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【单选题】
下列哪条不是HIV的主要传播途径A.
同性性行为
B.
异性不洁性行为
C.
共餐共宿
D.
母婴传播
E.
静脉内吸毒
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反馈参考答案：
举一反三
【简答题】Dicer酶(Dicer enzyme)
【单选题】鼻饲插管过程中,病人发生呛咳,呼吸困难时应
A.
嘱病人作深呼吸
B.
将病人头部抬高
C.
立即拔出胃管
D.
停止片刻，嘱深呼吸，再轻轻插入
E.
指导病人做吞咽动作
【多选题】Metal ions as enzyme cofactors, their role is( )
A.
As a component of the enzyme active center, transfer electrons
B.
As a bridge connecting substrates and enzyme molecules
C.
Positive synergy
D.
Stabilizing enzyme molecular conformation
E.
Promoting the formation of covalent compounds between the substrate and the enzyme molecule
【简答题】单体酶(monomeric enzyme)
【单选题】吸收衰减是指超声波在介质中传播时，由于介质的粘滞性而造成质点之间的内摩擦，从而一部分声能变成热能，导致（）。
A.
电能的损耗
B.
频率的损耗
C.
波长的损耗
D.
声能的损耗
【多选题】The effect of pH on enzyme activity is characterized by( )
A.
Each enzyme has its optimum pH
B.
The farther away from the optimum pH of the enzyme, the lower the activity of the enzyme
C.
Peracid or overbase can inactivate the enzyme
D.
The optimum pH of the same enzyme may vary depending on the type and concentration of the substrate
E.
The same pH of the same enzyme is a fixed value
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