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Worksheets

chemical reactions in living organisms

Total questions: 15

Worksheet time: 15mins

Name
Class
Date
1.

The pepsin enzyme can be added to the tube number …… to digest its contents.

a)

1

b)

2

c)

3

d)

4

2.

Tube number 1 is similar to ………. In the digestive system of human.

a)

Stomach

b)

small intestine

c)

esophagus

d)

the mouth

3.

If pepsin enzyme was added to the tube number 4, proteins will not be digested because:

a)

insuitability of pH

b)

insuitability of temperature

c)

pepsin does not digest proteins

d)

all the previous

4.

If the temperature of tube 3 is adjusted, what is the enzyme that can be added to digest starch?

a)

Pepsin

b)

Amylase

c)

Trypsin

d)

Maltase

5.

We can make sure that, tube number 1 contains proteins by adding ………….. .

a)

Benedict̕ reagent

b)

iodine solution

c)

Sudan-4 reagent

d)

Biuret̕ s reagent

6.

If Sudan-4 reagent is added to the tube number 2, it gives ………….. colour.

a)

dark blue

b)

red

c)

viloet

d)

orange

7.

The structures A and B are ………………. .

a)

monosaccharides

b)

disaccharides

c)

polysaccharides

d)

amino acids

8.

One of A or B should be ………….. .

a)

Fructose

b)

ribose

c)

galactose

d)

glucose

9.

If the disaccharide (2) is maltose, A and B should be ………….. .

a)

glucose and glucose

b)

glucose and fructose

c)

glucose and galactose

10.

If the disaccharide (2) is found in the milk, A and B should be ………….. .

a)

glucose and fructose

b)

glucose and glucose

c)

glucose and galactose

11.

Most enzymes work more active at temperature ............. oC

a)

25

b)

37

c)

45

d)

60

12.

Most enzymes work at hydrogen potential equals

a)

3.4

b)

5.4

c)

7.4

d)

9.4

13.

If you know that the pepsin enzyme helps in the digestion of proteins in stomach. which of the following graphs illustrates what happens to the pepsin enzyme if PH value increased in the stomach.

a)
b)
c)
d)
14.

From the forms of the anabolic process inside the living organisms is the

a)

oxidation

b)

decay

c)

polymerization

d)

digestion

15.

All the following statements are correct except that

a)

all proteins are enzymes

b)

all enzymes are proteins

c)

all enzymes contain peptide bonds

d)

all proteins contain nitrogen element