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Food Tests

Total questions: 55

Worksheet time: 2hrs 35mins

Name
Class
Date
1.

Which of the following tests for starch?

a)

Iodine

b)

Benedict's

c)

Biuret

d)

Emulsion

2.

Which of the following tests for protein?

a)

Iodine

b)

Benedicts

c)

Biuret

d)

Emulsion

3.

Which of the following tests for glucose?

a)

Iodine

b)

Benedicts

c)

Biuret

d)

Emulsion

4.

When starch is present iodine turns...

a)

purple

b)

blue-black

c)

orange

d)

brick red

5.

When protein is present Biuret turns...

a)

purple

b)

blue-black

c)

orange

d)

brick red

6.
When large amounts of glucose is present Benedicts turns...
a)
purple
b)
blue-black
c)
brick-red
d)
green
7.

A negative test for starch will cause Iodine to stay...

a)

orange/red

b)

blue

c)

black

d)

brick red

8.

A negative test for protein will cause Biuret to stay...

a)

brick red

b)

blue

c)

black

d)

orange

9.

A negative test for glucose will cause Benedicts to stay...

a)

brick red

b)

blue

c)

black

d)

orange

10.

Which chemicals did you mix to test for proteins - biuret test?

a)

Ethanol and water

b)

Iodine and potassium permanganate

c)

Benedicts Solution

d)

Sodium Hydroxide and Copper Sulphate

11.

How do you test for lipids?

a)

By using Ethanol and water

b)

By using Benedicts solution

c)

By using Iodine

d)

By using Biuret test

12.

What is a positive result for the lipid emulsion test?

a)

milky white colour

b)

clear

c)

yellow

d)

green

13.

I am used to test for the presence of complex carbohydrates (starch)

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

14.

I am used to test for the presence of simple carbohydrates (sugars)

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

15.

I am used to test for the presence of protein

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

16.

I am used to test for the presence of lipids (fats)

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

17.

If I am positive, I will produce a precipitate

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

18.

If I am positive, I will turn red

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

19.

If I am positive, I will turn dark blue/black

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

20.

If I am positive, I will turn purple

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

21.

In this experiment, you must put your test tubes into a hot water bath

a)

Benedict's Test

b)

Biurets Test

c)

Iodine Test

d)

Ethanol Emulsion Test

22.

Which of the following tests for starch?

a)

Iodine Solution

b)

Benedict's Solution

c)

Biuret Solution

d)

Ethanol

23.

Which of the following tests for protein?

a)

Iodine Solution

b)

Benedict's Solution

c)

Biuret Solution

d)

Ethanol

24.

When protein is present Biuret turns...

a)

purple

b)

blue-black

c)

orange

d)

blue

25.

In a negative test for starch, what colour will iodine solution be?

a)

yellow-brown

b)

blue

c)

black

d)

blue-black

26.

A negative test for glucose will cause Benedicts to stay...

a)

brick red

b)

blue

c)

black

d)

yellow

27.

If you drop iodine solution on bread, it changes to Black. What does this show?

a)

Bread contains protein

b)

Bread contains sugar

c)

Bread contains starch

d)

Bread contains lipids?

28.

How do you test for lipids?

a)

By using Ethanol and water

b)

By using Benedicts solution

c)

By using Iodine solution

d)

By using Biuret test

29.

The building blocks of proteins are

a)

carbohydrates

b)

amino acids

c)

sugars

d)

fatty acids

30.
Which test requires heat?
a)
Benedicts
b)
Biuret
c)
Iodine
31.

How do you test for lipids?

a)

By using Ethanol

b)

By using Benedicts solution

c)

By using Iodine Solution

d)

By using Biuret test

32.

This photo represents a

a)

negative test for glucose

b)

negative test for protein

c)

positive test for starch

d)

positive test for glucose

33.

