Biomolecules Test

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Biomolecules Test - 85

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Weekly Quiz Competition

Question 1
1 / -0

The change is optical rotation with time of freshly prepared solutions of sugar, is known as

A
Specific rotation

B
inversion

C
rotatory motion

D
mutaroatation
Solution
- By definition $$\text{mutarotation is the change in the optical rotation with time that occurs by epimerization}$$ (that is the change in the equilibrium between two epimers, when the corresponding stereocenters interconvert). Cyclic sugars show mutarotation as α and β anomeric forms interconvert.
Question 2
1 / -0

The cogulation of protein is called

A
dehydration

B
decay

C
deamination

D
denaturing

Solution

$$\text{The coagulation of protein is called denaturing. }$$Denaturation of proteins involves the disruption and possible destruction of both the secondary and tertiary structures. Since denaturation reactions are not strong enough to break the peptide bonds, the primary structure (sequence of amino acids) remains the same after a denaturation process.

Option D is correct.
Question 3
1 / -0

The aqueous solution of carbohydrate gave dark blue colour with iodine,
the carbohydrate is

A
starch

B
sucrose

C
fructose

D
glucose

Solution

Starch solution gives blue colour with iodine solution. Starch is a reducing sugar.
Question 4
1 / -0

The total number of basic groups in the following form of lysine

A
0

B
1

C
2

D
3

Solution

$$-\overset{\overset O{\parallel}}C-O^-$$ and $$-NH_2$$ are the basic groups in $$lysine.$$ Amine is always basic and $$-\overset{\overset O{\parallel}}C-O^-$$ is the conjugate base of

$$-COOH$$ group.

Thus, a total of $$two$$ basic groups in the given form of lysine is present
Question 5
1 / -0

Which of the following is found cod-liver oil

A
Vitamin C

B
Vitamin E

C
Vitamin A

D
Vitamin $$ B_{1} $$

Solution

$$\text{cod-liver oil is used as a source of vitamin A and vitamin D.}$$ Cod liver oil can be obtained from eating fresh cod liver or by taking supplements. It is also used as a source of fat called omega-3 for heart health, depression, arthritis, and other conditions, but there is no good scientific evidence to any use.

Option C is correct.
Question 6
1 / -0

The enzyme pepsin hydrolyses

A
protein to amino acid

B
fats to fatty acid

C
glucose to ethyl alcohol

D
polusachharides to monosaccharides

Solution

$$\text{Pepsin hydrolyses proteins to amino acid(polypeptide chains) and initiates protein digestion in the digestion process}$$ $$\text{in humans. }$$
Question 7
1 / -0

Select the carbohydrate which gives only glucose on hydrolysis:

A
sucrose

B
lactose

C
maltose

D
galactose
Solution
Lactose is made of glucose and galactose.
galactose is itself a monosaccharide.
Sucrose is made of glucose and fructose.
$$\text{Maltose is made of 2 glucose units.}$$
So, $$C \ (maltose)$$ is correct which gives only glucose on hydrolysis.
Question 8
1 / -0

Functionally active form of vitamin D is:

A
cholecalciferol

B
ergocalciferol

C
dehydro cholesterol

D
calcitriol

Solution

$$\text{calcitriol (also known as 1,25-dihydroxycholecalciferol), the biologically active form of vitamin D.}$$ Calcitriol circulates as a hormone in the blood, having a major role regulating the concentration of calcium and phosphate, and promoting the healthy growth.

Option D is correct.
Question 9
1 / -0

Biuret test is not given by

A
proteins

B
urea

C
polypeptide

D
carbohydrates

Solution

$$\text{Biuret test is the characteristic test for the }amide \ linkage.$$ and as we know that amide linkage is present in $$\text{urea, polypeptides and proteins (polypeptides themselves).}$$ Since $$\text{there is no amide linkage in}$$ $$carbohydrates$$, so they do not give this test.

Option D is correct.
Question 10
1 / -0

Which of the following is not present in a nucleotide?

A
Cytosine

B
Guanine

C
Adenine

D
Tyrosine

Solution

A nucleotide is one of the structural components, or building blocks, of DNA and RNA. A nucleotide consists of a base $$\text{(one of four chemicals: adenine, thymine, guanine, and cytosine) plus a molecule of sugar and one}$$ $$\text{of the phosphoric acid }$$$$.Tyrosine\text{ is not present in a nucleotide.}$$
Hence the correct option is D.

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Re-Attempt Weekly Quiz Competition

Biomolecules Test - 85

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Biomolecules Test - 85

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SHARING IS CARING

Question 1

Specific rotation

inversion

rotatory motion

mutaroatation

Solution

Question 2

dehydration

decay

deamination

denaturing

Solution

Question 3

starch

sucrose

fructose

glucose

Solution

Question 4

0

1

2

3

Solution

Question 5

Vitamin C

Vitamin E

Vitamin A

Vitamin $$ B_{1} $$

Solution

Question 6

protein to amino acid

fats to fatty acid

glucose to ethyl alcohol

polusachharides to monosaccharides

Solution

Question 7

sucrose

lactose

maltose

galactose

Solution

Question 8

cholecalciferol

ergocalciferol

dehydro cholesterol

calcitriol

Solution

Question 9

proteins

urea

polypeptide

carbohydrates

Solution

Question 10

Cytosine

Guanine

Adenine

Tyrosine

Solution

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