A.运载“Park”核苷酸进入细胞膜
B.参与微生物多种胞外多糖的生物合成
C.将肽聚糖单体送入细胞膜外的细胞壁生长点处
D.前后两条糖链上的短肽通过甘氨酸五肽桥相连接
第7题
A、search manually in her local library.
B、conduct interviews and surveys or organize a focus group.
C、search the Internet for related Web sites.
D、review scientific experiments conducted by experts.
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