【简答题】Vincent got up at half past six in the morning. He hurriedly put on his clothes and finished the 1 prepared by Grandma . His grandparents were the only two people 2 with him. As soon as he waved goodb...
【简答题】Complete the dialogues with the full or bare infinitive of the verbs in brackets 1 . A: Judy, I’d like (talk) to you for a minute. Are you busy? B: I’m never too busy (talk) to you. What’s up? A: Look...
【判断题】查找效率最高的二叉排序树是平衡二叉排序树。
【单选题】患者神情默然,如寒无寒,如热无热,时欲饮食,时不欲食,卧起不宁,口苦,脉微数,尿赤者,治宜:( )
【简答题】I have been using the Internet since I was five years old, when my dad first sat me down in front of a computer and connected me the World Wide Web. I’ve always felt like a of the Internet worl...
【单选题】有关酶竞争性抑制剂特点的叙述,错误的是
D.
抑制剂恒定时,增加底物浓度,能达到最大反应速度
【单选题】We haven’t been able to find out the ______ of the rumor.
【单选题】在生物化学反应中,当底物与酶的活性位点形成互补结构时,可催化底物发生变化,如图I所示。酶的抑制剂是与酶结合并降低酶活性的分子。竞争性抑制剂与底物竞争酶的活性位点,非竞争性抑制剂和酶活性位点以外的其他位点结合,从而制酶的活性,如图II、Ⅲ所示。下列有关叙述正确的是()
B.
当提高底物浓度后,底物分子与酶活性部位结合的几率增加,使抑制剂的作用减弱
C.
竞争性抑制剂的化学结构与底物的结构相似,非竞争性抑制剂的分子结构与底物的不相似