【简答题】糖胺聚糖是一类含有()和() 的杂多糖,其代表性化合物是() 、() 、() 、和()。
【单选题】澳大利亚科学家巴里 · 马歇尔和罗宾 · 沃伦因发现人体胃中有导致胃炎、胃溃疡和十二指肠溃疡的细菌 —— 幽门螺杆菌,获得了 2005 年诺贝尔生理学和医学奖,幽门螺杆菌不具有的结构是...
【简答题】糖胺聚糖(glycosaminoglycan),是一类含氮杂多糖,也叫粘多糖。其结构是由糖醛酸和糖胺结合的二糖单位重复排列而成的长链多糖,主要存在于高等动物软骨、腱等结缔组织中。代表性糖胺聚糖有硫酸软骨素、硫酸角质素、硫酸皮肤素、透明质酸、肝素等。
【简答题】糖胺聚糖是一类含 和 的杂多糖,其代表性化合物有 、 和 等。
【单选题】听力原文:W: What's t11e weather like today? M: It's sunny. Q: What are they talking about? (21)
【单选题】听力原文:W: Harry, could you give me a hand? M: Yes, what's up? W: How can I set up an e-mail account? M: That's easy. I can set it up for you if you want. W: Thank you. Will it take you long? M: No. I'm ...
A.
She wants Harry to help her open a savings account.
B.
She wants to change her e-mail account.
C.
She wants Harry to help her set up an e-mail account.