Question 1

The enzyme lysozyme secreted from tear glands forms deposits on contact lenses.

Which ingredient would be effective in a contact lens cleaner for removing these deposits?

  A  

ethanol

  B  

lysosomes

  C  

pH buffers

  D  

proteases

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Question 2

A group of students was given a 1% solution of an unknown digestive enzyme.

They were also given three tubes containing an identical mixture of foods.

The students carried out a different biochemical test on each tube before and after adding the unknown enzyme. Their results are shown in the table below.

Name the type of enzyme the students used.

  A  

protease


  B  

carbohydrase

  C  

lipase

  D  

cellulase

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Question 3

Human pancreatic lipase breaks the bonds between fatty acids and glycerol.

What name is given to this reaction?

  A  

condensation

  B  

esterification

  C  

hydration

  D  

hydrolysis

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Question 4

What is the primary function of salivary amylase in the digestion of starch?

  A  

emulsifies starch into simpler sugars

  B  

hydrolyses starch into maltose and glucose

  C  

begins the chemical breakdown of starch into maltose

  D  

converts maltose into monosaccharides

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Question 5

Which enzyme completes the digestion of maltose in the human digestive system?

  A  

salivary amylase

  B  

lactase

  C  

maltase

  D  

pancreatic amylase

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Question 6

How are fatty acids and monoglycerides absorbed into the epithelial cells lining the ileum?

  A  

they cannot diffuse across the cell-surface membrane due to being polar molecules

  B  

they diffuse across the cell-surface membrane due to being non-polar molecules

  C  

they are actively transported against a concentration gradient

  D  

they are absorbed as part of chylomicrons

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Question 7

Why are the villi and microvilli in the ileum important?

  A  

they produce digestive enzymes

  B  

they secrete bile for lipid digestion

  C  

they produce mucus for protecting the intestinal lining

  D  

they increase the surface area for absorption

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Question 8

What is the function of lipases in the digestive system?

  A  

to break down proteins into amino acids

  B  

to emulsify lipids into smaller droplets

  C  

to convert monoglycerides into triglycerides

  D  

to hydrolyse lipids into glycerol and fatty acids

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Question 9

Which of the following enzymes is not involved in the digestion of carbohydrates?

  A  

pancreatic amylase

  B  

pepsin

  C  

sucrase

  D  

lactase

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Question 10

What do endopeptidases in the digestive system specifically break down?

  A  

terminal amino acids of proteins

  B  

the glycosidic bonds in carbohydrates

  C  

peptide bonds in the central region of protein molecules

  D  

fatty acids in lipids

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