The bacterium, E.coli, lives in the large

intestines of mammals and feeds on undigested
food material. E.coli helps to synthesize
vitamin K that is essential for mammalian
blood clotting. The relationship between E.coli
and mammals is a



a. commensalism.
b. mutualism.
c. competition.
d. predation.
e. parasitism


B

Biology & Microbiology

You might also like to view...

Unlike other prokaryotes, archaeons (except Sulfolobus) have two origins of replication.

Answer the following statement true (T) or false (F)

Biology & Microbiology

The simplest technique for isolating bacteria in growth media is referred to as the

A. pour-plate method. B. streak-plate method. C. serial dilution method. D. MPN method.

Biology & Microbiology

Glucose monomers linked into a highly branched chain make up ____

a. glycogen b. cellulose

c. fructose d. starch e. sucrose

Biology & Microbiology

The reticuloendothelial system

A. is a support network of connective tissue fibers. B. originates in the cellular basal lamina. C. is heavily populated with macrophages. D. provides a passageway within and between tissues and organs. E. All of these choices are correct.

Biology & Microbiology