What is the structure of a virus GCSE?
Virus structure Virus particles have a variety of shapes. They do not have a cellular structure. Instead, they have a core of genetic material surrounded by a protein coat. Their genetic material can be DNA or RNA , but not both.
How do viruses make you ill BBC Bitesize?
They infect a host, reproduce themselves or replicate if it is a virus, spread from their host and infect other organisms . They also all have structural adaptations that make them successful at completing their life cycles, which enable them to cause further disease.
How does a virus make you ill GCSE?
Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), with the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system’s antibodies and other cells to target the invader.
Are viruses alive ks3?
The usual answer to this question (and usually for the purpose of passing your Biology GCSEs) is that viruses are not alive, because they do not complete all of the seven life processes: Movement, Respiration, Sensitivity, Nutrition, Excretion, Reproduction and Growth.
What are the virus shapes?
In general, the shapes of viruses are classified into four groups: filamentous, isometric (or icosahedral), enveloped, and head and tail.
What is a virus GCSE ICT?
A computer virus is a simple program made to harm a computer system. It spreads by duplicating and attaching itself to files. Sometimes the damage is minor but often it can be disastrous. ICT.
How are viruses classified according to their shape?
Key Points Viruses are classified into four groups based on shape: filamentous, isometric (or icosahedral), enveloped, and head and tail. Many viruses attach to their host cells to facilitate penetration of the cell membrane, allowing their replication inside the cell.
How is the life cycle of a virus?
The life cycle of a virus is the same as other pathogens. They can often survive outside a host for long periods of time. When they have infected a suitable host cell or cells, they replicate themselves within the cell thousands of times. They do not divide and reproduce, but replicate their DNA and protein coats.
Which is an example of the complexity of a virus?
An interesting feature of viral complexity is that host and virion complexity are uncorrelated. Some of the most intricate virion structures are observed in bacteriophages, viruses that infect the simplest living organisms: bacteria. Example of a virus attaching to its host cell: The KSHV virus binds the xCT receptor on the surface of human cells.
Which is an example of a virus with an envelope?
Morphology. Chicken pox, influenza, and mumps are examples of diseases caused by viruses with envelopes. Because of the fragility of the envelope, non-enveloped viruses are more resistant to changes in temperature, pH, and some disinfectants than are enveloped viruses.