請問一題生物問題? - 考試

想請問一題生物問題,在沈老大第一本課本page-397

A young animal has never had much energy.He is brought to a veterinarian

for help and is sent to the animal hospital for some tests. There they

discover his mitochondria can use only fatty acids and amino acids for

respiration,and his cell produce more lactate than normal.Of the following,

which is the best explanation of his condition?

(A)His mitochondria lack the transport protein that moves pyruvate across

the outer mitochondria membrane.

(B)His cells cannot move NADH from glycolysis into the mitochondria.

(C)His cells contain something that inhibits oxygen use in his mitochondria.

(D)His cells lack the enzyme in glycolysis that forms pyruvate.

答案給的是A

但是我覺得,

(1)transport protein 不是在 m.t 的內膜嗎? 外膜的通透性很好,那A為何對?

(2)B,C不用考慮了.

(3)D 我覺得是對的, 雖然葡萄糖的糖解反應無法形成 pyruvate, fatty acid 可以由

acetyl-CoA 進入細胞呼吸的citric acid cycle,但是protein--> a.a -->是有三

個pathway進入有氧呼吸,其中一個pathway不就是a.a ----...-->pyruvate


有沒有高人可以幫忙解釋一下,老師為何說A是對的? 或是應該要選以上皆非了..

o.o

--