783345
Description
Mind Map by gordonbrad, updated more than 1 year ago
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Created by gordonbrad
over 10 years ago
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Nucleic Acids
- DNA
- DNA's uses
- DNA is used to store genetic
information, which is all the
instructions needed to grow
and develop from an egg to a
fully grown adult.
- DNA is stored in the
nucleus of a cell because it
is coiled so very tightly.
- They are able to self-replicate because of their
paired structure so the genetic information can be
passed from generation to generation.
- Genes are sections of DNA that code for
a specific sequence of amino acids that
forms a particular protein.
- DNA is very long so it can hold
a lot of information in a small
amount of space.
- DNA is used to store genetic
information, which is all the
instructions needed to grow
and develop from an egg to a
fully grown adult.
- What makes DNA?
- DNA is a polynucleotide - it's made up of
lots of nucleotides joined together.
- A nucleotide consists of a deoxyribose
sugar, a phosphate group and a
nitrogen-containing base.
- The base on each nucleotide can vary.
- There are 4 possible bases;
adenine (A), thymine (T),
cytosine (C) and guanine (G)
- A and G are a type of
base called a purine.
- C and T are a type of
base called pyramidines
- A and G are a type of
base called a purine.
- There are 4 possible bases;
adenine (A), thymine (T),
cytosine (C) and guanine (G)
- The base on each nucleotide can vary.
- Nucleotides join together to form
polynucleotide strands. Two polynucleotide
strands join together and form an
antiparallel double helix.
- They join up between the phosphate
group of one nucleotide and the sugar of
another (sugar phosphate backbone).
- Two polynucleotide strands join together by hydrogen
bonding between the bases. Each base can only pair
with one particular partner - complementary base
pairing. T-A C-G
- Two hydrogen bonds form between A
and T, and three between C and G
- Two hydrogen bonds form between A
and T, and three between C and G
- They join up between the phosphate
group of one nucleotide and the sugar of
another (sugar phosphate backbone).
- DNA is a polynucleotide - it's made up of
lots of nucleotides joined together.
- DNA's uses
- DNA Replication
- 1. The hydrogen bonds
between the polynucleotide
DNA strands break and the
helix unzips.
- 2. Each original single strand
acts as a template for a new
strand. Free floating
nucleotides join to the
exposed bases on the
original template strand by
complementary base pairing.
- 3. The nucleotides on the new strand
are joined together by the enzyme
DNA polymerase. New hydrogen
bonds are formed.
- 4. Each new DNA molecule
contains one strand from the
old DNA molecule.
- 1. The hydrogen bonds
between the polynucleotide
DNA strands break and the
helix unzips.
- Protein Synthesis
- Different proteins have a different number and order of
amino acids. It's the order of nucleotide bases in genes that
determine the order of amino acids in a particular protein.
- Each amino acid is coded for by a sequence
of 3 bases in a gene. Different sequences of
bases code for different amino acids.
- Ribosomes are found in the cytoplasm and
are responsible for protein synthesis. The
DNA molecules are too large to get out of the
nucleus so instead, the RNA leaves the
nucleus and joins with a ribosome in the
cytoplasm where it can be used to synthesise
a protein/
- DNA is copied into RNA for protein synthesis.
- Different proteins have a different number and order of
amino acids. It's the order of nucleotide bases in genes that
determine the order of amino acids in a particular protein.
- RNA
- RNA is very similar to DNA in
that they are both made from
nucleotides containing sugar,
nitrogen-containing bases and
phosphate.
- The structure of
RNA only differs in 3
ways.
- The sugar in RNA nucleotides is
a ribose sugar, not deoxyribose.
- The nucleotides form a
single polynucleotide
strand, not a double one.
- Uracil, a pyramidine, replaces
thymine as a base and always
pairs with adenine in RNA.
- The sugar in RNA nucleotides is
a ribose sugar, not deoxyribose.
- RNA is very similar to DNA in
that they are both made from
nucleotides containing sugar,
nitrogen-containing bases and
phosphate.
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