Tag: enzymes

Quizzes (4) Questions (199)

Questions Related to enzymes

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

DNA polymerase enzyme is responsible for the synthesis of

  1. DNA from RNA

  2. DNA from DNA

  3. RNA from DNA

  4. RNA from RNA
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

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

  1. 4

  2. 5

  3. 6

  4. 8
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

Enzymes concerned with transfer of electrons are

  1. Hydrolase

  2. Dehydrogenase

  3. Transaminase

  4. Deoxygenase
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which one of the following pair is wrongly matched?

  1. Detergents - lipase

  2. Alcohol - nitrogenase

  3. Fruit juice - pectinase

  4. Textile - amylase
Reveal answer Fill a bubble to check yourself
B Correct answer
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.

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

Which one is not an example for hydrolases?

  1. Dehydrogenase

  2. Protease

  3. Amylase

  4. Esterase

  5. Sucrase
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

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

  1. Requiring energy

  2. Releasing energy

  3. Being enzymatic

  4. Being spontaneous
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Biochemical reactions are unique because they are mediated by enzymes, which lower activation energy and increase reaction rates under physiological conditions.

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

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

  1. Apoenzyme

  2. Antienzyme

  3. Isoenzyme

  4. Coenzyme
Reveal answer Fill a bubble to check yourself
C Correct answer
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.