase
process repeats until polypeptide is formed

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