SCIENCE QUIZ 4

salinity

concentration of salt in water

Peptidoglycan

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

normal flora

microorganisms commonly found living in or on a human

symbiosis

mutually positive relationship

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

receptor site

One of the limitations of the light microscope is the

resolving power

lysis

rupturing of a cell

thallus

structure of an alga

All known diseases cause by prions affect the -blank- of the host organisms.

nervous system

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

obligate intracellular parasite

saprophyte

obtain food from dead organic material

pathogen

organism which causes disease

viroid

pathogenic RNA molecule

e. release c. uncoating b. penetration d. replication a. attachment

picture thingy

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

Cyanobacteria

-blank- is composed of large deposits of the silicon exoskeletons of members of the phylum Bacillariophyta.

Diatomaceous earth

nucleoid

area of prokaryotic cell that is dense with genetic material

First, -blank- stain is applied, a series of rinses are used, and then a -blank- stain is applied. A -blank- bacteria culture will stain purple or blue, while a -blank- bacteria culture will stain pink.

crystal violet, safranine, Gram-positive, Gram-negative

prion

pathogenic abnormal protein structure

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

postponed indefinitely

virologist

scientist who studies viruses

virion

single virus unit

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

transduction

Viruses which type have a lipid covering called an envelope are resealed from the host cell through -blank-

viral budding

anaerobic

without free oxygen

-blank- is caused by four known Plasmodium species which rely on a mosquito insect vector.

Malaria

Thermoacidophiles thrive in -blank- environments.

hot, acidic

Bacteria which are part of the normal flora may cause disease when the immune system is compromised. This ailment is called -blank-

opportunistic infection

parasite

organism which lives in or on another organism

host

organisms in which a parasite lives

The thread-like structures which are the building blocks of fungi are called

hyphae

The earth's ocean have a salinity of approximately 3.5% while the Dead Sea has a salinity of approximately -blank-

30%-35%

phycology

the study of algae