8 + Interview Questions in ENZYMES IN GENERAL AWARENESS Page 1 InterviewSolution

1.	Which enzyme was obtained in a crystalline form first of all? (a) Urease (b) Catalase (c) Amylase (d) Aldolase
Answer» The answer is (a) Urease It plays an essential function for survival, neutralizing gastric acid by allowing urea to enter into periplasm via a proton-gated urea channel. The presence of urease is used in the diagnosis of Helicobacter species.

1.

Which enzyme was obtained in a crystalline form first of all? (a) Urease (b) Catalase (c) Amylase (d) Aldolase

Answer»

The answer is (a) Urease

It plays an essential function for survival, neutralizing gastric acid by allowing urea to enter into periplasm via a proton-gated urea channel. The presence of urease is used in the diagnosis of Helicobacter species.

Discussion

2.	The protein part and non-protein part of holoenzyme are called as
Answer» Protein part is named as apoenzyme and the non-protein part is called as co-factor.

Discussion

3.	Who proposed lock and key theory and when was it proposed
Answer» Emil Hermann Fischer, more commonly known as Emil Fischer, was an eminent German organic chemist. He received the 1902 Nobel Prize for Chemistry for his influential research regarding purines and sugars.

Discussion

4.	Which enzyme was discovered first of all? (a) Zymase (b) Lipase (c) Pepsin (d) Isomerase
Answer» The answer is (a) Zymase An enzyme or enzyme complex of yeast that promotes fermentation of sugar.

4.

Which enzyme was discovered first of all? (a) Zymase (b) Lipase (c) Pepsin (d) Isomerase

Answer»

The answer is (a) Zymase

An enzyme or enzyme complex of yeast that promotes fermentation of sugar.

Discussion

5.	Enzyme activity is affected by – (a) pH only (b) Substrate concentration (c) only temperature (d) All the above
Answer» The answer is (d) All the above

Discussion

6.	Which of the following statement is absolutely correct? (a) All proteins are enzymes (b) All enzymes are proteins (c) Most enzymes are proteins (d) None of the above
Answer» The answer is (c) Most enzymes are proteins

Discussion

7.	Briefly explain the method of nomenclature of enzymes.
Answer» There are several methods of naming enzymes. These are as follows: Most enzymes are named by adding suffix-case at the end of the name of substrate catalyzed by them. Example: Maltase, Sucrase, Urease. Many enzymes are named on the basis of the type of catalytic reaction governed by the enzyme. Example: Oxidase, Dehydrogenase etc. In the modern method of nomenclature, enzymes are named by adding suffix-case after both the name of the substrate on which they act and the type of catalytic reaction governed by them. Example: Succinate dehydrogenase. In some cases, traditional names of enzymes have been retained and are in practice. Example: Pepsin, Trypsin, Chymotrypsin. International Union of biochemistry has proposed systematic nomenclature in which some code number is given to each enzyme. In this nomenclature, substrate name, type of reaction catalyzed and some other information is also included.

7.

Briefly explain the method of nomenclature of enzymes.

Answer»

There are several methods of naming enzymes.

These are as follows:

Most enzymes are named by adding suffix-case at the end of the name of substrate catalyzed by them. Example: Maltase, Sucrase, Urease.
Many enzymes are named on the basis of the type of catalytic reaction governed by the enzyme. Example: Oxidase, Dehydrogenase etc.
In the modern method of nomenclature, enzymes are named by adding suffix-case after both the name of the substrate on which they act and the type of catalytic reaction governed by them. Example: Succinate dehydrogenase.
In some cases, traditional names of enzymes have been retained and are in practice. Example: Pepsin, Trypsin, Chymotrypsin.
International Union of biochemistry has proposed systematic nomenclature in which some code number is given to each enzyme. In this nomenclature, substrate name, type of reaction catalyzed and some other information is also included.

Discussion

8.	In what respect enzymes are different from catalysts? (a) High diffusion rate (b) Active at high temperature (c) Protein nature (d) Used in the reaction
Answer» The answer is (c) Protein nature

Discussion

Explore topic-wise InterviewSolutions in .

Which enzyme was obtained in a crystalline form first of all? (a) Urease (b) Catalase (c) Amylase (d) Aldolase

The protein part and non-protein part of holoenzyme are called as

Who proposed lock and key theory and when was it proposed

Which enzyme was discovered first of all? (a) Zymase (b) Lipase (c) Pepsin (d) Isomerase

Enzyme activity is affected by – (a) pH only (b) Substrate concentration (c) only temperature (d) All the above

Which of the following statement is absolutely correct? (a) All proteins are enzymes (b) All enzymes are proteins (c) Most enzymes are proteins (d) None of the above

Briefly explain the method of nomenclature of enzymes.

In what respect enzymes are different from catalysts? (a) High diffusion rate (b) Active at high temperature (c) Protein nature (d) Used in the reaction