The test tubes in the photo represent a negative and positive result for

a)

Benedict's with glucose

b)

Biuret with protein

c)

Iodine with starch

d)

Ethanol with fat

34.

Which of the following tests for lipids?

a)

Iodine solution

b)

Benedicts solution

c)

Biuret test

d)

Ethanol

35.

Which of the following tests for Glucose (sugar)?

a)

Iodine solution

b)

Benedict's solution

c)

Biuret test

d)

Ethanol

36.

When lipid (fat) is present ethanol turns...

a)

Clear

b)

Cloudy/White

c)

Black

d)

Orange

37.

When Starch is present Iodine Solution turns...

a)

Clear

b)

Cloudy/White

c)

Black

d)

Orange

38.

The building blocks of lipids are

a)

Starches

b)

Fatty acids and Glycerol

c)

Sugars

d)

Amino Acids

39.

The building blocks of starch are

a)

glycerol

b)

amino acids

c)

sugars

d)

fatty acids

40.

What tests for starch?

a)

Benedict's Solution

b)

Iodine Solution

c)

Iodine

d)

Ethanol

41.
Which biomolecule turns iodine solution black?
a)
complex carbohydrate (polysaccharide)
b)
protein
c)
simple carbohydrate (monosaccharide)
d)
lipid
42.
Which reagent is used to test for complex carbohydrates (polysaccharides)?
a)
iodine solution
b)
biuret solution
c)
Benedict's solution
d)
Sudan III solution
43.
Which biomolecule does Benedict's solution test for?
a)
simple carbohydrate (monosaccharides)
b)
complex carbohydrates (polysaccharides)
c)
proteins
d)
lipids
44.
Which reagent is used to test for simple carbohydrates (monosaccharides)?
a)
iodine solution
b)
Benedict's solution
c)
Biuret solution
d)
Sudan III solution
45.
Which reagent is used to test for lipids?
a)
iodine solution
b)
Benedict's solution
c)
Biuret solution
d)
Sudan III solution
46.
Which biomolecule does Sudan III solution test for?
a)
simple carbohydrate (monosaccharides)
b)
complex carbohydrates (polysaccharides)
c)
proteins
d)
lipids
47.
Which reagent is used to test for proteins?
a)
iodine solution
b)
Benedict's solution
c)
Biuret solution
d)
Sudan III solution
48.
Which biomolecule does biuret solution test for?
a)
simple carbohydrate (monosaccharides)
b)
complex carbohydrates (polysaccharides)
c)
proteins
d)
lipids
49.
Which biomolecule is this lab testing for?
a)
simple carbohydrate (monosaccharide)
b)
complex carbohydrate (polysaccharide)
c)
protein
d)
lipid
50.

Which biomolecules did we test for in the lab?

a)

simple carbohydrates (monosaccharides)

b)

lipids

c)

proteins

d)

nucleic acids

e)

complex carbohydrates (polysaccharides)

51.
What color does iodine turn in the presence of a complex carbohydrate (polysaccharide)?
a)
range from yellow to red
b)
blue/black
c)
purplish/violet
d)
red
52.
What color does Benedict's solution turn in the presence of a simple carbohydrate (monosaccharide)?
a)
range from yellow to red
b)
blue/black
c)
purplish/violet
d)
red
53.
What color does biuret solution turn in the presence of a protein?
a)
range from yellow to red
b)
blue/black
c)
purplish/violet
d)
red
54.

What color does Sudan III solution turn in the presence of a lipid?

a)

range from yellow to red

b)

blue/black

c)

purplish/violet

d)

red globules

55.
Tara conducted several tests on a mystery solution.  Her results were as follows:
*Biuret's = purplish/violet; *Benedict's = orange;  *Sudan III = yellow; *Iodine = black.
Which biomolecules were present in the mystery solution?
a)
protein & carbohydrate
b)
protein & lipid
c)
carbohydrate & lipid
d)
protein, carbohydrate, & lipid

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