【判断题】本课程讲授者认为发明DDT作为杀虫剂获得诺奖是个失误

【简答题】Sugar—free beets（甜菜）that still taste sweet, tastier tomatoes and brighter-colored fruits and vegetables that stay ripe（熟的）longer are all foods that are being grown now. How can theycarry traits, such ...

【判断题】白僵菌是寄生于昆虫的细菌，因此被人类利用作为微生物杀虫剂。（ ）

【简答题】微生物杀虫剂的微生物类型包括( )、( )、( )、( )等4种。

【单选题】Many Americans harbor a grossly distorted and exaggerated view of most of the risks surrounding food．Fergus Clydesdale, head of the department of food science and nutrition at the University of Massac...

【单选题】下面杀虫剂属于蜕皮激素类似物的是

【简答题】白僵菌高孢粉是国家林业局推广的高效生物杀虫剂之一，应用于多种林木和农作物害虫的防治。白僵菌分生孢子在寄主表皮、气孔或消化道上，遇适宜条件开始萌发，生出芽管。同时产生脂肪酶、蛋白酶、几丁质酶等溶解昆虫的表皮，通过芽管入侵虫体，在虫体内生长繁殖，消耗寄主体内养分，产生各种毒素，形成大量茵丝和孢子，布满虫体全身。请回答下面的问题： (1)从自然菌样中筛选较理想生产用菌种的一般步骤是：采集菌样→富集培养→...

【单选题】Supporters of the biotech industry have accused an American scientist of misconduct after she testified to the New Zealand government that a genetically modified (GM) bacterium could cause serious dam...

【判断题】卫生间每周要对地面喷洒杀虫剂一次，尤其注意对地漏处的喷洒。

【单选题】在农业上的应用微生物杀虫剂主要有（ ）