Biomolecules Test

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Biomolecules Test - 47

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following carbohydrates develop blue colour on treatment with iodine solution?

A
Glucose

B
Sorbose

C
Starch

D
Fructose

Solution

Starch develops blue colour on treatment with iodine solution due to the formation of the starch-iodine complex. Iodine (in the form of $${ I }_5^-$$ ions) gets stuck in the coils of beta amylose molecules (beta amylose is a soluble starch).

The starch forces the iodine atoms into a linear arrangement in the central groove of the amylose coil. There is some transfer of charge between the starch and the iodine that changes the way electrons are confined and so, changes the spacing of the energy levels.

The iodine-starch complex has energy level spacing that is suitable for absorbing visible light giving the complex its intense blue color.
Question 2
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Which one of the following is not an attribute of enzymes ?

A
They are specific in nature

B
They are used in chemical reactions

C
They are thermolabile in nature

D
They are proteinaceous in nature

Solution
Question 3
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Which one of the following is not a pyrimidine base ?

A
Thymine

B
Guanine

C
Cytosine

D
Uracil

Solution
Question 4
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White prepipitate is formed in.

A
Millon's test

B
Ninhydrin test

C
Biuret test

D
Xanthoprotic test

Solution

In Millon's test, first the compound (to be tested) i.e, protein is nitrated by $$HNO_3$$ and then complexed with $$Hg(I)$$ and $$Hg(II)$$ ions. A red precipitate is obtained. However, if the protein contains tyrosine, sometimes initially a white precipitate is formed that turns red on heating.
Question 5
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______________ are found in nitrates, phosphates of metals.

A
Inorganic impurities

B
Organic impurities

C
Nutrients

D
Bacteria

Solution

Because these are found in the earth's crust and all the metal salts which are found in earth's crust are called inorganic salts
Question 6
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The chemical name of vitamin $${B}_{12}$$ is:

A
Calciferol

B
Tocopherol

C
Pyridoxine

D
Cyanocobalamine

Solution

The chemical name of vitamin $$B_12$$ is cyanocobalamine and it contains cobalt.
Question 7
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Identify disaccharides among the following:

(a) Stachyose (b) Lactose
(c) Maltose (d) Raffinose

A
$$a, b$$

B
$$ d, e$$

C
$$b, e$$

D
$$b, c$$

Solution

Stachyose: Tetrasaccharide consisting of two galactose units, one-glucose unit, and one fructose unit.

Lactose: Disaccharide sugar derived from galactose and glucose.

Maltose: Disaccharide formed from two units of glucose.

Raffinose: Trisaccharide composed of galactose, glucose, and fructose.

Hence, option D is correct.
Question 8
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An apoenzyme is a

A
Protein

B
Lipid

C
Sugar

D
Vitamin
Solution
Correct Option: A
Explanation:
An apoenzyme is a protein that forms an inactive enzyme.
The inactive part of the enzyme is called the the apoenzyme.
Upon binding with the cofactor or the prosthetic group, which may be organic or inorganic it becomes active.
The apoenzyme with the cofactor or prosthetic group forms the holoenzyme.
Hence, the apoenzyme is a protein.
Question 9
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Sucrose on hydrolysis gives:

A
glucose and maltose

B
glucose and lactose

C
glucose and fructose

D
only glucose

Solution

Sucrose gives glucose and fructose on hydrolysis with invertase enzyme.
$$\underset { sucrose }{ { C }_{ 12 }{ H }_{ 22 }{ O }_{ 11 } } +{ H }_{ 2 }O\xrightarrow [ ]{ Invertase } \underset { glucose }{ { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 } } +\underset { fructose }{ { C }_{ 6 }{ H }_{ 12 }{ O }_{ 6 } } $$
Question 10
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The enzymes are destroyed by

A
Cooling

B
Heating

C
Drying

D
None of the above

Solution

When the protein in the enzyme denatures then its function are lost. Some enzymes extracted from bacterias can sustain a temperature upto 70° c . Enzymes in human body can work to an optimum temperature of 42°c after that they get denatured.
So, option B is correct.

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Biomolecules Test - 47

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Biomolecules Test - 47

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Question 1

Glucose

Sorbose

Starch

Fructose

Solution

Question 2

They are specific in nature

They are used in chemical reactions

They are thermolabile in nature

They are proteinaceous in nature

Solution

Question 3

Thymine

Guanine

Cytosine

Uracil

Solution

Question 4

Millon's test

Ninhydrin test

Biuret test

Xanthoprotic test

Solution

Question 5

Inorganic impurities

Organic impurities

Nutrients

Bacteria

Solution

Question 6

Calciferol

Tocopherol

Pyridoxine

Cyanocobalamine

Solution

Question 7

$$a, b$$

$$ d, e$$

$$b, e$$

$$b, c$$

Solution

Question 8

Protein

Lipid

Sugar

Vitamin

Solution

Question 9

glucose and maltose

glucose and lactose

glucose and fructose

only glucose

Solution

Question 10

Cooling

Heating

Drying

None of the above

Solution

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