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Glycoproteins can be antigens, enabling cell recognition of self and non-self cells. They also act as receptors for molecules such as hormones and drugs ...

Deoxygenated blood reaches the heart and enters into the right atrium. Pressure in the right atrium increases which causes the right atrioventricular valve to open allowing the passing of the blood into t...

Respiratory surfaces must be thin (such as in alveoli which have walls that are 1 cell thick) to create a small diffusion distance for the gases to be exchanged through. They must also have a large surfac...

Atrazine prevents photophosphorylation from occurring because when plastoquinone is disabled H+ ions cannot be pumped into the thylakoid space therefore their will be a reduced proton motive for...