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biology a level 2022 paper 1 2023 with verified questions and answers
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10

February 2023

2022/2023

A+
what is simple diffusion molecules pass directly through the plasma membrane without the assistance of another molecule, from a higher concentration to a lower concentration. when is simple diffusion used to allow molecules to travel in and out of the cell membrane: examples water, o2, co2 and ethanol. What is a phospholipid? It is a lipid that has a phosphate group attached to the glycerol and only two fatty acid chains. What is a protein? chain of amino acids ...
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