chemical reactions in living organisms

1.

Multiple Choice

1 min

1 pt

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

1

2

3

4

2.

Multiple Choice

1 min

1 pt

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

Stomach

small intestine

esophagus

the mouth

3.

Multiple Choice

1 min

1 pt

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

insuitability of pH

insuitability of temperature

pepsin does not digest proteins

all the previous

4.

Multiple Choice

1 min

1 pt

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

Pepsin

Amylase

Trypsin

Maltase

5.

Multiple Choice

1 min

1 pt

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

Benedict̕ reagent

iodine solution

Sudan-4 reagent

Biuret̕ s reagent

6.

Multiple Choice

1 min

1 pt

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

dark blue

red

viloet

orange

7.

Multiple Choice

1 min

1 pt

The structures A and B are ………………. .

monosaccharides

disaccharides

polysaccharides

amino acids

8.

Multiple Choice

1 min

1 pt

One of A or B should be ………….. .

Fructose

ribose

galactose

glucose

9.

Multiple Choice

1 min

1 pt

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

glucose and glucose

glucose and fructose

glucose and galactose

10.

Multiple Choice

1 min

1 pt

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

glucose and fructose

glucose and glucose

glucose and galactose

11.

Multiple Choice

1 min

1 pt

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

25

37

45

60

12.

Multiple Choice

1 min

1 pt

Most enzymes work at hydrogen potential equals

3.4

5.4

7.4

9.4

13.

Multiple Choice

1 min

1 pt

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.

14.

Multiple Choice

1 min

1 pt

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

oxidation

decay

polymerization

digestion

15.

Multiple Choice

1 min

1 pt

All the following statements are correct except that

all proteins are enzymes

all enzymes are proteins

all enzymes contain peptide bonds

all proteins contain nitrogen element

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