【单选题】Food which is kept too long decays because it is attacked by yeasts(酵母菌),moulds (霉) and bacteria(细菌). The canning process, however, seals the product in a container so that no infection can reach it, ...
【单选题】Which of the following statements about yeasts are true? (1) Yeasts are fungi. (2) Yeasts can form pseudohyphae. (3) Yeasts reproduce asexually by budding. (4) Yeasts are facultatively anaerobic. (5) ...