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AQA A-level Biology > Topic 3: Protein Digestion > Flashcards

Topic 3: Protein Digestion Flashcards

1
Q

How are proteins hydrolysed?

A

By a group of enzymes called peptidases

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2
Q

what group of enzymes hydrolyse proteins?

A

Peptidases

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3
Q

How many types of peptidases are there?

A

3

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4
Q

Name the 3 types of peptidases

A

Endopeptidase
Exopeptidases
Dipeptidases

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5
Q

What do endopeptidases do?

A

Hydrolyse peptide bonds inside a protein molecule and break it into peptide fragments

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6
Q

Name 2 endopeptidases

A

Pepsin
Trypsin

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7
Q

Where is pepsin produced?

A

The cells of the stomach lining

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8
Q

What is pepsin?

A

An endopeptidase in the stomach

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9
Q

What ph does pepsin work best at?

A

2

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10
Q

Which endopeptidase works best at ph 2?

A

Pepsin

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11
Q

What is trypsin?

A

An endopeptidase produced by the pancreas but released in small intestine

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12
Q

Where is trypsin produced?

A

In the pancreas

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13
Q

where is trypsin released?

A

Small intestine

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14
Q

What is the optimum ph of trypsin?

A

7 0r 8

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15
Q

Which endopeptidase works best at ph 7 or 8?

A

Trypsin

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16
Q

What does an Exopeptidase do?

A

Hydrolyse peptide bonds at the end of a protein molecule releasing a single amino acid or dipeptide

17
Q

What is released after an Exopeptidase hydrolyses a protein?

A

A single amino acid or dipeptide

18
Q

Where are Exopeptidases produced?

A

Epithelial cells

19
Q

What does a Dipeptidase do?

A

They hydrolyse the peptide bond in a dipeptide and release 2 amino acids

20
Q

What are Dipeptidases?

A

Exopeptidases that work on dipeptides

21
Q

What is released after Dipeptidases hydrolyse proteins?

A

2 single amino acids

22
Q

Where are Dipeptidases produced?

A

Epithelial cells

23
Q

Dipeptidases are a type of what?

A

Exopeptidase

24
Q

Why are Exopeptidase and dipeptidase could in epithelial cells that line the ileum and not different locations like endopeptidases?

A

They are membrane bound enzymes

AQA A-level Biology (25 decks)

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