Q1.
Bread contains starch, protein and fat.
(a)     Complete each sentence by choosing the correct words from the box.
amino acids	protein	
fat	starch	
fatty acids	sugar	
 
          Amylase speeds up the digestion of _________________ . The product of this digestion
          is ______________ . Protease speeds up the digestion of _______________ .
          The product of this digestion is _______________________ .
(4)
(b)     Why do molecules of starch, protein and fat need to be digested?
______________________________________________________________
______________________________________________________________
(2)
(c)     In which part of the digestive system does the digestion of starch begin?
Draw a ring around your answer.
large intestine       mouth              small intestine         stomach
(1)
(d)     What do we call substances like amylase and protease which speed up chemical reactions?
______________________________________________________________
(1)
(Total 8 marks)
Q2.
The diagram below shows the human digestive system.
 
(a)     (i)      What is Organ A?
Draw a ring around the correct answer.
gall bladder                liver                stomach
(1)
(ii)     What is Organ B?
Draw a ring around the correct answer.
large intestine                pancreas                small intestine
(1)
(b)     Digestive enzymes are made by different organs in the digestive system.
Complete the table below putting a tick (✓) or cross (✕) in the boxes.
The first row has been done for you.
 
 	Organ producing enzyme	
 	salivary glands	stomach	pancreas	small intestine	
Enzyme	amylase	✓	✕	✓	✓	
	lipase	 	 	 	 	
	protease	 	 	 	 	
(2)
(c)     The stomach also makes hydrochloric acid.
How does the acid help digestion?
___________________________________________________________________
___________________________________________________________________
(1)
(d)     Draw one line from each digestive enzyme to the correct breakdown product.
 
Digestive enzyme	 	Breakdown products	
 	 	 	
 	 	amino acids.	
Amylase breaks down starch into……	 	 	
 	 	bases.	
Lipase breaks down fats into…	 	 	
 	 	fatty acids and glycerol.	
Protease breaks down proteins into…	 	 	
 	 	sugars.	
(3)
(Total 8 marks)
Q3.
Diagrams A, B and C show cells from different parts of the human body, all drawn to the same scale.
A B C
 
(a)     Which cell, A, B or C, appears to be best adapted to increase diffusion into or 
out of the cell?       
Give one reason for your choice.
___________________________________________________________________
___________________________________________________________________
(1)
(b)     (i)      Cell C is found in the salivary glands.
Name the enzyme produced by the salivary glands.
______________________________________________________________
(1)
(ii)     Use information from the diagram to explain how cell C is adapted for producing this enzyme.
______________________________________________________________
______________________________________________________________
______________________________________________________________
______________________________________________________________
(2)
(Total 4 marks)

Mark schemes
Q1.
(a)     in sequence
starch
1
sugar
1
protein
1
amino acids
1
(b)     (too) large or insoluble
do not accept “breaking up”
do not accept complex
accept ‘need to make molecules
smaller / soluble’ – reverse argument
1
          cannot be absorbed or
cannot enter blood or
cannot pass through wall / lining of
intestine / gut or villi
“body” not enough
not large intestine
1
(c)     mouth
accept positive indication
1
(d)     enzymes
allow catalysts
do not accept catalase
1
[8]
Q2.
(a)     (i)      stomach
1
(ii)     small intestine
1
(b)    
 
 	salivary glands	stomach	pancreas	small intestine	
amylase	✓	✕	✓	✓	
lipase	✕	✕	✓	✓	
protease	✕	✓	✓	✓	
1 mark per correct row
or
if no correct row max 1 mark for any one correct column
2
(c)     enzyme / protease / pepsin most effective in acid conditions / low pH
accept optimum / correct pH
do not accept ref to incorrectly named enzymes
ignore killing bacteria
ignore acid breaks down food
1
(d)            Enzyme            Breakdown products
 
3
[8]
Q3.
(a)    B
no mark for “B” alone, the mark is for B and the explanation.
large(r) surface / area or large(r) membrane
accept reference to microvilli
ignore villi / hairs / cilia
accept reasonable descriptions of the surface eg folded membrane / surface
do not accept wall / cell wall
1
(b)    (i)      any one from:
•        (salivary) amylase
•        carbohydrase
1
(ii)     many ribosomes
do not mix routes. If both routes given award marks for the greater.
1
ribosomes produce protein
accept amylase / enzyme / carbohydrase is made of protein
or
(allow)
many mitochondria      (1)
mitochondria provide energy to build / make protein      (1)
accept ATP instead of energy
1
[4]