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【单选题】
The typical sorting signal on a protein is a continuous stretch of amino acid sequence, typically ________ amino acids long. This signal sequence is often (but not always) removed from the finished protein once it has been sorted.A.
10–30
B.
10–60
C.
15–40
D.
15–60
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【简答题】以下是某研究小组探究影响反应速率部分因素的相关实验数据。 (1)通过实验①和②对比可知，化学反应速率与_________有关；从实验③和④对比可知，化学反应速率与温度的关系是_____________________________； (2)化学反应的实质是微观粒子相互接触、碰撞的结果，化学反应速率与微观粒子的概率有关。试从微观角度解释“反应物浓度越大，化学反应速率越快”的原因是_________...
【单选题】Nothing but one desk and six chairs _____ in the room.
A.
are
B.
are left
C.
is stayed
D.
is
【单选题】Nothing but one desk and six chairs ________ in the room.
A.
are
B.
is
C.
has
D.
have
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