Ligases

Q. During conversion of succinyl Co–A to succinic acid a molecule of GTP is formed, that is known as:

1. Oxidative phosphorylation
2. Substrate level phosphorylation
3. Photophosphorylation
4. Terminal oxidation

Q.

Where does the Krebs cycle take place in the mitochondria?

Q.

Why TCA Cycle is amphibolic?

Q.

_________ catalyze covalent bonding between two molecules to form a large molecule.

1. Hydrolases

2. Transferases

3. Isomerases

4. Ligases

Q. Enzymes catalysing bonding of two components with the help of ATP are ___.

1. Transferases
2. Ligases
3. Phosphorylases
4. Lyases

Q. Substrate level phosphorylation occurs during

1. Succinic acid$\to$Fumaric acid
2. Fumaric acid$\to$Malic acid
3. Oxalosuccinic acid$\to \alpha -$ketoglutaric acid
4. Succinyl $CoA\to$Succinic acid

Q. Enzymes catalysing bonding of two components with the help of ATP are ___.

1. Transferases
2. Ligases
3. Lyases
4. Phosphorylases

Q. Differentiate between.
Lyases and ligases

Q.

The function of ligases is

1. Oxidation

2. Reduction

3. Synthesis by condensation

4. Group transfer reaction

Q. Enzyme capable of changing their shape are called as

1. Apoenzyme
2. Coenzyme
3. Allosteric enzyme
4. Co-factor

Q. Enzymes catalysing bonding of two components with the help of ATP are ___.

1. Transferases
2. Ligases
3. Lyases
4. Phosphorylases

Q.

Identify the correct set of enzymes by examining their action on substrates
I. $AH+B\to A+BH\left(NADH\right)$
II. Transfers functional group and includes 'Kinases'.
III. $A-B+H_{2}O\to A-OH+B-H$
IV. Breaks bonds without using water (formation of double bonds).
V. Conversion of compounds into its isomer $A-B\to B-A$

VI. Joins different compounds. $AB+C\to AB-C$

1. Lyases Isomerases Ligases Reductases Transferases

2. Isomerases Ligases Reductase Transferases Hydrolases

3. Transferases Hydrolases Lyases Lyases Ligases Reductases

4. Reductases Transferases Hydrolases Lyases Isomerases

Q. Assertion :Hydrolases are the enzymes which catalyse the hydrolysis of ester, ether, peptide, glycosidic, C-C or P-N etc. bonds. Reason: Lyases are the enzymes catalysing the linking together of 2 compounds like joining of C-O, C-N, P - O etc. bonds.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. _________ catalyse covalent bonding between two molecules to form a large molecule.

1. Hydrolases
2. Transferases
3. Isomerases
4. Ligases

Q. Anabolic reactions such as peptide synthesis are endergonic in nature.
This is generally the case because

1. The system releases heat and gains entropy.
2. The system absorbs heat and loses entropy.
3. The system absorbs heat and gains entropy.
4. The system releases heat and loses entropy.

Q. The number of substrate level phosphorylations in one turn of citric acid cycle is :

1. Three
2. Zero
3. One
4. Two

Q.

Identify the correct set of enzymes by examining their action on substrates
I. $AH+B\to A+BH\left(NADH\right)$
II. Transfers functional group and includes 'Kinases'.
III. $A-B+H_{2}O\to A-OH+B-H$
IV. Breaks bonds without using water (formation of double bonds).
V. Conversion of compounds into its isomer $A-B\to B-A$

VI. Joins different compounds. $AB+C\to AB-C$

1. I. Transferases II. Hydrolases III. Lyases IV. Isomerases V. Ligases VI. Reductases

2. I. Reductases II. Transferases III. Hydrolases IV. Lyases V. Isomerases VI. Ligases

3. I. Lyases II. Isomerases III. Ligases IV. Reductases V. Transferases VI. Hydrolases

4. I. Isomerases II. Ligases III. Reductases IV. Transferases V. Hydrolases VI. Lyases

Q. How many molecules of NAD+ is produced from NADH while conversion of DHAP to glycerol-3-phosphate?

1. 1
2. 2
3. 3
4. 4

Q. What will be the number of ATP and GTPs respectively, required in polymerisation of 13 amino acids in protein biosynthesis?

1. 26, 25
2. 13, 26
3. 14, 28
4. 13, 13

Q.

The function of ligases is

1. Synthesis by condensation

2. Group transfer reaction

3. Reduction

4. Oxidation

Q. _________ catalyse covalent bonding between two molecules to form a large molecule.

1. Isomerases
2. Ligases
3. Transferases
4. Hydrolases