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Both antigenic shift and drift are used by viruses to adapt to selection pressures and avoid host immune systems.
Antigenic shift is a slow change in the viral genes ove...
White blood cells in the body can attack pathogens, which are micro-organisms which cause disease.
The white blood cells can ingest the pathogen, produc...
In the first stage of Meiosis 1 - Prophase 1, after the chromosomes have coiled and condensed they ay touch each other at points known as chiasmata, and Crossing Over occurs. This is where genetic info...
Contraction of the heart is myogenic meaning it initiates from within the heart muscle itself (myo=muscle, genic= created). Therefore, no extra nerves need to signal the heart t...
pentose sugar and phosphate group backbone
nitrogenous base
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