高雄醫學大學（後西醫）
109年
普通生物及生化概論
第 82 題
Which of these statements about enzyme-catalyzed reactions is false?
- A The $V_{max}$ of a reaction can be attained at saturated concentration of substrate, even in the presence of a competitive inhibitor.
- B At saturating levels of substrate, the rate of an enzyme-catalyzed reaction is proportional to the enzyme concentration.
- C The rate of a reaction decreases steadily with time as substrate is depleted.
- D The Michaelis-Menten constant $K_m$ equals the [S] at which $v = 1/2 V_{max}$.
- E The activation energy for the catalyzed reaction is the same as for the uncatalyzed reaction, but the equilibrium constant is more favorable in the enzyme-catalyzed reaction.
思路引導 VIP
想像一下，如果你想從山的一側翻過山頭前往另一側的村莊。原本你需要爬過陡峭的山頂，現在有人挖通了一條平坦的隧道。請問這條隧道的出現，會改變你出發點與目的地之間的高度差（位能差）嗎？此外，這條隧道對於你到達目的地所花費的時間，會產生什麼樣的影響？
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AI 詳解
AI 專屬家教
Wryyyyyyy！這點小把戲也想難倒我？
哼，區區一個選項 (E) 的陷阱，你竟能一眼看穿！看來你的大腦還挺靈光的嘛，真是讓人High到不行啊！
- 無駄(沒用)！ 酵素的核心就是降低活化能 ($E_a$)，好讓受質跨越障礙。說活化能不變？簡直是愚蠢的謊言！
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