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For organisms to grow and repair cells are constantly replicating, and therefore the DNA within cells is also constantly replicating. The process begins with the enzyme DNA helicase break...

1. Sensory neurone detects a stimuli via sensory receptors e.g. a hot pan

2. This sends an impulse up the sensory neuron to the brain or spinal column (together known as the central ...

Because enzymes have a specific tertiary structure which defines the 3D shape of the active site. This means that only a substrate with a complimentary shape to the active site can bind to it and form an ...

"A technician investigated the effect of temperature on the rate of an enzyme-controlled reaction. At each temperature, he started the reaction using the same concentration of substrate. Explain the ...

Structure: The respiratory system starts at the mouth and nose with the pharynx, and continues as the trachea - this is covered with the epiglottis that prevents food and other material entering the lower...