The activation energy for a simple chemical reaction A → B is E a in forward direction. The activation energy for the reverse reaction is

Can be less than or more than E a

EASY

Earn 100

What is negative feedback inhibition?

Important Questions on Chemical Constituents of Living Cell

HARD

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

Which one of the following statements is incorrect?

HARD

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

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

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

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?

EASY

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

The enzyme bearing E.C

2.7.1.2

is:

MEDIUM

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

Ethanol is used to treat methanol toxicity because ethanol

EASY

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

Consider the following statements:

(A)

Coenzyme or metal ion that is tightly bound to enzyme protein is called prosthetic group.

(B)

A complete catalytic active enzyme with its bound prosthetic group is called apoenzyme.
Select the correct option.

HARD

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

The figure given below shows three velocity-substrate concentration curves for an enzyme reaction. What do the curves a, b, and c depict respectively?

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EASY

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

Enzymes are sensitive to

EASY

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

The activation energy for a simple chemical reaction

A \to B

E_{a}

in forward direction. The activation energy for the reverse reaction is

MEDIUM

Biology>Cell Structure and Function>Chemical Constituents of Living Cell>Enzymes

The given graph shows the effect of substrate concentration on the rate of reaction of the enzyme green gram-phosphatase. What does the graph indicate?

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