EASY
Earn 100

Mention the functions of dehydrogenase.

Important Questions on Biomolecules

HARD

Study the following

(I) Km value Affinity of the enzyme Inverse measure enzyme affinity
(II) Hydrolases P-O bonds Linking 2 compounds
(III) Transferases Transfer of a group Inhibitor of reaction
(IV) Emil Fisher Lock and key hypothesis Formation of ES complex

The correct combinations are

MEDIUM
Which of the following describes the given graph

Question Image
HARD

Find out where transketolase and epimerase reactions occur among the following:

i) G-3-P+DHAP Fructose -1-6- bisphosphate

ii) Sedoheptulose- 7- Phosphate +G-3-P Xylulose -5-P+ Ribose -5- Phosphate

iii) Ribose -5- Phosphate Ribulose -5- Phosphate

iv) Xylulose -5 -Phosphate  Ribulose-5 - Phosphate

v) Fructose - 6 -Phosphate +G-3-P Xylulose- 5 -Phosphate + Erythrose -4-Phosphate

The correct combination is

MEDIUM
Solid and dotted lines represent the activities of pepsin and salivary amylase enzymes of the digestive tract, respectively. Which one of the following graphs best represents their activity vs pH?
MEDIUM
Match the enzymes in Group I with the reaction in Group II. Select the correct combination.

Group I Group II
P. Hydrolase i. Inter-conversion of optical isomers
Q. Lyase ii. Oxidation and reduction of two substrates
R. Isomerase iii. Joining of two compounds
S. Ligase iv. Removal of a chemical group from one substrate
v. Transfer of a chemical group from one substrate to another
MEDIUM
Ethanol is used to treat methanol toxicity because ethanol
EASY
The enzyme bearing E.C 2.7.1.2 is:
EASY
Write class of enzyme which catalyses the oxidation and reduction reactions.
MEDIUM

Match the enzymes in Column I with their respective biochemical reactions in column II. Choose the correct combination from below

Column I Column II
(P) Transaminases (i) Removal of a phosphoryl group from a specific amino acid
(Q) Protein Kinases (ii) Removal of α-amino group from a specific amino acid
(R) Protein Phosphatases (iii) Addition of phosphoryl group to a specific amino acid
(S) Dehydrogenases (iv) Interconversion of optical isomers
  (v) Oxidation and reduction of substrates
MEDIUM
Explain the nomenclature of enzymes on the basis of chemical reactions.
HARD

The following graph shows the concentration of substrate on enzyme activity:

Question Image

What does the Y-axis represent?

EASY
Which one of the following statements is correct, with reference to enzymes?
EASY
Bottled fruit juices brought from the market are clearer as compared to those made at home because the bottled juices are clarified by the use of _____
EASY
Serine proteases are called so because they
HARD
Explain the mode of enzyme action on the basis of lowering of activation energy. Draw a labelled diagram to show activation energy.
MEDIUM
What is enzyme? Write the name of two enzymes?
HARD
Explain lock and key theory of enzyme action and draw a labelled diagram of a model.
HARD
Which one of the following statements is incorrect?
MEDIUM
Select the option which is not correct with respect to enzyme action: