Our skin has over 200 types of yeast, protozoa, and bacteria on its surface. How do these normal flora act as a protective barrier to pathogens?
What will be an ideal response?
The normal flora are protective mostly because they colonize our external body surfaces and take up space so that it cannot be occupied by pathogens. In other words, they deter more dangerous species from colonizing (and penetrating) body surfaces by competing for space and resources.
You might also like to view...
Which enzyme breaks down polysaccharides?
a. sucrase b. amylase c. maltase d. lactase
The portion of a mycorrhizal fungus that penetrates the cell walls of the root cortex is called an
arbuscule. ____________________ Indicate whether the statement is true or false.
Neurotransmitters like acetylcholine
A. are manufactured in the synapse. B. permanently attach to neuronal membranes. C. are always present in the synapse. D. stimulate neurons.
The proposition that the mitochondria in our cells descended from engulfed bacteria is called the ________ theory
Fill in the blank(s) with correct word