单项选择题

According to the passage, which of the following statements is true of Amadori products in proteins

A．They are created through enzymatic glycosylation.
B．They are composed entirely of glucose molecules.
C．They are derived from Schiff bases.
D．They are derived from AGE's.
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单项选择题
According to the passage, which of the following is characteristic of enzymatic glycosylation of proteins
A．AGE's are formed after a period of months or years.
B．Proteins affected by the process are made unstable.
C．Glucose attachment impairs and stiffens tissues.
D．Glucose is attached to proteins for specific purposes.
单项选择题
If the hypothesis stated at the end of the passage is true, it can be inferred that the crystallin proteins in the lenses of people with cataracts _______.
A．have increased elasticity
B．do not respond to enzymatic glycosylation
C．are at least several months old
D．respond more acutely than other proteins to changes in moisture levels
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