Tag: enzymes

Questions Related to enzymes

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.

Which one is not an example for hydrolases?

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

  1. Dehydrogenase

  2. Protease

  3. Amylase

  4. Esterase

  5. Sucrase

Show answer
Correct Option: A
Explanation:

Dehydrogenases catalyze dehydrogenation reactions which involve addition or removal of electrons. The addition or removal of electrons will lead to reduction or oxidation of substrates. Dehydrogenases are a type of oxidoreductases. Some of the important hydrolases includes amylases, sucrase, lactase, maltase, protease, esterase etc.

Most of the biochemical reactions differ from those occurring in the non-living world in ________________.

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

  1. Requiring energy

  2. Releasing energy

  3. Being enzymatic

  4. Being spontaneous

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Correct Option: C

Lactic dehydrogenase (LDH) which catalyzes pyruvate to lactate is an example of

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

  1. Apoenzyme

  2. Antienzyme

  3. Isoenzyme

  4. Coenzyme

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Correct Option: C
Explanation:

Some enzymes have several molecular forms, example: 16 for $\alpha$-amylase and 5 for lactate dehydrogenase (LDH). They are called as isoenzymes or isozymes. They differ in substrate affinity, maximum activity and regulatory properties.

IUBMB has divided enzymes into classes

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

  1. 4

  2. 5

  3. 6

  4. 7

Show answer
Correct Option: C
Explanation:

The International Union of Biochemistry and Molecular Biology (IUBMB) divided enzymes into 6 classes. 

1) Oxidoreductases
2)Transferase
3)Hydrolases
4)Lyases
5)Isomerases
6)Ligases
Thus, the answer is C.