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Hello students in this question it is talking about cell membrane, cell membrane permeability.
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The question is asking the first question which factors determine the criteria for molecules for crossing the cellular membrane.
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The answer will be polarity of the molecule, polarity and the science.
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In the next question it is asking which type of molecules can pass and cannot pass through the cell membrane.
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Non -polar, non -polar molecules like oxygen, carmtoxide and water can pass through the cell membrane.
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That is cross the are soluble in the lipid bilayer and can easily cross the cell membrane.
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And larger, larger uncharged polar molecules like glucose cannot pass through the cell membrane.
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In the next part of the question, it is talking about channels and pores.
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It is asking what are channels and pores.
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Channels are the openings at the cell membranes which can help in transport of ions and small molecules whereas pores are filled with water and can also help to transport transport larger larger molecules in the next part it is asking what is the mechanism of transport through the mechanism of transport of molecules through the hydrophobic hydrophobic lipid bilayer the lipid by layer that is is the phospholipids phospholipid bilayers are there which are amphipathic that is having both hydrophobic and hydrophilictiles the molecules diffuse through them through passive transport they they diffuse through this membrane diffuse through this membrane diffuse through the phospholipid phospholipid membrane and in the inside in inside dissolves dissolves with with the aquas solution in the next part of the question it is talking about active and past transport active and passive transport what are these in active transport there is movement movement against the concentration gradient and requires in passive transport there is high to low concentration gradient concentration gradient movement and requires no energy no energy is required in the next part of the question it is asking about exocytosis it is the fusion of secretary vesicles with the plasma membrane and discharge of those vesicles into the external membrane endocytosis cells absorb external material by engulfing it within the cell membrane with the cell membrane...