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Transcript of DNA
DNA is made of two strands of polynucleotides twisted in
THE BIG PICTURE: DNA & RNA
produce 2 identical DNA's
each DNA strand distributed to 2 new cells
2 polynucleotides arranged like a ladder:
sides are S-P (antiparallel)
rungs are bases
A with T
G with C
H bonds connect
These two strands are held together through
These "rungs" of the ladder are the
What is the backbone made up of?
Give me an example of a Base.
A base (A,T,G,C) + one sugar & one Phosphate = a nucleotide
DNA, Genes, Chromosomes
What make up chromosomes?
A chromosome is ONE gigantic
DNA molecule all wrapped around proteins (Histones)
A gene is a segment of DNA that codes for an amino acid used to make a
Replication occurs during
of the cell cycle
Replication: Sequence of events
Hydrogen bonds break down and
exposing the now unpaired bases.
form new hydrogen bonds
bonds to another nucleotied's sugar
The making of
is transcribed from DNA
This takes place in the
of the cell (DNA is too big to leave nucleus)
(RNA is a partial copy of DNA)
mRNA: (messanger): copy of a
mRNA is small enough to leave the
and travel to the
Each triplet of bases in mRNA is called a
cloverleaf-shaped molecule with
attached to one end
different amino acids
There needs to be only
different tRNA anti-codons, but there are nearly
Each type of tRNA has a different anti-codon and carries a different
There is one other type of RNA it is:
This is what builds-into
the simple steps for ribosomes
Each RNA type is used to create proteins, this is called
Protein synthesis consists of
in the nucleus and
in the cytoplasm.
In RNA the nucleotide: Thymine, is replaced with a new nucleotide called Uracil
Differences of DNA From RNA are:
No thymine-it is uricile
Give another word for Transcription & Translation:
A chromosome consists of many many genes