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8509519
the functions of nucleic acids
Descripción
A level Biology Mapa Mental sobre the functions of nucleic acids, creado por freya hinks el 11/04/2017.
Sin etiquetas
nucleic acids
dna
rna
biology
a level
as level
aqa
biology
a level
Mapa Mental por
freya hinks
, actualizado hace más de 1 año
Más
Menos
Creado por
freya hinks
hace más de 7 años
11
0
0
Resumen del Recurso
the functions of nucleic acids
storage
double helix
prokaryotes
liner DNA that exists as chromosomes
long DNA
wrapped around histones
triplets / codons
eukaryotes
circular chromosome
short DNA
supercoiled to fit in cell
ribonucleic acid
protein synthesis
1st stage, transcription
mRNA
a complementary copy of DNA strand
carries the genetic code from DNA to the ribosomes to make a protein
made during transcription by RNA polymerase
eukaryotes copy introns and exons / pre mRNA
splicing then occurs in the nucleus producing mRNA
prokaryotes copy all DNA
2nd stage, translation
tRNA
has an amino acid binding site on it
has an anticodon thats complementary to the first codon
it carries the amino acids used to produce the protein
in a clover shape
single stranded
phosphate group, pentose sugar and 4 base pairs
adenine (A), uracil (U), cytosine (C), guanine (G)
adenine (A), thymine (T), cytosine (C), guanine (G)
complementary base pairing, A and T, C and G
deoxyribonucleic acid
double stranded
amino acids
universal
the same triplets code for the same amino acids in all living organisms
degenerate
some amino acids are coded for by more than one base triplet
non overlapping
one triplet produces one amino acid
read in sequence
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