Which of the following support/carrier is not used in the covalent bonding method?

Which of the following support/carrier is not used in the covalent bonding method? Correct Answer Carbonyl groups

Carbonyl groups are not used as a support/matrix in the covalent bonding method of immobilization. Phenol ring of tyrosine, the Hydroxyl group of serine, Thiol group of cysteine, etc. are used as a matrix for covalent bonding.

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