During ammonium assimilation, requires two enzymes converting ammonium to amino acids. Each of which is Glutamine synthetase (GS), given below some statements about GS ;

a) GS transfers the amide group of glutamine to 2-oxoglutarate, yielding two molecules of glutamate

b) it requires a divalent cation such as Mg2+, Mn2+, or Co2+ as a cofactor

c) Plants contain two classes of GS, one in the cytosol and the other in root plastids or shoot chloroplasts

d) The cytosolic forms are expressed in germinating seeds or in the vascular bundles of roots and shoots and produce glutamate for intercellular nitrogen transport

e) The GS in root plastids generates amide nitrogen for local consumption; the GS in shoot chloroplasts reassimilates photorespiratory NH4+

f) Light and carbohydrate levels alter the expression of the cytosolic forms of the enzyme, but they have little effect on the plastid forms.

Which of the following statements is correct?

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#Question id: 33238

#Unit 1. Molecules and their Interaction Relevant to Biology

In case of enzymes, Fe²⁺, Fe³+, Cu²⁺, Mn²⁺, or Co²⁺

TLS Online TPP Program

#Question id: 33239

#Unit 1. Molecules and their Interaction Relevant to Biology

In case of enzymes, Mg²⁺ and Zn²⁺

TLS Online TPP Program

#Question id: 33240

#Unit 1. Molecules and their Interaction Relevant to Biology

Metal ions participate in the catalytic process

A. By binding to substrates to orient them properly for reaction.

B. By mediating oxidation–reduction reactions through reversible changes in the metal ion’s oxidation state.

C. By electrostatically stabilizing or shielding negative charges.

Which is/are correct statement

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#Question id: 33241

#Unit 1. Molecules and their Interaction Relevant to Biology

Carbonic anhydrase contains an essential Zn²⁺ ion which is involved in

TLS Online TPP Program

#Question id: 33242

#Unit 1. Molecules and their Interaction Relevant to Biology

Reactants must come together with the proper spatial relationship for a reaction to occur in the active site of enzymes called as

TLS Online TPP Program

#Question id: 33243

#Unit 1. Molecules and their Interaction Relevant to Biology

Enzyme’s proximity and orientation effects alone can enhance reaction rates by