皮皮学，免费搜题
登录
搜题
【多选题】
How do aromatic amino acids serve as precursors of many plant compounds?A.
Phenylalanine, tyrosine, and tryptophan are converted to a variety of important compounds in plants.
B.
The rigid polymer lignin, derived from phenylalanine and tyrosine, is second only to cellulose in abundance in plant tissues. The structure of the lignin polymer is complex and not well understood.
C.
Tryptophan is also the precursor of the plant growth hormone indole-3-acetate, or auxin, which is important in the regulation of a wide range of biological processes in plants.
D.
Phenylalanine and tyrosine also give rise to many commercially significant natural products, including the tannins that inhibit oxidation in wines; alkaloids such as morphine, which have potent physiological effects; and the flavoring of cinnamon oil, nutmeg, cloves, vanilla, cayenne pepper, and other products.
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】对区分心理正常与心理异常的原则的理解不正确的是（）。
A.
背离一条原则者不能定为异常
B.
背离一条原则者就可定为异常
C.
背离两条原则者才可定为异常
D.
背离三条原则者才可定为异常
【简答题】在资源配置模型里,没有充分()就会出现(),并导致效率低下。
【简答题】心理正常与心理异常的标准化区分原则是由( )提出的。A. A．李心天（正常心理异常的标准化区分原则） B．许又新（心理健康的三标准） C．郭念锋（正常异常，心理学的区分三原则。心理健康水平十标准） D．陈仲庚
【简答题】区分心理正常与异常的三原则是什么?
【单选题】对判断区分心理正常与心理异常的原则的理解正确的是（）。
A.
背离一条原则者就可能为异常
B.
背离两条原则者才可能为异常
C.
背离三条原则者才可能为异常
D.
背离一条原则者不可能为异常