Microbial interactions with humans

Question 1

High concentrations of nutrients near the surface of the mouth promote localised microbial growth. True or false?

Answer 1

True

Question 2

How do bacteria colonise tooth surfaces?

Answer 2

First, attaching to acidic glycoproteins deposited by saliva
extensive growth of microorganisms results in a thick bacterial layer (dental plaque)
high concentrations of acid are produced, as plaque accumulates, leading to decalcification of tooth enamel

Question 3

Most organisms e.g. staph, strep, bacilli colonise the upper respiratory tract. True or false?

Answer 3

True

Question 4

Trachea, bronchi and lungs are part of the _____ respiratory tract

Answer 4

lower

Question 5

sinuses, pharynx, larynx, nasopharynx and oral cavity are part of the _____ respiratory tract

Answer 5

upper

Question 6

pH changes in the urethra can cause pathogens to enter. True or false?

Answer 6

True

Question 7

The vagina is basic. True or false?

Answer 7

False - acidic

Question 8

How is a weakly acidic environment maintained in the vagina?

Answer 8

Lactobacilus acidophilus is a resident of the vagina. It ferments glycogen that is already present into lactic acid