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biology
paper two
inheritance, variation and evolution
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Alyssa Smith
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Cards (221)
What does DNA stand for?
Deoxyribonucleic
acid
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What is the role of DNA in a cell?
It contains coded information for
organism
functions
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What determines inherited characteristics in an organism?
What is
in the DNA
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Where is DNA found in cells?
In the
nucleus
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How do chromosomes normally appear?
In
pairs
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What is DNA classified as?
A
polymer
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What is the structure of DNA?
Two strands coiled in a
double helix
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What is a gene?
A small section of
DNA
on a
chromosome
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What does each gene code for?
A particular sequence of
amino acids
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How many amino acids are used to make proteins?
20
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What determines the order of amino acids in a protein?
The order of
bases
in a
gene
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What is the function of DNA in protein production?
It determines what
proteins
the
cell
produces
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What is a genome?
The entire set of
genetic
material in an organism
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Why is understanding the human genome important?
It helps identify
genes
linked to
diseases
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How can scientists trace human migration using genomes?
By
investigating
differences in genomes
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What are nucleotides?
Repeating
units
that make up
DNA
strands
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What three components make up a nucleotide?
Sugar
,
phosphate
, and base
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What forms the backbone of DNA strands?
Sugar
and
phosphate
molecules
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What is complementary base pairing?
A
pairs with
T
,
C
pairs with
G
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How does the order of bases affect proteins?
It decides the order of
amino acids
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How many bases code for each amino acid?
A sequence of
three
bases
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What happens to amino acids after they are coded?
They are joined to make proteins
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What are non-coding parts of DNA responsible for?
Switching
genes
on and off
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Where are proteins made in the cell?
In the
ribosomes
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What do carrier molecules do during protein synthesis?
Bring correct amino acids to
ribosomes
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How does mRNA function in protein synthesis?
It carries the code from
DNA
to
ribosomes
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What happens to a chain of amino acids after assembly?
It folds into a
unique shape
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What is the function of enzymes?
Speed up
chemical reactions
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What is an example of a hormone?
Insulin
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What are structural proteins?
Physically strong proteins like
collagen
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What is a mutation?
A random change in an
organism's
DNA
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How can mutations occur?
Spontaneously or due to
exposure
to substances
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What is a genetic variant?
A
different
form
of a
gene
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How do mutations affect proteins?
They can change the protein's
structure
and function
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What happens if an enzyme's active site shape changes?
The
substrate
may no longer bind
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What can happen to structural proteins like collagen due to mutations?
They could lose
strength
and function
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What are insertions in DNA mutations?
New bases inserted into the
sequence
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How do insertions affect the reading of DNA?
They change how groups of three bases are read
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What are deletions in DNA mutations?
Random bases deleted from the
sequence
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How do deletions affect the reading of DNA?
They change how the
base sequence
is read
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