Topic 1 : Biological molecules core practical Flashcards by A S

Q

How to test for Carbohydrate: glucose

A

Use Benedict’s solution at >= 70 degrees
positive: brick red precipitate (reducing sugar)
negative: stays blue

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

How to test for Carbohydrate: starch

A

Iodine at room temperature
positive: navy blue/black
negative: stays orange/brown

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

How to test for Lipids/Fats: vegetable oils

A

Ethanol at room temperature
positive: cloudy white emulsion
negative: stays colourless

How well did you know this?

1

Not at all

2

3

4

5

Perfectly

Q

How to test for Proteins: albumin

A

Biuret solution at room temp.
positive: purple
negative: stays pale blue+

How well did you know this?

1

Not at all

2

3

4

5

Perfectly