- What are viral genes?
- What is the oldest virus?
- What is it called when a virus reproduces?
- What is the largest virus in the world?
- Do viruses have genetic codes?
- Do viruses have evolution?
- What is the code of DNA?
- Do viruses kill their host?
- How many genes are in a virus?
- Do viruses move?
- Do Viruses grow and develop?
- Are all viruses created?
- Where did Ebola come from?
- How are viruses created?
- Do viruses steal DNA?
- Are viruses living?
- What diseases are caused by viruses?
What are viral genes?
A virus has either DNA or RNA genes and is called a DNA virus or a RNA virus, respectively.
The vast majority of viruses have RNA genomes.
Plant viruses tend to have single-stranded RNA genomes and bacteriophages tend to have double-stranded DNA genomes..
What is the oldest virus?
Smallpox and measles viruses are among the oldest that infect humans. Having evolved from viruses that infected other animals, they first appeared in humans in Europe and North Africa thousands of years ago.
What is it called when a virus reproduces?
Most viruses reproduce through a process called lytic infection. During lytic infection, a virus enters the host cell, makes a copy of itself, and causes the cell to burst, or lyse.
What is the largest virus in the world?
MimivirusMimivirus is the largest and most complex virus known.
Do viruses have genetic codes?
A virus is a small collection of genetic code, either DNA or RNA, surrounded by a protein coat. A virus cannot replicate alone. Viruses must infect cells and use components of the host cell to make copies of themselves.
Do viruses have evolution?
Viruses undergo evolution and natural selection, just like cell-based life, and most of them evolve rapidly. When two viruses infect a cell at the same time, they may swap genetic material to make new, “mixed” viruses with unique properties. For example, flu strains can arise this way.
What is the code of DNA?
Genetic code is the term we use for the way that the four bases of DNA–the A, C, G, and Ts–are strung together in a way that the cellular machinery, the ribosome, can read them and turn them into a protein. In the genetic code, each three nucleotides in a row count as a triplet and code for a single amino acid.
Do viruses kill their host?
Most viral infections eventually result in the death of the host cell. The causes of death include cell lysis, alterations to the cell’s surface membrane and various modes of programmed cell death. Some viruses cause no apparent changes to the infected cell.
How many genes are in a virus?
The smallest viruses have only a few genes; the largest viruses have as many as 200. Genetically, however, viruses have many features in common with cells.
Do viruses move?
How do viruses multiply? Due to their simple structure, viruses cannot move or even reproduce without the help of an unwitting host cell. But when it finds a host, a virus can multiply and spread rapidly.
Do Viruses grow and develop?
Living things grow. They use energy and nutrients to become larger in size or more complex. Viruses manipulate host cells into building new viruses which means each virion is created in its fully-formed state, and will neither increase in size nor in complexity throughout its existence. Viruses do not grow.
Are all viruses created?
These studies have shown us that viruses do not have a single origin; that is, they did not all arise from one single virus that changed and evolved into all the viruses we know today. Viruses probably have a number of independent origins, almost certainly at different times.
Where did Ebola come from?
Ebola virus was first discovered in 1976 near the Ebola River in what is now the Democratic Republic of Congo. Since then, the virus has been infecting people from time to time, leading to outbreaks in several African countries.
How are viruses created?
A virus is made up of a core of genetic material, either DNA or RNA, surrounded by a protective coat called a capsid which is made up of protein. Sometimes the capsid is surrounded by an additional spikey coat called the envelope.
Do viruses steal DNA?
When viruses infect cells, they hijack the machinery inside and start to use it for their own purposes. This enables viruses to generate more viral particles that can exit the cell and spread the virus to even more cells.
Are viruses living?
Viruses are not living things. Viruses are complicated assemblies of molecules, including proteins, nucleic acids, lipids, and carbohydrates, but on their own they can do nothing until they enter a living cell. Without cells, viruses would not be able to multiply. Therefore, viruses are not living things.
What diseases are caused by viruses?
Viral diseasessmallpox.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.More items…•