• Cation Exchangers in Chromatography:
• Cation-exchange resins possess negatively charged functional groups that attract and bind positively charged molecules (cations):
• Carboxy-Cellulose and (D) Carboxymethyl-Cellulose (CM-cellulose): Weak cation exchangers bearing carboxylate groups ($-\text{O}-\text{CH}_2-\text{COO}^-$).
• Sulfopropyl (SP) / Methyl sulfonate (S): Strong cation exchangers ($-\text{SO}_3^-$).
• Anion Exchangers: Possess positively charged groups that bind anions:
• DEAE-Sepharose: Diethylaminoethyl, a weak anion exchanger ($-\text{CH}_2\text{CH}_2\text{N}^+\text{H}(\text{CH}_2\text{CH}_3)_2$).
• Q-Sepharose: Quaternary ammonium, a strong anion exchanger ($-\text{CH}_2\text{N}^+(\text{CH}_3)_3$).
• Conclusion: Resins (C) and (D) only are cation exchangers.

Correct option: (4) (C) and (D) only.

• Phase II Detoxification Reactions of Xenobiotics:
• Phase II reactions are conjugation reactions that attach an endogenous hydrophilic molecule to a functional group created in Phase I, forming water-soluble conjugates for excretion:
• Methylation: Catalyzed by methyltransferases using $S$-adenosylmethionine (SAM).
• Amino Acid Conjugation: Conjugation with glycine or glutamine (e.g., benzoic acid to hippuric acid).
• Glutathione Conjugation: Catalyzed by glutathione $S$-transferases (GSTs) utilizing reduced glutathione (GSH), ultimately excreted as mercapturic acids.
• Hydroxylation: A Phase I functionalization reaction catalyzed primarily by Cytochrome P450 monooxygenases.
• Conclusion: Reactions (A), (B) and (C) only are Phase II reactions.

Correct option: (1) (A), (B) and (C) only.

Matching the items of List I with List II for Vitamins and other biochemical constituents with special reference to disease diagnosis in domestic animals:

The correct combination is Option 1: (A)- (1), (B)- (I), (C) - (ll), (D) - (IV).

Correct option: (1) (A)- (1), (B)- (I), (C) - (ll), (D) - (IV)