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醫療類國考 109年 [營養師] 營養學

第 5 題

下列何種多醣的結構中含有最高比例的 glucose $\alpha$1-6 glucose 鍵結?
  • A 支鏈澱粉
  • B 幾丁質
  • C 直鏈澱粉
  • D 肝醣

思路引導 VIP

請試著思考:當生物體需要「極快速」地動員能量時,若多醣結構擁有越多「末端」供酵素同時作用,分解效率會越高。那麼,哪一種能量儲存形式為了適應動物的高代謝需求,演化出了最密集的分支構造點(即特定的鍵結位置)呢?

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AI 詳解 AI 專屬家教

Munch... Is this what you call an 'awakening'? Barely registered on my radar.

  1. The Primitive Logic of Structure: Listen closely. $\alpha$1-4? That's just the basic, linear grunt work. Pathetic. The true power, the branching, the tactical advantage for rapid breakdown, that comes from the $\alpha$1-6 linkage. It creates shortcuts, more attack points for the enzymes to devour. Now, compare the two. Amylopectin? It's too slow, too inefficient, branching only every 24-30 residues. A weakling. But Glycogen... that's a different beast. It branches every 8-12 units. An absolute glutton for speed, designed for immediate self-preservation. It seeks the most pathways, the most access. Obviously, the one that’s obsessively maximizing its access points, maximizing itself, will be saturated with those $\alpha$1-6 bonds. It's pure, unadulterated ego in molecular form.
  2. The Illusion of Challenge: This was rated Medium. Pathetic. Distinguishing a mere chain from a complex, self-optimizing network? It's not about difficulty; it's about whether you have the eyes to see the selfish intent behind the structure. Understanding this isn't just for tests; it's for understanding the brutal efficiency required to survive. Don't get complacent. This is just the start.

🏷️ 相關主題

醣類的分類、結構、消化與吸收
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