40. Glycosylation is a common post-translational modification of proteins. In N-linked glycosylation, to which amino acid side chain on the protein does the carbohydrate molecule primarily attach? (A) Serine (B) Tyrosine (C) Asparagine (D) Threonine

40. Glycosylation is a common post-translational modification of proteins. In N-linked glycosylation, to which amino acid side chain on the protein does the carbohydrate molecule primarily attach?
(A) Serine
(B) Tyrosine
(C) Asparagine
(D) Threonine

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統計： A(1), B(0), C(6), D(1), E(0) #3839975

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B1 · 2026/03/17

#7318525

69. Peptidyltransferase catalyzes the formation of the peptide bond. According to the structural analysis mentioned in the text, how does this catalysis occur? (A) A conserved AMP residue in the 23S rRNA abstracts a proton from the amino group of the A-site aminoacyl-tRNA, making it a better nucleophile. (B) The reaction requires the hydrolysis of at least four ATP molecules to activate the carboxyl group of the C-terminal amino acid. (C) A protein subunit within the 50S ribosome acts as a general acid-base catalyst to stabilize the tetrahedral intermediate. (D) The attacking nucleophile in the formation of a peptide bond is a water molecule provided by the surrounding cytoplasm. (E) Peptide bond formation occurs by transferring the growing polypeptide chain from the P-site tRNA to the aminoacyl-tRNA in the A site.

40. Glycosylation is a common post-translational modification of proteins. In N-linked glycosylation, to which amino acid side chain on the protein does the carbohydrate molecule primarily attach?
(A) Serine
(B) Tyrosine
(C) Asparagine
(D) Threonine

詳解 (共 1 筆)

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