carbohydrate

Question 1

Explain how digestion of starch in the gut (small intestine) leads to an increase in the concentration of glucose in the blood. Details of co-transport are not required

Answer 1

Hydrolysed by enzymes / hydrolysed by amylase / maltase;

If named enzyme given, it must relate to the correct substrate

2. Produces glucose (in the gut);
3. Small enough to cross the gut wall (into the blood) / monomers / monosaccharides (can) cross the gut wall (into the blood);

Question 3

Suggest a method you could use to estimate the concentration of glucose in several different solutions that all turned brick red with Benedict’s reagent in 3 minutes.

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Answer 3

Time how long it takes to go brick red;

2. Weigh precipitate

Question 4

Mucus also contains glycoproteins. One of these glycoproteins is a polypeptide with the sugar, lactose, attached.

Describe how lactose is formed and where in the cell it would be attached to a polypeptide to form a glycoprotein.

Answer 4

Glucose and galactose;

Ignore α or β for glucose

2. Joined by condensation (reaction);
3. Joined by glycosidic bond;
4. Added to polypeptide in Golgi (apparatus);;