BIOLOGY - UNIT 6: MICROBIOLOGY

nucleoid

area of prokaryotic cell that is dense with genetic material

salinity

concentration of salt in water

normal flora

microorganisms commonly found living in or on a human

symbiosis

mutually positive relationship

During a latent infection caused by a virus, the viral replication is _________ until some outside stimulant causes the virus to enter the lytic cycle.

postponed indefinitely

A virion is able to recognize the correct host cell when the _________ of the host cell and the viral attachment protein of the virion match up

receptor site

lysis

rupturing of a cell

virologist

scientist who studies viruses

thallus

structure of an alga

Rickettsia is an example of an __________ which can only replicate inside a host cell.

obligate intracellular parasite

saprophyte

obtain food from dead organic material

Bacteria which are part of the normal flora may cause disease when the immune system is compromised. This ailment is called a(n) ________.

opportunistic infection

pathogen

organism which causes disease

parasite

organism which lives in or on another organism

host

organisms in which a parasite lives

viroid

pathogenic RNA molecule

prion

pathogenic abnormal protein structure

___________ is a group of bacteria that used to be classified as algae.

Cyanobacteria

_________ is the material found in the bacterial cell wall that forms a molecular basis of the Gram stain.

Peptidoglycan

phycology

the study of algae

Bacteria share genetic material through the processes called bacterial conjugation, transformation, and ___________.

transduction

Viruses which typically have a lipid covering called an envelope are released from the host cell through ___________.

viral budding

virion

virion

anaerobic

without free oxygen