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AQA A level Biology 2022/2023 AQA with verified questions and answers Edexcel A-level biology 2023 with complete solutions questions and answers Edexcel A level Biology with 100% correct questions and and answers biology a level 2022 paper 1 2023 with verified questions and answers

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

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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 ...

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Edexcel A level Biology with 100% correct questions and and answers

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Molecular phylogeny It compares the structure of a particular molecule from different organisms to discover their degree of evolutionary relation. Somatic cell A cell in an organism which isn't a gamete. DNA Deoxyribose nucleic acid. Carries the genetic information for cells and so...

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Edexcel A-level biology 2023 with complete solutions questions and answers

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Describe the events of fertilisation that occur after the acrosome reaction. -Membrane of sperm and egg cell fuse together -cortical granules release contents into zona pellucida -Zona pellucida thickens -Haploid nuclei fuse Explain how phospholipids form a cell surface membrane -Hydroph...

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AQA A level Biology 2022/2023 AQA with verified questions and answers

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Explain why plasma membranes are said to have a fluid mosaic structure. 1. Fluid because the phospholipids are constantly moving. 2. Mosaic because the proteins are scattered throughout the membrane-like tiles in a mosaic. What effect does cholesterol have on the cell membrane? 1.Cholestero...

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