Lactose Intolerance- Miss Hadgkiss

Half Term Tasks

1). Research racial incidence of lactose intolerance.
2). What are the tests for lactose intolerance and how are they interpreted. (p.55 Hodder may help)
3). Answer the question below.

Lactose intolerance website links.

http://www.nationalstemcentre.org.uk/elibrary/resource/912/converting-milk-products-using-lactase

http://au.lifestyle.yahoo.com/health/reference/article/-/8651743/lactose-intolerance/

http://www.netdoctor.co.uk/digestivehealth/lactoseintolerance.html

http://www.nlm.nih.gov/medlineplus/ency/article/003500.html

Q1. Lactose is present in milk. It is broken down by lactase into glucose and galactose. This is

shown in the equation.

(a) Name the type of reaction shown in the equation.

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(1)

  

(b) The molecular formula of galactose is C6H12O6. What is the molecular formula of lactose?

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(2)

  

(c) Doctors use a lactose tolerance test to find out if a person is lactose intolerant. In this test,

the person is given a solution of lactose to drink. Blood glucose concentration is then

measured over the next two hours.

A lactose tolerance test was carried out on a healthy man who was lactose tolerant, and

on a man who was lactose intolerant. The results for the first hour are shown in the table.

(i) The blood glucose concentration changed in the healthy man after he had taken the

test. Describe how.

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(ii) Explain the results for the lactose intolerant man.

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