Advertisement Upgrade to remove ads

Picornaviridae

+ RNA virus, Enterovirus- Polio disease, Picornavirus shape, Rhinovirus- Common cold

Picornaviridae

+RNA virus, Hepatovirus- Hepatitis A, Picornavirus shape

Togaviridae

+RNA, Rubella virus- Rubella ( German measles)
Equine encephalitis virus- Equine encephalitis
Togavirus shape

Flaviviridae

+RNA, Flavivirus- Yellow fever- transmit by mosquito
Togavirus shape

Retroviridae ( 2 copies)

+RNA, HTLV-I =Adult leukemia, tumors
HIV - AIDS

Paramyxoviridae

-RNA, Morbillivirus- Measles
Paramyxorirus shape

Rhabdoviridae

- RNA, Lyssavirus- Rabies

Orthomyxoviridae ( 1 copy in 8 segments)

-RNA, Influenzavirus- Influenza A & B
9 pieces of RNA

Filoviridae

-RNA, Filovirus- Marburg, Ebola

Bunyaviridae ( 1 copy in 3 segments)

-RNA, Hantavirus- Respiratory distress, hemorrhagic fevers

Reoviridae ( 1 copy in 10-12 segments)

Double stranded RNA, Rotavirus- Respiratory and gastrointestinal infection - Reovirus shape

Adenoviridae ( linear DNA)

DNA virus, Human adenoviruses - Respiratory infection- Adenovirus shape

Herpesviridae ( linear DNA)

DNA virus, Simplexvirus- Oral and genital herpes, Varicellovirus- Chickenpox, shingles - Herpesvirus

Poxviridae

DNA virus, Orthopoxvirus- Smallpox, cowpox

Papovaviridae ( circular DNA)

DNA, human papilloma viruses- WArts, cervial and penile cancers, reovirus shape

Hepadnaviridae

DNA, Hepatitis B virus- Hepatitis B

parvoviridae ( linear DNA)

Single stranded DNA viruses, B19-Fifth disease (everythema infectiousum) in children, picornavirus.

Adsorption - 1

the attachment of viruses to host cells
Is chemical attraction. It requires specific protein recognition factors found in the phage tail fibers that bind to specific receptor sites on the host cells.

penetration-2

the entry of virions ( or thier genome) into host cells
Enzyme lysozyme present in phage tails, weakens the bacterial cell wall.

Synthesis-3

the synthesis of new nucleic acid molecules, capsid proteins, and other viral components within host cells while using the metabolic machinery of those cells

Maturation-4

the assembly of newly synthesized viral components into complete virions

Release-5

The departure of new virions from host cells. Release generally, but not always, kills (lyses) host cells

Burst time

the time from adsorption to release is called.
It varies from 20-40 minutes for different phages.

Attachment stage

Attachment of tail fibers to cell wall proteins
Attachment of spilkes, capsid or envelope to plasma membrane protein

Penetration stage

Injection of viral nucleic acid through bacterial cell wall
Endocytosis or fusion ( animal virus)

Uncoating stage

None needed on bacteriophage, Enzymatic digestion of viral proteins on animal virus

Synthesis stage

In cytoplasm- in cytoplasm RNA viruses or DNA viruses, bacterial synthesis ceased- host cell synthesis ceased, viral DNA or RNA replicated, formation of viral mRNA- same on animal virus
Viral components synthesized- viral component synthesized

Maturation stage

Addition of collar, sheath, base plate and tail fibers to viral nucleic acid containing head
Insertion of viral nucleic acid into capsid

Release

Host cell lysis- Budding ( enveloped viruses), cell rupture ( nonenvelopedviruses)

Chronic infection

Lysogeny
Latency, chronic infection, cancer

Viroids

are very different from viruses, each viroid is solely a small RNA molecule

Prions

are infectious particles made of protein. Research indicates that prions are normal proteins that become folded incorrectly

Oncogenes

are viral genes that cause host cells to divide uncontrollably

Protein

A chemical component that is found in all viruses is

Icosahedron

A common polyhedral capsid shape of viruses is a

Bacteriophages

What type of viruses contain the enzyme lysozyme to aid in their infection?

Bacteriophages

Viruses that infect bacteria are called

ectoparasites

parasites can be divided into , such as ticks and lice, which live on the surface of other organisms.

Endoparasites

such as some protoza and worms which live within the bodies of other organisms

Obligate parasites

Most parasites are, they must spend at least soem of their life cycle in or on a host

facultative parasites

are free living such some soil fungi but they obtain nutrients from a host

Permanent parasites

such as tapeworms, remain in or on a host once they have invaded

Temporary parasites

such as many biting insects, feed on and then leave their host

Accidental parasites

invade an organism other than their normal host

Hyperparasitism

refer to a parasite itself having parasites
such as mosquitoes, insect or many human parasitic diseases.

Biological vector

A vector in which the parasite goes through part of its life cycle is a

Mechanical vector

is a vector in which the parasite does not go through any part of tis life cycle during transit

definitive host

hosts are classified as ... if they harbor a parasite while it reproduces sexually

intermediate hosts

If they harbor the parasite during some other developmental stages.

Mosquito is

because parasite reproduces sexually in the mosquito.

Human is

mediate host

REservoir host

are infected organisms that makes parasites available for transmission to other hosts.

Host specificity

refer to the range of different host in which a parasite can mature.

Please allow access to your computer’s microphone to use Voice Recording.

Having trouble? Click here for help.

We can’t access your microphone!

Click the icon above to update your browser permissions above and try again

Example:

Reload the page to try again!

Reload

Press Cmd-0 to reset your zoom

Press Ctrl-0 to reset your zoom

It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.

Please upgrade Flash or install Chrome
to use Voice Recording.

For more help, see our troubleshooting page.

Your microphone is muted

For help fixing this issue, see this FAQ.

Star this term

You can study starred terms together

NEW! Voice Recording

Create Set