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(Chapter: further human physiology)
Factor + explanation (1 point for each) for coronary heart disease (CHD):-Genetics: CHD tends to run in some families-Age: CHD is a disease of old age-Gender: men...

Calvin carried out ‘feeding experiments’ where radioactive labelled carbon was fed to plants. ¹⁴CO₂ is taken up the cells and is then fixed into photosynthesis. ¹⁴CO_2...

Muscle fibers are comprised of elongated myofibrils. A myofibril is made of repeating chains of sarcomeres which have no nucleus but have myosin and actin filaments which are able to slide past each other...

Overview of oxydative phosphorelation: At the end of the electron transport chain, electrons are transferred to molecular oxygen, which splits in half and takes up H⁺ to form water.

Enzymes catalyse reactions by reducing the activation energy required to begin a chemical reaction, without being used up in the reaction. They bind to the active site of a substrate to form an enzyme-sub...