N-linked oligosaccharides on secreted glycoproteins are attached to
(a) nitrogen atoms in the polypeptide backbone.
(b) the serine or threonine in the sequence Asn-X-Ser/Thr.
(c) the N-terminus of the protein.
(d) the asparagine in the sequence Asn-X-Ser/Thr.
Answer:

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