MEDIUM
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Following are the steps of the catalytic cycle of enzyme action:-
i. Enzyme releases the product and is ready to bind to another molecule of the substrate.
ii. Binding of the substrate induces the enzyme to alter its shape, fitting more tightly around the substrate.
iii. The active site of the enzyme, now in close proximity of the substrate, breaks the chemical bonds of the substrate.
iv. The substrate bind to the active site of the enzyme.

Choose the correct sequence of the steps from the following.

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Important Questions on Enzymes

HARD
Explain lock and key theory of enzyme action and draw a labelled diagram of a model.
MEDIUM
What is enzyme? Write the name of two enzymes?
HARD
Explain the mode of enzyme action on the basis of lowering of activation energy. Draw a labelled diagram to show activation energy.
EASY
Which of the following is not a function of the skeletal system?
MEDIUM
Which of the following describes the given graph

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HARD
Which type of tissue is correctly paired with its location?
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 _____
HARD
Given below are the four schematics that describe the dependence of the rate of an enzymatic reaction on temperature. Which of the following combination is true for thermophilic and psychrophilic organisms?

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MEDIUM
Ribozymes are:
A) Catalytic RNA
B) Non-Protein enzymes
C) Nucleic acids
D) Group of ribosomes
EASY

Identify the labelled parts 1, 2, 3, 4 in the concept of activation energy shown in the below diagram?

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EASY
The function of the gap junction is to:
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

EASY
Which of the following statements is true about glandular epithelium in the salivary gland?
HARD
It is much easier for a small animal to run uphill than for a large animal, because:
MEDIUM
Epithelial cells in animals are held by specialized junctions, one of them being "Gap junction". Function of a "Gap junction" is to
EASY
Part of epidermis that keeps out unwanted particles is called:
MEDIUM
A person has 400 million alveoli per lung with an average radius of 0.1 mm for each alveolus. Considering the alveoli are spherical in shape, the total respiratory surface of that person is closest to
EASY

Match the following?

Enzymes Functions
(a) Lyases (i) Oxido reduction
(b) Isomerases (ii) Link compounds
(c) Dehydrogenases (iii) Transfer of group
(d) Ligases (iv) Interconversion
    (v) Removal of groups

 

EASY
When RNAse enzyme is denatured by adding urea, which ONE of the following combinations of bonds would be disrupted?
MEDIUM
Select the option which is not correct with respect to enzyme action: