BIOL 1 key Q&A - Biochemistry - Flashcards in A Level and IB Biology

Created by: Anna
Created on: 15-05-13 21:27

Explain why a lactose intolerant man will have no glucose in his blood after consuming lactose?

No lactase; therefore lactose not digested, glucose not produced; no glucose absorbed therefor conc in blood stays the same.

1 of 10

Describe the structure of starch and explain how it is related to its function.

Formed from alpha-glucose; joined by condensation reactions to form glycosidic bonds; coild into a chain which allows large amounts of energy to me stored in small spaces, insoluble so doesn't effect osmosis

2 of 10

Describe how you could test the catalase preparation to show that it contained protein

Add biuret; lilac/purple/mauve

3 of 10

Avacados are fruit that contain large amounts of lipid. Describe how you would use a biochemical test to show that an avocado contains lipid.

Mix with ethanol then water; milky/white emulsion produced

4 of 10

What is the difference between a phospholipid and triglyceride molecule.

Hydrophobic tails; attracted to tails of other phospholipids; tails face inwards/away from water.

5 of 10

The primary structure of different proteins are different. Describe how.

Made up of different amino acids; Different order of amino acids; Different amino acids in different positions

6 of 10

Why is a buffer solution used in experiments involving proteins.

Buffer keeps the pH constant; pH will affect the binding of/shape of carrier proteins/active site of enzymes/denatures proteins.

7 of 10

Sucrase is an enzyme. It hydrolyzes sucrose during digestion. Name the products of this reaction.

Glucose & Fructose

8 of 10

Diabetes is a disease that can lead to an increase in blood glucose concentration. Some diabetics need insulin injections. Insulin is a protein so it cannot be taken orally. Suggest why insulin cannot be taken orally.

Broken down by enzymes/ digested/ denature/ too large to be absorbed

9 of 10

Describe the role of enzymes of the digestive system in the complete breakdown of starch.

Amylase - Starch to maltose; Maltase - maltose to glucose; Hydrolysis of glycosidic bond.

10 of 10

Other cards in this set

Card 2

Front

Describe the structure of starch and explain how it is related to its function.

Back

Card 3

Front

Describe how you could test the catalase preparation to show that it contained protein

Back

Card 4

Front

Avacados are fruit that contain large amounts of lipid. Describe how you would use a biochemical test to show that an avocado contains lipid.

Back

Card 5

Front

What is the difference between a phospholipid and triglyceride molecule.

Back

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BIOL 1 key Q&A - Biochemistry