1.     Define selectivelypermeable membrane. Why are these important to the cell?Itrefers to a membrane that controls what enters or exits the cell. It is importantbecause it ensures that mineral and protein components enter the cell in acontrolled manner through some special pores.

2.     What is diffusion? Whatis osmosis? How are they the same and how are they different?Diffusionis a process whereby particles move from a region of high concentration to aregion of low concentration.Osmosisis the movement of water molecules from a region where they are highlyconcentrated to where they are less concentrated through a semi-permeablemembrane.Thetwo processes are similar in that; both are passive (do not require energy totake place) and the both involve movement of particles/molecules from a regionof high concentration to regions of low concentration.

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Thedifference between osmosis and diffusion is that, in diffusion, both the soluteand solvent particles move freely while in osmosis, only water molecules moveacross the membrane.3.     Describe the differencebetween passive transport and active transport.Inpassive transport, ions move from a region of high concentration to a region oflow concentration without the use of metabolic energy.Activetransport is where ions move from low concentration to high concentration byuse of metabolic energy which is usually in the form of ATP.4.     What is an enzyme? Whattype of biological molecule are enzymes made from?Anenzyme refers to a biological catalyst that accelerates chemical reactions inthe cells of living organisms without being affected by the process.Theyare majorly protein molecules and hence made up of amino acids.

5.     What is the differencebetween and exergonic and endergonic chemical reaction?Exergonicreaction is a type of reaction in which energy is lost from the system to thesurrounding and the bonds formed are stronger than those being broken.Endergonicreaction on the other hand is one where energy is absorbed from thesurroundings and the bonds being formed are weaker than those broken.6.     What is an active site?Anactive site refers to that part of an enzyme that binds to the catalytic sitewhere a reaction takes place