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What is the smallest component of an animal cell?


Why are cells the smallest living thing?

Cells make up the smallest level of a living organism such as yourself and other living things. The cellular level of an organism is where the metabolic processes occur that keep the organism alive. That is why the cell is called the fundamental unit of life.

What kind of organism is represented by cell A?

Answer: The general structures of prokaryotic cells are a plasma membrane, cytoplasm, ribosomes, and genetic material in the form of DNA and RNA. Unlike eukaryotes, the genetic material in prokaryotes is not surrounded by a nuclear membrane and lies in a region called the nucleoid.

Is virus a cellular organism?

Most biologists say no. Viruses are not made out of cells, they can’t keep themselves in a stable state, they don’t grow, and they can’t make their own energy. Even though they definitely replicate and adapt to their environment, viruses are more like androids than real living organisms.

What virus has DNA?

DNA viruses comprise important pathogens such as herpesviruses, smallpox viruses, adenoviruses, and papillomaviruses, among many others.

Is Ebola a DNA virus?

Like other Filoviruses, Ebola is an enveloped, non-segmented, negative-stranded RNA virus. Ebola virus particles have at their core a viral nucleocapsid composed of a helical single stranded RNA genome wrapped around viral proteins NP, VP35, VP30, and L.

Is polio a DNA virus?

Poliovirus, the prototypical picornavirus and causative agent of poliomyelitis, is a nonenveloped virus with a single-stranded RNA genome of positive polarity. The virion consists of an icosahedral protein shell, composed of four capsid proteins (VP1, VP2, VP3, and VP4), which encapsidates the RNA genome (1).

What is the shape of polio?

Poliovirus is a nonenveloped virus having the shape of an icosahedral capsid (spherical), belonging to the Picornaviridae family. It may cause poliomyelitis (infantile paralysis).

What type of virus causes polio?

Polio is caused by a human enterovirus called the poliovirus. Polio can interact in its host in two ways: Infection not including the central nervous system, which causes a minor illness with mild symptoms.

What is the difference between polio and poliomyelitis?

Poliomyelitis, commonly shortened to polio, is an infectious disease caused by the poliovirus. In about 0.5 percent of cases, it moves from the gut to affect the central nervous system and there is muscle weakness resulting in a flaccid paralysis. This can occur over a few hours to a few days.

What is the new name for polio?

Acute Flaccid Myelitis: The Replacement Polio.

Can the polio virus mutate?

Though rare, when there is insufficient coverage in a community, the vaccine-virus may be able to circulate, mutate, and over the course of 12 to 18 months, cause paralysis. Inactivated poliovirus vaccine (IPV) protects people against all three types of poliovirus.

What is the history of polio?

Major polio epidemics were unknown before the 20th century; localized paralytic polio epidemics began to appear in Europe and the United States around 1900. The first report of multiple polio cases was published in 1843 and described an 1841 outbreak in Louisiana.

What stopped polio?

Several key strategies have been outlined for stopping polio transmission: High infant immunization coverage with four doses of oral polio vaccine (OPV) in the first year of life in developing and endemic countries, and routine immunization with OPV and/or IPV elsewhere.

Where was polio most common?

Polio remains endemic in two countries Afghanistan and Pakistan.

Does the US still vaccinate against polio?

CDC recommends that children get polio vaccine to protect against polio, or poliomyelitis. Inactivated polio vaccine (IPV) is the only polio vaccine that has been given in the United States since 2000.