CELLS AND VIRUSES

By: Gabriel Mekonnen

Cell

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Viruses

Lytic and Lysogenic



    The lytic cycle is one of the two cycles of viral reproduction, the other being the lysogenic cycle. The lytic cycle results in the destruction of the infected cell and its membrane. Lysogeny is characterized by integration of the bacteriophage nucleic acid into the host bacterium's genome or formations of a circular replicon in the bacterium's cytoplasm.

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Characteristics of Life

Most scientists consider viruses to NOT be a living thing, but that is arguable. Viruses show traits similar to living things, such as being made of proteins and glycoproteins, just like cells, they evolve to adapt, and they contain genetic information to produce more viruses in the form of DNA/RNA.

Questions

1. Describe the typical structure of a virus. What is a virus made of? What biomolecules

would you find in a virus?

A: Biomolecules-> Protein. Structure= head(capsid), collar, core, sheath, baseplate, and tail fibers.


2. Discuss the different ways viruses gain entry into a cell.

A: By attaching to a cell after infection, then injection of DNA/RNA


3. Explain why the Ebola virus would not infect a tobacco plant.

A: Because the Ebola virus only attacks animal cells.


4. Name five viruses and the type of cell that they attack.

A: Influenza- animal

Ebola-animal

Measels-animal

Bacteriophage- bacteria

HIV- animal


5. You have been diagnosed with the flu. Explain why a doctor will not provide you

with a prescription for antibiotics in order to cure your infection.

A: Because antibiotics won't affect a virus.