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【简答题】
机械加工工艺系统是由 、 、 和 等 4 个要素组成。
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【多选题】Why are the peptide and amine (water-soluble) hormones faster acting than steroid and thyroid (water-insoluble) hormones?
A.
Hormones that act through plasma membrane receptors generally trigger very rapid physiological or biochemical responses. Just seconds after the adrenal medulla secretes epinephrine into the bloodstream, skeletal muscle responds by accelerating the breakdown of glycogen.
B.
By contrast, the thyroid hormones and the sex (steroid) hormones promote maximal responses in their target tissues only after hours or even days.
C.
These differences in response time correspond to different modes of action. In general, the fast-acting hormones lead to a change in the activity of one or more preexisting enzymes in the cell, by allosteric mechanisms or covalent modification.
D.
The slower-acting hormones generally alter gene expression, resulting in the synthesis of more (upregulation) or less (downregulation) of the regulated protein(s).
【简答题】一组排列有序的计算机指令的集合称为( )
【简答题】调制速率是指调制信号状态的每秒转换（），其度量单位是（）。
【单选题】How can hormones help you manage the stress? _____
A.
Hormones make you feel happy.
B.
Hormones make you produce chemicals.
C.
Hormones rebuild our bodies.
D.
Hormones give you energy.
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