Biomolecules Test

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Biomolecules Test - 8

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Weekly Quiz Competition

Question 1
1 / -0.25

Enzymes belong to the class of compounds called:

A
Polypeptides

B
Polysaccharides

C
Hydrocarbons

D
Polynitrogen heterocyclic compounds

Solution

Enzymes are proteins that act as catalysts and help complex reactions occur everywhere in life. These are polypeptides. Chemically, peptide linkage is an amide formed between –COOH group and –NH2 group.
Question 2
1 / -0.25

In aqueous solution, the carboxyl group can lose a proton and amino group can accept a proton, giving rise to a dipolar ion known as:

A
L-amino acids

B
D-amino acids

C
Peptide bond

D
Zwitter ion

Solution

The correct answer is Option D
In aqueous solution, the carboxyl group can lose proton and the amino group can accept proton, giving rise to a dipolar ion known as zwitterion. In zwitter ionic form, amino acids show amphoteric behaviour as they react both with acids and bases.
Question 3
1 / -0.25

The symptoms of retinol excess are

A
bone fragility

B
Fibrous Protein

C
weakness

D
all of these

Solution

The correct answer is option B
Fibrous Protein
When polypeptide chains run parallel &are held together by hydrogen and disulphide bonds, then ber, rod or wire-like structure is formed. They are shaped like fibers; hence called Fibrous protein These proteins are water-insoluble.
Question 4
1 / -0.25

Amino acid are connected to each other by:

A
Hydrogen bond

B
Carbon bond

C
Polydiester bond

D
Peptide bond

Solution

Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid.
Question 5
1 / -0.25

The active form of vitamin D is:

A
Calcidiol

B
Calcitriol

C
Cholecalciferol

D
Any of the above

Solution

The correct answer is option B
Calcitriol , is the hormonally active metabolite of vitamin D which has three hydroxyl groups.Calcitriol increases the level of calcium (Ca2+) in the blood by increasing the uptake of calcium from the gut into the blood, increasing reabsorption of calcium by the kidneys, and possibly increasing the release of calcium into the blood from bone. Vitamin D has a significant role in calcium homeostasis and metabolism. Its discovery was due to effort to find the dietary substance lacking in children with rickets (the childhood form of osteomalacia).
Question 6
1 / -0.25

Which of the following compounds is a recipient of the one carbon fragments that tetra hydro folate receives and transfers?

A
Serine

B
Formaldehyde

C
Glycine

D
Formimino glutamate (FIGLU)

Solution

Formaldehyde is a recipient of the one carbon fragments that tetra hydro folate receives and transfers
Question 7
1 / -0.25

On hydrolysis, proteins give:

A
Amides

B
Amino acids

C
Nucleotides

D
Nucleosides

Solution

The correct answer is option B
Ultimate product of hydrolysis of protein is amino acid. Proteins are polymers made up of several amino acids. These amino acids are linked through peptide bonds. On hydrolysis, peptide bonds are broken and amino acids are released.
Question 8
1 / -0.25

Deficiency of which vitamin causes scurvy?

A
Vitamin B₁

B
Vitamin B₁₂

C
Vitamin C

D
Vitamin A

Solution

Many people with scurvy, a disease caused by vitamin C deficiency, eventually die of infection due to their poorly functioning immune systems.
Question 9
1 / -0.25

When a protein is subjected to physical changes the protein loses its biological activity. This is known as:

A
Polypeptide

B
Depeptide

C
Renaturation

D
Denaturation

Solution

The correct answer is Option D
This loss of biological activity by the protein is called denaturation. During denaturation, the secondary and the tertiary structures of the protein get destroyed, but the primary structure remains unaltered. One of the examples of denaturation of proteins is the coagulation of egg white when an egg is boiled.
Question 10
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_________ are biocatalysts which speed up the reactions in biosystems.

A
Enzymes

B
Nucleic acid

C
Vitamins

D
Amino acids

Solution

The correct answer is Option A
Biocatalysis refers to the use of living (biological) systems or their parts to speed up (catalyze) chemical reactions. In biocatalytic processes, natural catalysts, such as enzymes, perform chemical transformations on organic compounds.

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Biomolecules Test - 8

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Biomolecules Test - 8

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Question 1

Polypeptides

Polysaccharides

Hydrocarbons

Polynitrogen heterocyclic compounds

Solution

Question 2

L-amino acids

D-amino acids

Peptide bond

Zwitter ion

Solution

Question 3

bone fragility

Fibrous Protein

weakness

all of these

Solution

Question 4

Hydrogen bond

Carbon bond

Polydiester bond

Peptide bond

Solution

Question 5

Calcidiol

Calcitriol

Cholecalciferol

Any of the above

Solution

Question 6

Serine

Formaldehyde

Glycine

Formimino glutamate (FIGLU)

Solution

Question 7

Amides

Amino acids

Nucleotides

Nucleosides

Solution

Question 8

Vitamin B1

Vitamin B12

Vitamin C

Vitamin A

Solution

Question 9

Polypeptide

Depeptide

Renaturation

Denaturation

Solution

Question 10

Enzymes

Nucleic acid

Vitamins

Amino acids

Solution

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Vitamin B₁

Vitamin B₁₂