Which of the following is/are the normal flora of human’s large intestine?
a) Bifidobacteria and Bacteriodes
b) Helicobacter sp.
c) Clostridia & Methanogens
d) all of these
Which of the following is/are the benefit/s of normal bacterial flora?
a) excrete vitamins
b) prevent colonization of other pathogens
c) produce natural antibiotics
d) all of these
Disease-causing nature of bacteria become
known after the research of ……
a) L. Pasteur
b) R. Koch
c) Leeuwenhoek
d) both a and b
Today microbial growth is controlled by……..
a) physical methods
b) chemical methods
c) both a and b
d) none of them
Which of the following is/are the physical method/s to control the growth of harmful bacteria?
a) heat and filtration
b) osmotic pressure treatment
c) radiation and desiccation
d) all of these
Heating to ……..°C or more kills vegetative forms of bacterial pathogens within 10 mins.
a) 70
b) 50
c) 100
d) 40
