单选题 Which scientist discovered penicillin?谁发现了青霉素？

单选题 Which bacterial shape is round?哪种细菌是球形？

单选题 Which is a bacterial disease?哪种是细菌性疾病？

单选题 Which microorganism is smallest in size?哪种微生物最小？

单选题 Which scientist developed the germ theory of disease?哪位科学家提出了疾病的病原学说？

单选题 Vaccine works by:疫苗的作用机制是：

单选题 Which structure is absent in bacteria?细菌中缺乏哪种结构？

单选题 Which organism forms spores?哪种微生物形成孢子？