Which of the following is amylose (and NOT amylopectin)?

Question

BlackTom AI · Accepted Answer

To tackle the question, I’ll compare each option to what defines amylose versus amylopectin. 
Option 1: 'Rapidly digested'—This is not accurate for amylose. Amylose is a linear polymer of glucose linked by α(1→4) bonds, which tends to form a helical structure and is digested more slowly than amylopectin, which has many branch points that increase accessibility to enzymes. So this statement mischaracterizes amylose’s digestion speed.

Option 2: 'A polymer of glucose with branch points'—That description fits amylopectin, not amylose. Amylopectin has α(1→6) branches roughly every 24–30 glucose units, whereas amylose lacks these branch points entirely. Therefore this option incorrectly identifies amylose.

Option 3: 'Not just glucose'—This is factually incorrect for amylose. Amylose is a polymer consisting solely of glucose units connected by α(1→4) bonds; there are no other carbohydrate components within the chain itself. Thus this option falsely broadens what amylose is.

Option 4: 'Fermentation in the lower bowel (flatulence)'—This statement aligns more with starches that escape complete digestion in the small intestine and are fermented by colonic bacteria, producing gas. Amylose, being a less-branched, more resistant fraction of starch, tends to be fermented to some extent in the colon, which can contribute to flatulence. While fermentation can occur with various starches, this option best captures a differentiating feature relative to amylopectin’s digestion profile, and it is the only choice that plausibly describes a property associated with amylose.

In summary, the first three options misstate structural or chemical aspects of amylose (its branching, its composition, and its digestion rate). The fourth option correctly points to a physiological outcome (fermentation/flatulence) that is associated with less readily digestible starch components such as amylose in practical terms, making it the best match among the given choices.

Which of the following is amylose (and NOT amylopectin)?单项选择题

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