U.1 K.A.6 Metabolic Pathways Flashcards

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1
Q

What name is given to the thousands of biochemical reactions that occur in living cells?

A

Metabolism

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2
Q

The quantity of energy consumed by an organism per unit time is a measure of what rate?

A

Metabolic rate

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3
Q

Name two types of metabolic pathway.

A
  • Anabolic

- Catabolic

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4
Q

Which type of metabolic pathway involves the breakdown of complex molecules to simpler ones?

A

Catabolic

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5
Q

Which type of metabolic pathway involves the build up of complex molecules from simpler ones?

A

Anabolic

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6
Q

Which type of metabolic pathway releases energy as it is breaking complex molecules down?

A

Catabolic

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7
Q

Which type of metabolic pathway requires energy as it builds up small molecules to complex molecules?

A

Anabolic

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8
Q

In a metabolic pathway, what do two opposing arrows mean?

A

The reaction is reversible

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9
Q

Metabolic reactions sometimes have places where steps can be bypassed, what are these pathways known as?

A

Alternative routes

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10
Q

Give three properties of a catalyst.

A
  • Increases the rate of reaction
  • Remains unchanged at the end
  • Lowers the activation energy
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11
Q

What name is given to biological catalysts?

A

Enzymes

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12
Q

What state is reached when two reactants have bonds broken and they are in a position that is unstable and ready to form a product?

A

Transition rate

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13
Q

What substance are enzymes made of?

A

Protein

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14
Q

What name is given to the area on an enzyme that meets with the substrate?

A

Active site

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15
Q

What determines the shape of the active site?

A

The sequence of amino acids in the polypeptide chain that makes up the enzyme molecule

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16
Q

Give the word that is used to describe the fact that one enzyme fits one substrate?

A

Specific

17
Q

Give the term that is used to describe the fact that the active site has a strong attraction for the substrate.

A

High affinity

18
Q

Once the enzyme has broken the substrate/built it up and formed the product, how is the attraction for the active site described?

A

Low affinity

19
Q

In order for the enzyme’s active site to fit the substrate more closely, the shape of the active site and enzyme change slightly. What is this called?

A

Induced fit

20
Q

Fill in this missing gap:

“The shape of the active site determines the o______ of reactants”

A

Orientation

21
Q

In an enzyme controlled reaction, the reaction rate will increase as the substrate concentration increases up until a certain point. After that the rate of reaction does not increase, why is this?

A

Because all of the active sites on the enzymes are occupied

22
Q

What can be done to increase the rate of an enzyme controlled reaction once all of the active sites on the enzyme are occupied and substrate has already has already been increased?

A

Add more of the enzyme to the reaction

23
Q

What name is given to a substance that decreases the rate of an enzyme-controlled reaction?

A

An inhibitor

24
Q

Name two types of inhibitor.

A
  • Competitive inhibitor

- Non-competitive inhibitor

25
Q

Which inhibitor binds to the active site and competes with the substrate in an enzyme controlled reaction?

A

Competitive inhibitor

26
Q

Why is the competitive inhibitor able to join to the active site of an enzyme?

A

Because it has a similar shape to the substrate

27
Q

What happens to the rate of reaction in an enzyme controlled reaction that is affected by a competitive inhibitor?

A

Decreases the rate of reaction but doesn’t stop it altogether because the substrate can still bind sometimes

28
Q

How could the effects of a competitive inhibitor be reversed?

A

Increase the substrate concentration

29
Q

Where does a non-competitive inhibitor bind to?

A

an allosteric site (site away from the active site)

30
Q

What does a non-competitive inhibitor do to the shape of an enzyme’s active site?

A

Changes the shape of the active site

31
Q

Why does a reaction affected by a non-competitive inhibitor stop altogether?

A

Because the shape of the active site has changed permanently and it no longer recognises the substrate

32
Q

When an end product is made in a metabolic pathway some of the product goes back and inhibits an enzyme at the start of the pathway, what is this called?

A

End-product inhibition