Tag: classification of enzyme

Questions Related to classification of enzyme

Which of the following is not a co-enzyme?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. NAD

  2. NADP

  3. FAD

  4. ATP

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Correct Option: D
Explanation:

ATP or adenosine triphosphate is a nucleotide. It is not a co-enzyme.

Select the type of enzyme involved in the above reaction.

$\boxed{S - G + S' \rightarrow S + S' - G}$

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Dehydrogenase

  2. Transferase

  3. Hydrolase

  4. Lyase

  5. Isomerase

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Correct Option: B
Explanation:

Transferases are the enzymes that catalyze group transfer reactions. In the figure, one group G has been transferred to another group S'. It is a classical example of a group transfer reaction.

Who proposed the principle of "Induced fit"?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Jacob

  2. Fischer

  3. Koshland

  4. Laderberg

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Correct Option: C
Explanation:

The induced-fit model is proposed by Daniel Koshland in 1958. It is the most accepted model for enzyme-substrate complex. It describes the formation of the Enzyme substrate as a result of the interaction between the substrate and a flexible active site which means exposure of an enzyme to a substrate causes the active site of the enzyme to change shape in order to allow the enzyme and substrate to bind. Hence option C is correct.

NADP is

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. A coenzyme

  2. A part of tRNA

  3. An enzyme

  4. A part of rRNA

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Correct Option: A
Explanation:

Coenzymes are organic cofactors which are required for enzymatic action of certain enzymes. NADP is a coenzyme form of vitamin nicotinamide or niacin.

DNA polymerase enzyme is responsible for the synthesis of

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. DNA from RNA

  2. DNA from DNA

  3. RNA from DNA

  4. RNA from RNA

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Correct Option: B
Explanation:

DNA polymerase is an enzyme used in DNA replication. It synthesizes DNA on a DNA template. Bacteria have three different DNA polymerases, i.e., DNA pol I, DNA pol II and DNA pol III; while eukaryotes have several DNA polymerase enzymes.

Which of the following enzyme can form RNA from DNA?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Restriction enzyme

  2. DNA polymerase

  3. RNA polymerase

  4. Reverse transcriptase

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Correct Option: C
Explanation:

RNA polymerase participates in RNA synthesis during transcription process. It synthesizes RNA on DNA template.

Basically how many types of enzymes have been recognised by International Union of Biochemistry?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. 4

  2. 5

  3. 6

  4. 8

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Correct Option: C
Explanation:

According to the modern classification system given by International Union of Biochemistry, enzymes have been classified into six classes as follows :
Class First is Oxidoreductase.
Class Second is Transferase.
Class Third is Hydrolase.
Class Fourth is Lyase.
Class Fifth is Isomerase.
Class Sixth is Ligase.

Esterase enzyme belongs to which of the following class?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Oxidoreductase

  2. Carboxylase

  3. Hydrolases

  4. Transferases

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Correct Option: C
Explanation:

Esterases are the enzyme which hydrolyse ester linkage. Hence, esterases belong to class Hydrolase. Hydrolases are the enzymes catalysing hydrolysis.

Enzymes concerned with transfer of electrons are

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Hydrolase

  2. Dehydrogenase

  3. Transaminase

  4. Deoxygenase

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Correct Option: B
Explanation:

Dehydrogenases catalyze dehydrogenation reactions, which involve addition or removal of electrons. Addition or removal of electrons will lead to reduction or oxidation of substrates. Dehydrogenases are a type of oxidoreductases.

Which one of the following pair is wrongly matched?

biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

  1. Detergents - lipase

  2. Alcohol - nitrogenase

  3. Fruit juice - pectinase

  4. Textile - amylase

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Correct Option: B
Explanation:

This question relates to the industrial applications of enzymes. Alcohol is not produced by the use of nitrogenase. Nitrogenase performs complex functions of nitrogen fixation by bacteria. Alcohol is produced by the fermentation process of sugars carried out by Yeast.