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The sliding filament mechanism is a model used to show the way in which muscles contract. It involved 3 components - Myosin, Actin and Tropomyosin. Myosin has a head like projection to which an ADP molecu...

Generally, increasing the temperature increases membrane permeability. At temperatures below 0 ^oC the phospholipids in the membrane don't have much energy and so they can't move much, which mea...

Following its return to the right atrium via the vena cava, the RBC passes through the mitral valve and into the right ventricle. Upon ventricular contraction, the RBC is ejected via the pulmonary valve a...

Think of them as a flow chart.

Stimulus (a change)
    |
Sensor (detects the change)
    |
Control (sends a signal about t...

Explain the use of proteins as enzymatic catalyats - including examples.

Enyzmes control metabolic pathways - such as in the Krebs cycle.

Proteins/enzymes in photosynthesis - with examples.<...