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1. There is a variation of phenotypes in the general population 2) Some characteristics confer an advantage in the environment 3) The organisms with advantageous characteristics survive to breed and p...

Active transport is the movement of solutes, either ions or molecules, across a membrane up their concentration gradient (from low to high concentrations). The process requires a carrier protein which is ...

Body temperature is controlled by the thermoregulatory centre of the brain. After body temperature is detected by temperature receptors, a nerve impulse transmits this signal to the brain...

Both transcription and translation are involved in protein synthesis, transferring the information stored as DNA to amino acids. Transcription is the first process of the two, it is the formation of mRNA ...

When an action potential from a motor neurone stimulates a muscle cell, a number of things happen to cause sarcomeres (the smallest contracting unit of a muscle cell) to shorten and contract very rapidly....