Higher human biology Unit 1.6

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All the biochemical reactions that occur within a living cell.
metabolism
1 of 12
When simple molecules are built up into more complex molecules.
anabolic reaction
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When a large complex molecule is broken down into smaller simpler molecules
catabolic reaction
3 of 12
The energy to needed to break the chemical bonds needed to start a reaction
activation energy
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what term is used to describe that an enzyme can only act on one substrate. The active site is a complementary shape to the substrate.
specific
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When the substrate comes in contact with the active site the active site changes shape slightly.
induced fit
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How does the enzyme ensure that two substrates will combine in a biosynthetic reaction
The active site holds the substrates in the correct orientation in an induced fit.
7 of 12
Following a reaction how are the products released from the active site?
The affinity of the products is low so they are released.
8 of 12
What is the relationship between increasing substrate concentration and reaction rate.
As the substrate concentration increases the reaction rate increases.
9 of 12
Why will the reaction rate plateau despite the substrate concentration still increasing?
The enzyme concentration has become a limiting factor as all the active sites are occupied.
10 of 12
How does a competitive inhibitor slow down the reaction rate?
Molecules of inhibitor compete for the active site with the substrate.
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How does the action of a non competitive inhibitor slow down reaction rate?
Molecules of inhibitor bind to a different site on the enzyme, changing the shape of the active site. The substrate will no longer fit the active site.
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Other cards in this set

Card 2

Front

When simple molecules are built up into more complex molecules.

Back

anabolic reaction

Card 3

Front

When a large complex molecule is broken down into smaller simpler molecules

Back

Preview of the front of card 3

Card 4

Front

The energy to needed to break the chemical bonds needed to start a reaction

Back

Preview of the front of card 4

Card 5

Front

what term is used to describe that an enzyme can only act on one substrate. The active site is a complementary shape to the substrate.

Back

Preview of the front of card 5
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