Science 1003 self test 5

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

envelope, host cell membrane

organisms in which a parasite lives

host

Thermacidophiles thrive in ----- environments.

hot, acidic

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

hyphae

During a(n) ----- infection by a virus, viral replication is continuing but cells are not rupturing in the ----- cycle.

latent, lysogenic

rupturing of a cell

lysis

All known diseases causued by prions affect the ----- of the host organism.

nervous system

Area of prokaryotic cell that is dense with genetic material

nucleoid

Rickettsia and viruses are examples of ----- which can only replicate inside a host cell.

obligate intercellular parasites

Bacteria which are part of the normal flora cause disease when the immune system is compromised. The ailment is called an -----.

opportunistic infection

microorganisms commonly found living in or on a human

parasite

organism which lives in or on another organism

parasite

Organism which cause diseases

pathogen

----- is the material found in the bacterial cell wall that corms the molecular basis of the Gram stain.

pepdidoglycan

study of algae

phycology

Pathogenic abnormal protein structure

prion

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

receptor site, viral attachment

concentration of salt in water

salinity

Obtain food from dead organic material

saprophyte

mutually positive realationship

symbiosis

Stucture of an alga

thallus

single virus unit

virion

pathogenic RNA molecule

viroid

scientist who studies viruses

virologist

The earths oceans have a salinity of approximately 3.5% while the Dead Sea has a salinity of approximately -----.

30% -35%

----- are spherical bacteria; ----- are rod shaped bacteria; and ----- are spring shaped bacteria.

Coccus, baccilus, spirillum

----- is a group of bacteria that use to be classified as an algae.

Cyanobacteria

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

Diatomceous earth

List and describe the steps of a lytic viral replication cycle.

In the first step the virus comesin contact with the host cell and sticks to the cell wall or membrane.Next it has to get inside the host cell. Then it has to get into a place where it will control a host cells manufacturing and assembly. After that, the manufacturing and assembly take place. Last but not least the host cell dies.

One of the limitations of the light microscope is the -----.

Inability to watch live processes

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

Malaria

Without free oxygen

anaerobic

Bacteria share genetic material through the process called -----, ------,and -----,

bacterial conjugation, transformation, transduction