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There are two main parts to meiosis - meiosis I and meiosis II. In meiosis I, crossing over of homologous chromosomes occurs during prophase I, allowing exchange of genetic material between the two parent...

The ruched, cloud-like structure of the alveoli means that there is a large surface area for gas exchange between the blood and the lungs, which increases the efficiency of the process, meaning the suppli...

Enzymes are small proteins found in living organisms. They are described as biological catalysts, meaning they speed up reactions and remain unchanged at the end, ready to do the same aga...

The antigens present on the cell surface membranes of organs are different from person to person due to genetic variation (leading to protein tertiary structure variation - remember antigens are proteins ...

Osmosis can be described as the movement of water from a high concentration to a low concentration through a semi permeable membrane.In this example the salt solution has roughly the same concentration of...