Unit 3- part D- Enzymes in action

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What are amino acids made out of?

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34 Terms

1

What are amino acids made out of?

an amine group, carbon atom, R group and carboxylic acid group

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2

What are proteins made out of?

residues of amino acids joined together by peptide bonds

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3

What is the structure of an amino acid?

amino group, R group, and carboxyl group

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4

How many types of amino acids are there?

20

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5

What is different in each of these types of amino acids?

the R group

<p>the R group</p>
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6

What happens when two amino acids join together?

hydrogen of an amine group and the hydroxyl group (-OH) meet. A peptide bond is formed between the two amino acids.

<p>hydrogen of an amine group and the hydroxyl group (-OH) meet. A peptide bond is formed between the two amino acids.</p>
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7

What is the name of this reaction between 2 amino acids?

Condensation reaction

<p>Condensation reaction</p>
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8

What product is formed in this reaction?

water

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9

What is the name when 2 amino acids join together by peptide bonds?

Dipeptide bond

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10

What is it called when many amino acids join together?

a polypeptide

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11

What is the primary structure?

the order in which the amino acids are present in the protein molecule

<p>the order in which the amino acids are present in the protein molecule</p>
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12

What is the secondary structure?

alpha helix or beta pleated sheet in certain areas of polypeptide chain are repeated or folded

<p>alpha helix or beta pleated sheet in certain areas of polypeptide chain are repeated or folded</p>
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13

What is the tertiary structure?

The way in which the secondary structures fold themselves into a three-dimensional shape

<p>The way in which the secondary structures fold themselves into a three-dimensional shape</p>
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14

What is the meaning of hydrophobic?

repels water

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15

What is the meaning of hydrophilic?

Attracted to water

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16

What is the active site?

the region on the enzyme where the substrate binds

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17

What is the substrate?

the substance on which an enzyme acts

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18

What does it mean when an enzyme denatures?

The active site has changed shape so the substrate can no longer fit in

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19

What are enzymes?

biological catalysts that speedup a reaction without being used up

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20

What is the activation energy?

the minimum amount of energy needed to start a chemical reaction

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21

How can you increase the rate of reaction?

-increase the concentration of the reactants
-increase the surface area
-increase the temperature
- add a catalyst

<p>-increase the concentration of the reactants<br>-increase the surface area<br>-increase the temperature<br>- add a catalyst</p>
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22

What does adding a catalyst do to a chemical reaction?

lowers the activation energy for the reaction so more collisions will have enough energy so more successful collisions

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23

How do you show how a reaction is endothermic or exothermic?

A reaction profile

<p>A reaction profile</p>
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24

When the active site bind with the substrate, what is this called?

enzyme substrate complex

<p>enzyme substrate complex</p>
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25

What does it mean when an enzyme has specificity?

The structure of an enzyme is such that it will only catalyse one particular chemical reaction with one particular substrate.

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26

What does a substrate have?

a specific shape which fits exactly into the active site on the enzyme molecule

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27

What is the meaning of induced fit?

an enzyme changes shape slightly when it binds its substrate to create the most effect fit for the enzyme

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28

How can temperature affect the enzyme?

A higher temperature generally makes for higher rates of reaction, enzyme-catalysed or otherwise. However, either increasing or decreasing the temperature outside of a tolerable range can affect chemical bonds in the active site

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29

How can pH effect enzymes?

For most enzyme-catalysed reactions, if the pH is either very low (strongly acidic) or very high (strongly alkaline), the enzyme can become denatured.

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30

How can increasing the substrate or enzyme concentration affect enzyme activity?

Increasing either the substrate or enzyme concentration will mean that there will be more particles in a given volume of solution. The particles will therefore be closer together and so will collide more often. This means more substrate molecules will bind with the enzyme molecules in a given time.

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31

Why is it important to measure the initial reaction rates?

This is because as a reaction proceeds, reactants are being used up and products are being formed.

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32

What is fermentation?

the process by which glucose is converted into ethanol and carbon dioxide in the presence of yeast.

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33

When does fermentation take place?

absence of oxygen

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34

What are the conditions of fermentation?

a temperature of 35 °C

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