Viral Replication Lytic And Lysogenic Cycles Pdf

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viral replication lytic and lysogenic cycles pdf

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Viruses like the ones pictured above are very tiny nonliving particles.

Lytic cycle

The lytic cycle results in the destruction of the infected cell and its membrane. Bacteriophages that only use the lytic cycle are called virulent phages in contrast to temperate phages. In the lytic cycle, the viral DNA exists as a separate free floating molecule within the bacterial cell, and replicates separately from the host bacterial DNA, whereas in the lysogenic cycle, the viral DNA is located within the host DNA. This is the key difference between the lytic and lysogenic bacterio phage cycles. The lytic cycle, which is also referred to as the "reproductive cycle" of the bacteriophage, is a six-stage cycle. The six stages are: attachment, penetration, transcription, biosynthesis, maturation, and lysis.

Lysogeny , or the lysogenic cycle , is one of two cycles of viral reproduction the lytic cycle being the other. Lysogeny is characterized by integration of the bacteriophage nucleic acid into the host bacterium's genome or formation of a circular replicon in the bacterial cytoplasm. In this condition the bacterium continues to live and reproduce normally. The genetic material of the bacteriophage, called a prophage , can be transmitted to daughter cells at each subsequent cell division, and at later events such as UV radiation or the presence of certain chemicals can release it, causing proliferation of new phages via the lytic cycle. The difference between lysogenic and lytic cycles is that, in lysogenic cycles, the spread of the viral DNA occurs through the usual prokaryotic reproduction, whereas a lytic cycle is more immediate in that it results in many copies of the virus being created very quickly and the cell is destroyed. One key difference between the lytic cycle and the lysogenic cycle is that the last one does not lyse the host cell straight away. In the lysogenic cycle, the phage DNA first integrates into the bacterial chromosome to produce the prophage.

Lysogenic cycle

If you're seeing this message, it means we're having trouble loading external resources on our website. To log in and use all the features of Khan Academy, please enable JavaScript in your browser. Donate Login Sign up Search for courses, skills, and videos. Science Biology library Viruses Viruses. The biology of Zika virus. Bacteria-infecting viruses. The lytic and lysogenic cycles.

We've updated our Privacy Policy to make it clearer how we use your personal data. We use cookies to provide you with a better experience, read our Cookie Policy. Bacteriophage phage are obligate intracellular viruses that specifically infect bacteria. Phage have a very simple structure Figure 1. Their genetic material is contained in a prism shaped head, surrounded by a protein capsid. This is connected to the elongated sheath sometimes called the tail by a neck or collar region.

The upcoming discussion will update you about the difference between Lysogenic and Lytic Phases of a Virus. It is called pro-phage or provirus. The pro-phage or provirus replicates only once along with the replication of host genome so that a single particle is transferred to a daughter cell. Top Menu BiologyDiscussion. Five Kingdom Classification of Organisms. Systematics: History, Basics of Study and Types.

Virus Life Cycle

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21.2B: The Lytic and Lysogenic Cycles of Bacteriophages

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