WebKey points: A virus is an infectious particle that reproduces by "commandeering" a host cell and using its machinery to make more viruses. A virus is made up of a DNA or RNA genome inside a protein shell called a capsid. Some viruses have an external membrane envelope. … The short answer to these questions is that viruses evolve.That is, the "gene pool" of … Other viruses, such as the hepatitis C virus, cause long-term chronic infections. Still … WebOct 19, 2024 · Pathogens cause illness to their hosts through a variety of ways. The most obvious means is through direct damage of tissues or cells during replication, generally through the production of toxins, which allows the pathogen to reach new tissues or exit the cells inside which it replicated.
Life Cycle and Replication of Viruses (A-level Biology)
WebOnce inside a living cell, viruses re-program the cell’s machinery to produce viral proteins and genetic material to make new copies of themselves. Viruses with an envelope steal a … WebA-level Biology – Pathogens and Infectious Diseases Transmission of Infectious Diseases There are two ways in which infectious diseases can be transmitted: Direct transmission. This is when the pathogens are passed on directly between one host to another. Examples include: Droplet transmission. income tax india brackets
Viruses Effects on Cells How do Viruses Affect the Body?
WebViruses usually inject their all genetic material into one cell, which helps to spread disease through is assembly and release of new viruses from the first infected cell. Sometimes DNA (and RNA) viruses have more strands. For example, the Ebola virus (RNA VIRUS) has 8 strands of RNA. Comment ( 2 votes) Upvote Flag Show more... FATEMA Taher WebIn a nutshell, a virus is a non-cellular, infectious entity made up of genetic material and protein that can invade and reproduce only within the living cells of bacteria, plants and animals. For instance, a virus cannot … WebThree different influenza viruses infect humans to cause the flu Influenza A, influenza B and influenza C infect the cells that line the airways They cause a high temperature, body … income tax india clear tax