About 400 results
Open links in new tab
  1. Intro to viruses (article) | Viruses - Viruses | Khan Academy

    A virus is a tiny, infectious particle that can reproduce only by infecting a host cell. Viruses "commandeer" the host cell and use its resources to make more viruses, basically …

  2. Viral replication: lytic vs lysogenic (video) | Khan Academy

    In the lytic cycle, viruses quickly take over the host cell, make many copies, break the cell, and infect other cells. In the lysogenic cycle, viruses sneak into the host's DNA, stay hidden, and wait.

  3. Viruses (article) | Khan Academy

    Reproduction: Viruses cannot reproduce on their own; they require a host cell's ribosomes and other cell parts to replicate. Cells, on the other hand, have all the necessary components for …

  4. Evolution of viruses (article) | Viruses | Khan Academy

    Heritable traits that help a virus reproduce (such as high infectivity for influenza, or drug resistance for HIV) will tend to get more and more common in the virus population over time.

  5. Animal & human viruses (article) | Viruses | Khan Academy

    Animal viruses, like other viruses, depend on host cells to complete their life cycle. In order to reproduce, a virus must infect a host cell and reprogram it to make more virus particles.

  6. Are viruses dead or alive? (article) | Khan Academy

    A virus can live in two different phases – the lytic phase (where the virus actively replicates in a host cell) and the lysogenic phase (where the viral DNA incorporate itself into the cell’s DNA …

  7. Virus structure and replication (video) | Khan Academy

    But from the scale of a virus, you can see that the cell looks like a whole universe that it is emerging from. And this is an important picture because it really gives you a clue about how …

  8. Bacteriophages (article) | Viruses | Khan Academy

    Viruses do not have enough information to replicate their DNA or RNA. In order to replicate the information in the viruses' information code, the virus uses the information in the DNA of a host …

  9. Lytic and lysogenic cycles (video) | Viruses | Khan Academy

    In the lytic cycle, a virus infects a host cell and uses the cell’s machinery to make copies of itself. This process increases the number of viruses inside the host cell until it bursts (or lyses), …

  10. Prokaryote reproduction and biotechnology - Khan Academy

    Prokaryotes reproduce through a cell division process called binary fission. Like mitosis in eukaryotes, this process involves copying the chromosome and separating one cell into two.