問題詳情
★.藍菌的異形細胞在構造上和功能上皆異於營養細胞，前者有固氮的作用，固氮作用最重要的酵素固氮 ，其對氧極端敏感。異形細胞具有三層壁，阻礙氣體擴散，任何由鄰近細胞擴散進來的氧都被耗在呼吸作用，因此氧不會在異形細胞內堆積。固氮 可固定經由營養細胞進來的氮。異形細胞是由營養細胞發育而來，首先，營養細胞內的葉綠囊膜會溶解掉，再形成新的內膜。此種過程會消弭光系統Ⅱ，因此在異形細胞內光反應無水的分解。光系統Ⅰ經由循環磷酸化作用產生的能量提供給固氮作用。由營養細胞可運送碳化合物至異形細胞，其新陳代謝所產生的能量可用來固定氮。氮氣會被固定為氨，氨再轉化為胺基酸，然後由此轉運至其他細胞。
29.藍菌的營養細胞和異形細胞內各含有哪幾種光系統？
(A)
(B)
(C)
(D)
29.藍菌的營養細胞和異形細胞內各含有哪幾種光系統？
(A)
(B)
(C)
(D)
參考答案
答案：[無官方正解]
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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