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Evolution Darwin Definition

Descent with modification


Evolution textbook Definition

Change in the genetic composition of a population through time, that is, across generations


AIDS stands for

A cquired I mmuno d eficiency S yndrome



the disease is not hereditary but develops after birth from contact with a disease causing agent (HIV).



– the disease is characterized by a weakening of the immune system.



refers to a group of symptoms that collectively indicate or characterize a disease. In the case of AIDS, this can include the development of co-infections and/or cancers, as well as a decrease in the number of certain cells in a person’s immune system.


What are the steps a Retrovirus takes

RNA → DNA → RNA → Protein


How HIV cause AIDs

destroys CD4 helper T cells, immune response impaired and kills people indirectly by weakening the immune system, allowing opportunistic infections.


Three ways Resistance to AZT occurs

(1) Mutation occurs in the active site of reverse transcriptase

(2) AZT no longer incorporated in new viral DNA. Normal T incorporated preferentially

(3) See the same mutation in different patients

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