a. Trong hô hấp tế bào thì chất nào đóng vai trò oxi hóa trực tiếp nguyên liệu hữu cơ glucozo ở giai đoạn đường phân và chu trình Crep? O2 đóng vai trò gì trong hô hấp tế bào? b. Người ta thấy rằng hiệu suất của hô hấp tế bào có thể đạt từ 40% đến 55% trong khi dod laoij động cơ xe máy hiệu quả nhất hiện nay cũng chỉ đạt 25% công có ích, còn 75% lãng phí dưới dạng nhiệt. Hãy giải thích vì sao có sự khác nhau trên? c. Tại sao trong hô hấp tế bào năng lượng trong eelectron của NADH và FADH2 không được truyền trực tiếp cho oxi phân tử?

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