Proteins and Enzymes

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Which bonds are amino acids joined by?
Peptide
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What are many joined amino acids called?
Polypeptide
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Definition of a Primary Structure
Sequence of amino acids in polypeptide chain determining the rest of the protein structure
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An example of a quaternary structure
Haemoglobin
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Which bonds are there in a Tertiary structure
Hydrogen, Ionic, Disulphide
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Which bonds are alpha helix and beta pleated sheets held together by?
Hydrogen
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Keratin is in
Hair
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Collagen is found in
Bone
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Myosin is
A muscle protein
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Which is the optimum temperature for enzyme activity?
40 degrees Celsius
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In the lock and key model..
The Active site acts as a lock and the substrate is the key
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The induced fit model diagram states that
the enzyme is flexible and the active site can change shape
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Why is the optimum temperature of enzymes normally about 40 degrees
Because this is the temperature at which hydrogen bonds break
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Is denaturation usually irreversible?
Yes
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Which is the optimum pH for most enzymes?
7-8
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Which extreme enzymes can work at extreme pH?
Protease
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How does an increased enzyme concentration affect the rate of reaction
rate of reaction increases linearly
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When enzyme concentration reaches v max...
the rate of reaction plateaus
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Competitive inhibitors..
compete with the substrate for the active site
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Lactase breaks
Lactose into Glucose and Galactose
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The induced model states that
The active site changes shape to become complementary to a specific type of substrate
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Amino acids are joined when there is a
Condensation reaction
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A condensation reaction forms a covalent bond between the
Amino group and the acid group
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In the Biuret test for proteins. The solution will turn......... if protein is present
purple
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In the Biuret test for proteins, which chemical do you add to the food initially
NaOH
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In the Biuret test for proteins, which is the reagant
CuSO4 and NaOH
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Other cards in this set

Card 2

Front

What are many joined amino acids called?

Back

Polypeptide

Card 3

Front

Definition of a Primary Structure

Back

Preview of the front of card 3

Card 4

Front

An example of a quaternary structure

Back

Preview of the front of card 4

Card 5

Front

Which bonds are there in a Tertiary structure

Back

Preview of the front of card 5
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