1 Organisms must do work to stay alive. The energy input necessary for this work is either light, for photosynthesis, or the chemical potential energy of organic molecules. Work includes anabolic reactions, active transport and movement. Some organisms, such as mammals and birds, use thermal energy released from metabolic...

A respirometer is a device used to measure the rate of respiration of a living organism by measuring its rate of exchange of oxygen and/or carbon dioxide. They allow investigation into how factors such as age, chemicals or the effect of light affect the rate of respiration.There are various different types of respirometer....

There are many varieties of rice and they differ in their water requirements. Most of the rice in south-east Asia is grown in unusual conditions for a cereal plant. It is grown partly submerged in water in paddy fields.The fields are flooded and then ploughed. Young rice plants are planted in the rich mud formed in these...

The mitochondrion is a power plant and industrial park of the cell where energy stored in the bonds of carbohydrates is converted to a form more useful to the cell (ATP) and certain essential biochemical conversions of amino acids and fatty acids occur.Structure Mitochondria is about 1 mm in diameter and 1-10 mm in...

A respiratory substrate is a molecule from which energy can be liberated to produce ATP in a living cell. Glucose is not the only respiratory substrate. All carbohydrates, lipids and proteins can also be used as respiratory substrates.Many cells in the human body are able to use a range of different respiratory substrates....