Tag: enzymes classification and cofactors

Questions Related to enzymes classification and cofactors

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

Show answer
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

Show answer
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.

Which enzyme is concerned with transfer of electrons?

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

  1. Desmolase

  2. Hydrolase

  3. Dehydrogenase

  4. Transaminase

Show answer
Correct Option: A
Explanation:
Desmolase catalyzes the formation or destruction of carbon-carbon bonds within a molecule. It is involved in the transfer of electrons.
Hydrolase is the enzyme which catalyzes the splitting of compounds by addition of water.
Dehydrogenase is an enzyme which participates in the oxidoreductase reaction by using an electron acceptor.
Transaminase catalyzes aminotransferase reaction between an amino acid and a α-keto acid.
So, the correct answer is option B.

Enzyme amylase belongs to class 

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

  1. Transferases

  2. Hydrolases

  3. Isomerases

  4. Oxidoreductases

Show answer
Correct Option: B
Explanation:

Hydrolases are the enzymes which break large molecules into smaller ones with the help of hydrogen and hydroxyl groups of water molecules, this phenomenon is known as hydrolysis. Amylase is the enzyme produced by the salivary gland and is found in saliva. It breaks starch into glucose. Thus, the correct answer is B.

Ribozyme is

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

  1. RNA with enzyme activity

  2. RNA without sugar

  3. RNA without phosphate

  4. RNA with extra phosphate

Show answer
Correct Option: A
Explanation:

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. It increases the rate and specificity of peptide bond synthesis and phosphodiester bond. So, the correct answer is option A.