Tag: the origin of cells and cell division

Questions Related to the origin of cells and cell division

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.

Enzymes which act similarly are called as

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

  1. Isoenzyme

  2. Cofactor

  3. Coenzymes

  4. All of the above

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Correct Option: A
Explanation:

Isoenzymes are enzymes that catalyze identical chemical reactions but are composed of different amino acid sequences. They are sometimes referred to as isozymes. Isoenzymes are produced by different genes. They occur in many tissues throughout the body and are important for different developmental and metabolic processes. Alkaline phosphatase (ALP) and lactate dehydrogenase (LDH) are examples of isoenzymes.

Hexokinase (Glucose $+$ ATP $\longrightarrow$ Glucose 6-P $+$ ADP) belongs to the category

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

  1. Transferases

  2. Lysases

  3. Oxidoreductases

  4. Isomerases

Show answer
Correct Option: A
Explanation:

Transferase is an enzyme which transfers a group from one molecule to another molecule. Hexokinase is the enzyme which transfers one phosphate from ATP to glucose and forms glucose 6-phosphate.

(Glucose ++ ATP ⟶⟶ Glucose 6-P ++ ADP)
Thus, the correct answer is A.

Enzymes functional in cells are called

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

  1. Endoenzymes

  2. Exoenzymes

  3. Apoenzymes

  4. Isoenzymes

Show answer
Correct Option: A
Explanation:

Endoenzyme is the cells which function inside the cell. It is also known as intracellular enzymes. It helps in the catalysis of the intracellular metabolic reaction. 

Exoenzymes are the enzymes which function outside the cell.
Isoenzyme is also known as isozyme. When the two enzymes differ in amino acid sequence but catalyze the same chemical reaction they are known as isoenzyme. They are two different molecular form of the enzyme.
Enzymes are proteins which help to catalyze the biochemical reaction. The enzyme has a protein part which is not active is known as apoenzyme.
So, the correct answer is option A.