Tag: the origin of cells and cell division

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

Enzymes catalysing removal of groups and formation of double bond are

  1. Transferases

  2. Ligases

  3. Lyases

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

Lyase is the enzyme by which the chemical bonds are broken down by the process other than hydrolysis and oxidation. It allows the formation of new bond. 

Ligase are the enzyme which catalyzes the joining of two large molecules by formation of chemical bonds.
Oxoreductase are the enzyme which catalyzes the oxidation and reduction reaction.

Transferase involves the transfer of functional group from one molecule to the other.
So, the correct answer is option C.

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

Enzymes which catalyse reactions involving changes in structure of a molecule are

  1. Ligases

  2. Isomerases

  3. Hydrolases

  4. Transferases
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Enzyme catalyzing optical or geometrical rearrangement of atomic groupings without altering molecular weight or number of atom is isomerase. It converts into from one isomer to the other isomer by changing the intramolecular arrangement by forming or breaking the bond. For, example glucose 6 phosphate is changed to fructose 6 phosphate by enzyme isomerase during the process of glycolysis.
Ligase is a enzyme which is used to join two molecules by establishing covalent bonds. Two DNA molecules are joined together by phosphodiester bond in presence of DNA ligase. The enzyme cannot be used for the blunt end of the DNA fragments. The nature of the bond is covalent as it involves the exchange of electrons.
Hydrolase are the enzyme which catalyses the splitting of compounds by addition of water.
Transferases helps to transfer functional group from one molecule to another.
So, the correct answer is option B.
Multiple choice biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

Class of enzymes contained in lysosome

  1. Lyases

  2. Ligases

  3. Hydrolases

  4. Transferases
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Lysosomes are formed by Golgi bodies. These are membrane-bounded vesicles which contain digestive and hydrolase enzymes like glycosidases, proteases, nucleases, phospholipases, and sulfatases. The enzymes are synthesized in the mRNA transcripts exit the nucleus into the cytosol, where they are translated by rough endoplasmic reticulum. The enzymes leave the Golgi apparatus as a vesicle known as lysosomes. 
So, the correct answer is option C.
Multiple choice biology enzymes classification of enzyme enzymes classification and cofactors the origin of cells and cell division

Name the type of enzyme involved in the following reaction $S-G+{S}^{'} \longrightarrow S-{S}^{'}+G$.

  1. Dehydrogenase

  2. Transferase

  3. Hydrolase

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

Transferase is an enzyme that transfers a specific functional groups from one molecule to another. 

Enzyme catalyzing optical or geometrical rearrangement of atomic groupings without altering molecular weight or number of atom is isomerase. It converts into from one isomer to the other isomer by changing the intramolecular arrangement by forming or breaking the bond. 
Dehydrogenase is an enzyme which participates in the oxidoreductase reaction by using a electron acceptor.
Hydrolase are the enzyme which catalyses the splitting of compounds by addition of water.
Lyase is the process by which the chemical bonds are broken down by the process other than hydrolysis and oxidation. It allows the formation of new bond. 
So, the correct answer is option B.

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

Arginosuccinase is a .............. enzyme.

  1. Hydrolase

  2. Ligase

  3. Lyase

  4. Oxido-reductase
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Hydrolase is a class of enzyme which act as biochemical catalysts that use water to break chemical bonds.

Ligase is an enzyme which catalyses the joining of two large molecules by forming a new bond generally accompanied by hydrolysis of a small chemical group.
Lyase is an enzyme which catalyses the breaking of C-C, C-O and C-N bonds by any methods other than hydrolysis or oxidation. Arginosuccinase is an enzyme which catalyses the breakdown of argininosuccinate producing arginine and fumarate.
Oxido-reductase is an enzyme which catalyses the transfer of electrons from the molecule of the reductant which acts as the electron donor to another molecule of the oxidant which accepts the electron.
So, the correct answer is 'Lyase'.

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

Enzyme involved in transfer of electrons belongs to 

  1. Hydrolase

  2. Desmolase

  3. Transaminase

  4. Dehydrogenase
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Dehydrogenase is an enzyme which participates in the oxidoreductase reaction by using an electron acceptor. It is involved in the transfer of electrons because it oxidizes a substrate by reducing it which means it transfers the electron from the substrate to an electron acceptor. Succinate dehydrogenase is an enzyme which is present in the inner mitochondrial membrane. It catalyzes the oxidation of succinate to fumarate.

So, the correct answer is option D.

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

Lactose metabolising enzyme, produced in the presence of lactose only is

  1. Inducible enzyme

  2. Repressible enzyme

  3. Regulatory enzyme

  4. Constitutive enzyme
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Inducible enzymes are synthesized only in the presence of their specific substrate, such as the enzymes of the lac operon in the presence of lactose.

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

Match List I with List II and select the correct answer.

List-I(Enzymes) List-II(Characteristic Activity)
a. Terminal transferees $1$. Stable above $90$ degrees C
b. Polynucleotide kinesis $2$. Cleave the ends of linear DNA
c. Taq DNA polymerases $3$ Adds phosphate to $5$ OH end of DNA or RNA
d. Exonucleases $4$. Adds a number of nucleotides to $3'$ end of DNA or RNA
$5$. Regulate the level of super coiling of DNA molecule
  1. A-$5$, B-$4$, C-$1$, D-$2$
  2. A-$4$, B-$3$, C-$1$, D-$2$
  3. A-$3$, B-$4$, C-$5$, D-$1$
  4. A-$4$, B-$3$, C-$2$, D-$1$
Reveal answer Fill a bubble to check yourself
A Correct answer