Exam 32: Microbial Interactions

The ectosymbionts of ruminant animals are useful to their hosts in which of the following ways?

A species of bacterium associated with the oil glands of the skin belongs to the genus

In commensalism

When two different microbes are engaged in a cooperative relationship,they do as well when living separately as they do when living together.

__________ enzymes catalyze the hydrolysis of beta (1-4)linkages between successive D-glucose residues of cellulose.

When members of the normal microbiota of the human body become pathogenic and produce disease under certain circumstances,they are referred to as ______________ pathogens.

________________ is a predator that bores a hole through the outer membrane of its gram-negative bacterial prey and then reproduces in the periplasm.

The skin surface (epidermis)is a very favorable environment for colonization by microorganisms.

In mutualism

A close physical relationship between two different species that may or may not be beneficial is called __________.

Microorganisms commonly associated with the human body are traditionally referred to as the

Methanogens are always engaged in relationships with other microbes because methane production requires

The lower respiratory tract has a normal microbiota.

____________ arises when different microbes within a population or community try to acquire the same resource.

The term ____________ is used to describe a mutually beneficial association in which the growth of an organism is dependent on one or more growth factors,nutrients,or substrates provided by another organism in the same vicinity.

Escherichia coli is the most prevalent bacterium found in the colon.

Which of the following would you not find in the nasopharynx?

Microbiota of the skin are most likely to be found