Biology Key Words

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  • Created by: Suhana97
  • Created on: 02-03-15 12:30
Hydrogen Bonds occuring between water molecules.
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Hydrogen bonds occuring between water and other molecules.
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The net diffusion of water molecules through a semi-permeable membrane from a high concentration to a low concentration.
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The movement of single molecules from a high concentration gradient to a low concentration gradient. (NB - no energy from ATP required)
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Active Transport
The movement of molecules across a cell membrane from low concentration to high concentration, assisted by enzymes and requiring energy.
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Carrier Proteins
These move large molecules into or out of a cell, down a concentration gradient.
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Channel Proteins
These form pores in the membrane for charged particles to diffuse through, down a concentration gradient.
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Glycosidic Bond
The bond that is made between two glucose molecules, formed in a condensation reaction.
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A lipid with one molecule of glycerol and 3 fatty acids.
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Primary Structure of Protein
The sequence of amino acids in the polypeptide chain, held together by peptide bonds.
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Secondary Structure of Protein
H-bonds form between amino acids in the chain, making the structure coil into an alpha helix or a beta pleated sheet.
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Electrostatic Attraction
Attraction between a slightly positive atom and a slightly negative atom of another molecule.
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Separation of charge within a water molecule of slightly positive hydrogen atom and a slightly negative oxygen atom.
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Surface Tension
Property of liquids, behaving as if the surface is covered by a thin elastic layer.
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Act as both an acid - forms H+ ions and is a proton acceptor and a base
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Hydrogen bonds occuring between water and other molecules.

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Active Transport


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