Who developed the Endosymbiotic theory?

Who developed the Endosymbiotic theory?

Lynn Margulis

What is the evidence of Endosymbiotic theory?

The first piece of evidence that needed to be found to support the endosymbiotic hypothesis was whether or not mitochondria and chloroplasts have their own DNA and if this DNA is similar to bacterial DNA. This was later proven to be true for DNA, RNA, ribosomes, chlorophyll (for chloroplasts), and protein synthesis.

How is endosymbiosis related to the origin of eukaryotes?

Eukaryotic cells arose through endosymbiotic events that gave rise to the energy-producing organelles within the eukaryotic cells such as mitochondria and chloroplasts. The endosymbiotic theory proposes that one organism engulfed another, and the two co-evolved together until they could not exist independently.

Which best describes Endosymbiotic bacteria?

Which best describes endosymbiotic bacteria? They live within other cells and perform specific functions for their host cells.

Do viruses have chloroplast?

The chloroplast, a prime target for viruses, undergoes enormous structural and functional damage during viral infection. Indeed, large proportions of affected gene products in a virus‐infected plant are closely associated with the chloroplast and the process of photosynthesis.

What are the 2 types of viral infections?

Viral infections include:

• the common cold, which mainly occurs due to rhinovirus, coronavirus, and adenovirus.
• encephalitis and meningitis, resulting from enteroviruses and the herpes simplex virus (HSV), as well as West Nile Virus.
• warts and skin infections, for which HPV and HSV are responsible.

What is a hidden virus?

Hidden Viruses: Other viruses do not immediately become active. Instead, they “hide” for a while. After a hidden virus enters a host cell, its genetic material becomes part of the cell’s genetic material. The virus does not appear to affect the cell’s functions and may stay in this inactive state for years.

How do you identify a virus?

Virus identification is performed either by indirect immunofluorescence of virus-infected cells using group- and type-specific monoclonal antibodies, or RT-PCR on extracts of cell supernatants using specific primers or probes.

What is the most common method used to identify viruses?

PCR

How do you know if it’s viral or bacterial?

Diagnosis of Bacterial and Viral Infections But your doctor may be able to determine the cause by listening to your medical history and doing a physical exam. If necessary, they also can order a blood or urine test to help confirm a diagnosis, or a “culture test” of tissue to identify bacteria or viruses.

Do viruses grow on agar?

Viruses cannot be grown in standard microbiological broths or on agar plates, instead they have be to cultured inside suitable host cells.

Can viruses grow anywhere?

Bacteria and viruses thrive in warm, moist environments. But they can live a surprisingly long time almost anywhere you touch: countertops, door handles, curtains, toys, computers, even inside refrigerators and freezers.

Do viruses need nutrients?

So they don’t take in nutrients and they do not grow and increase in biomass in the normal way that we would think of a plant, a bacterium, or an animal increasing in size by uptake of nutrients. They simply replicate by hijacking all the machinery within another cell.

Can virus be cultured in lab?

Cultivation of Viruses. Viruses can be grown in vivo (within a whole living organism, plant, or animal) or in vitro (outside a living organism in cells in an artificial environment, such as a test tube, cell culture flask, or agar plate).

Why are viruses difficult to grow in a laboratory?

Unlike most bacteria that can be grown in artificial media (eg agar plates, nutrient broth) viruses cannot be grown on artificial media but must be grown in living cells. There are only three ways in which viruses can be grown in the laboratory. – surplus cells can be stored indefinitely in liquid nitrogen (-196°C).

Why viruses Cannot grow on artificial media?

Unlike bacteria and other microorganisms which can be grown in artificial media, viruses cannot be grown on artificial media but must be grown in living cells. Viruses cannot be grown on an ordinary culture medium because they are not actually living organisms. Animal and plant viruses are cultivated in cell cultures.

Do viruses have the 7 characteristics of life?

According to the seven characteristics of life, all living beings must be able to respond to stimuli; grow over time; produce offspring; maintain a stable body temperature; metabolize energy; consist of one or more cells; and adapt to their environment.

What are three examples of viruses?

Viral diseases

• smallpox.
• the common cold and different types of flu.
• measles, mumps, rubella, chicken pox, and shingles.
• hepatitis.
• herpes and cold sores.
• polio.
• rabies.
• Ebola and Hanta fever.

What are the two main parts of a virus?

The simplest virions consist of two basic components: nucleic acid (single- or double-stranded RNA or DNA) and a protein coat, the capsid, which functions as a shell to protect the viral genome from nucleases and which during infection attaches the virion to specific receptors exposed on the prospective host cell.