根部形成层开始出现时为( )。

【名词&注释】

同工酶(isozyme)、注意力(attention)、冬虫夏草(aweto)、形成层(cambium)、猴头菇、转主寄生(heteroecism)、血清学方法(serological method)、电泳分析(electrophoresis)、分类学价值、羽状复叶(pinnately compound leaf)

[单选题]根部形成层开始出现时为( )。

A. 条状
B. 束状
C. 波状
D. 圆环

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举一反三：

[单选题]有转主寄生现象的真菌是( )。

A. 锈菌
B. 冬虫夏草
C. 猴头菇
D. 水霉

[单选题]苏铁的营养叶为( )。

A. 鳞叶
B. 单叶，羽状深裂
C. 单叶，全缘
D. 一回羽状复叶^{(pinnately compound leaf)}

[单选题]研究蛋白质的分类学价值时采用以下各种研究方法[除( )以外]。

A. 血清学方法^{(serological method)}
B. 电泳分析^{(electrophoresis)}
C. 同工酶电泳
D. 分子杂交

[单选题]What is the inegge mainly expressed in the story?

A. we should learn to he generous
B. It is honorable to help those in need.
C. People in high postans are not like what we expect
D. We should avoid judging people by their appearances.

[单选题]What can we say about the discovery of Mangrove Rivulus?

A. It was made quite by accident
B. It was based on a lab test of sea life
C. It was supported by an American magazine
D. It was helped by Patricia Wright

[单选题]44_________

A. containing
B. hiding
C. sharing
D. keeping

[单选题]真菌的异养方式为( )。

A. 吞食固形营养物
B. 吸收营养物
C. 寄生
D. 吞食和吸收营养物

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