Biomolecules Test

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Biomolecules Test - 27

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Question 1
1 / -0

Number of known enzymes is

A
$$500$$

B
$$1000$$

C
$$1500$$

D
Over $$2000$$

Solution

Anselme Payen was the first to discover an enzyme, diastase, in 1833. Enzymes are proteins which helps to catalyze the biochemical reaction. The enzyme has a protein part which is not active is known as apoenzyme. It gets activated on addition of an organic or inorganic cofactor. Holoenzyme is defined as apoenzyme in combination with the cofactor. The part of enzyme where substrate molecules gets attached is known as active site. Over 2000 enzymes are known.
So, the correct answer is option D.
Question 2
1 / -0

A plant proteinase is

A
Papain

B
Trypsin

C
Pepsin

D
Urease

Solution

Papain is also known as papaya proteinase I. It is found in papaya. It breaks the peptide bond of the proteins. It also hydrolyzes esters and amides.
Trypsinogen is activated by enteropeptidase to trypsin which helps in the digestion of protein in the small intestine.
Pepsin is an enzyme that breaks down proteins into smaller peptides.
Urease hydrolyzes urea to ammonia and carbon dioxide. All three enzymes are present in animals.
So, the correct answer is option A.
Question 3
1 / -0

Repressible enzyme is

A
Present all the time

B
Functional almost all the time

C
Repressed in presence of a specific chemical

D
All the above

Solution

The repressible enzyme is an enzyme which remains active all the time, usually, function in anabolic pathways. If the end product is present in sufficient amount or the level of the substrate is high, then the pathways turn off. Thus, the correct option is D.
Question 4
1 / -0

Iodine stains

A
Pectin

B
Lignified regions

C
Cellulose

D
Starch.

Solution

Iodine is used in chemistry as an indicator for starch. When starch is mixed with iodine in solution, an intensely dark blue colour develops, representing a starch/iodine complex. Starch is a substance common to most plant cells and so a weak iodine solution will stain starch present in the cells. Iodine is one component in the staining technique known as Gram staining, used in microbiology.
So, the correct answer is 'Starch.'
Question 5
1 / -0

The enzyme purified and crystallised for the first time was

A
Urease

B
Insulin

C
Diastase

D
Zymase

Solution

Enzymes are the proteins which catalyze a biochemical interaction. It was crystallized by Sumner. They were found in yeast extract by Buchner in 1897. He prepared a yeast extract and added sugar solution to it. After some time he noticed the alcohol formation in the extract which was a sign of fermentation which took in presence of enzyme. Later on, Sumner crystallized an enzyme known as urease and reported that all enzymes are protein. Urease catalyzes the hydrolysis of urea into carbon dioxide and ammonia.
So, the correct answer is option A.
Question 6
1 / -0

A non-proteinaceous enzyme is

A
Lysozyme

B
Ribozyme

C
Ribonuclease-P

D
Both B and C

Solution

Ribozymes are also known as ribonucleic acid enzymes. These are RNA molecules which helps in the catalysis of a particular reaction. It was discovered in the year 1982. The RNA can act as both genetic material and can act as a biocatalyst. It acts as a part of ribosome which attaches to the amino acid during protein synthesis. Thomas R. Cech and Sidney Altman discovered catalytic properties of RNA.
Ribonuclease-P cleaves RNA. It is an essential tRNA processing enzyme. It requires magnesium ions for the catalysis.
So, the correct answer is option D.
Question 7
1 / -0

Which of the following statements is not correct?

A
All enzymes are biocatalysts.

B
All proteins are enzymes.

C
All enzymes are thermolabile.

D
All the statements are incorrect.

Solution

All proteins are not essentially enzymes. There are many signaling molecules and transcription factor which do not catalyze any reaction (hence not enzymes) but are proteins. Similarly, all enzymes are also not proteins, like ribozymes. For example, in ribosome, there are many RNA molecules which catalyze certain steps in translation. Also, RNA splicing is a reaction which is catalyzed by RNA themselves. So, even though most enzymes are protein in nature, there are exceptions. However, it is not entirely correct to say that all enzymes are thermolabile. Many RNases are extremely resistant to heat denaturation. Many proteins of extremophiles (thermophilic bacteria; Bacillus stearothermophilus) are quite resistant to high temperatures and have evolved to maintain their catalytic activity in higher temperatures where the organisms thrive. So, the correct answer is 'All proteins are enzymes'.
Question 8
1 / -0

An enzyme made of both protein and non-protein parts is together called

A
Coenzyme

B
Endoenzyme

C
Exoenzyme

D
Holoenzyme

Solution

Enzymes are proteins which help to catalyze the biochemical reaction. The enzyme has a protein part which is not active is known as apoenzyme. It gets activated by the addition of an organic or inorganic cofactor. The holoenzyme is defined as apoenzyme in combination with the cofactor.
So, the correct answer is option D.
Question 9
1 / -0

The protein part of enzyme is

A
Prosthetic group

B
Apoenzyme

C
Holoenzyme

D
Zymogen

Solution

Enzymes are proteins which help to catalyze the biochemical reaction. The enzyme has a protein part which is not active is known as apoenzyme. It gets activated by the addition of an organic or inorganic cofactor. The holoenzyme is defined as apoenzyme in combination with the cofactor.
The cofactor is a nonprotein part of the enzyme. It can be metal ions or the organic chemical. The cofactors which are organic chemicals are known as the coenzyme. These are loosely attached to the apoenzyme. The tightly bound coenzymes are the prosthetic group.
So, the correct answer is option B.
Question 10
1 / -0

Which of the following vitamins is water soluble?

A
Vitamin E

B
Vitamin D

C
Riboflavin

D
Retinol

Solution

Riboflavin is vitamin $${B}_{2}$$ which is the only water-soluble vitamin used as a food coloring known as riboflavin.

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Re-Attempt Weekly Quiz Competition

Biomolecules Test - 27

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Biomolecules Test - 27

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SHARING IS CARING

Question 1

$$500$$

$$1000$$

$$1500$$

Over $$2000$$

Solution

Question 2

Papain

Trypsin

Pepsin

Urease

Solution

Question 3

Present all the time

Functional almost all the time

Repressed in presence of a specific chemical

All the above

Solution

Question 4

Pectin

Lignified regions

Cellulose

Starch.

Solution

Question 5

Urease

Insulin

Diastase

Zymase

Solution

Question 6

Lysozyme

Ribozyme

Ribonuclease-P

Both B and C

Solution

Question 7

All enzymes are biocatalysts.

All proteins are enzymes.

All enzymes are thermolabile.

All the statements are incorrect.

Solution

Question 8

Coenzyme

Endoenzyme

Exoenzyme

Holoenzyme

Solution

Question 9

Prosthetic group

Apoenzyme

Holoenzyme

Zymogen

Solution

Question 10

Vitamin E

Vitamin D

Riboflavin

Retinol

Solution

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