RANDOM Flashcards
The smallest virus is about the size of the _______of a red blood cell
LARGE HEMOGLOBIN MOLECULE
The first photographs of viruses were obtained in
1940
A negative staining procedure developed in
1959
Some Viruses called___cause specific type of cancer; including human cancers such as lymphomas carcinomas and some types of leukemia
ONCOGENIC VIRUSES OR ONCOVIRUSES
Viral genomes are usually
CIRCULAR MOLECULES
Within the host cell single-stranded positive-sense rna functions as
MESSENGER RNA (mRNA)
Single stranded negative-sense rna serves as a
TEMPLATE FOR THE PRODUCTION OF mRNA
Because because they are not composed of cells viruses are not considered to be living organisms. They are referred to as
A CELLULAR MICROBES OR INFECTIOUS PARTICLES
Viruses that infect bacteria are known as
BACTERIOPHAGES
Like all viruses they are_____in that they must enter a bacterial cell to replicate
OBLIGATE INTRACELLULAR PATHOGENS
There Are three categories of bacteriophages based on their shape
ICOSAHEDRON BACTERIOPHAGES
FILAMENTOUS BACTERIOPHAGES
COMPLEX BACTERIOPHAGES
An almost spherical shape with 20 triangular facets the smallest _____are about 25 nm in diameter
ICOSAHEDRON
Long tubes formed by capsid protein assembled into a helical structure they can be up to about 900 nm long
FILAMENTOUS
Icosahedral head attached to helical table me also possesses base plate and tail fibers
COMPLEX
Always because what is known as the lytic cycle, which ends with the destruction of the bacterial cell. Fore most phages the whole process takes less than one hour
VIRULENT BACTERIOPHAGES
