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General Biology: Macromolecules and Molecular Biology Basics

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  • Carbohydrates

    Macromolecules used mainly for energy and structure.

  • Proteins

    Macromolecules made of amino acids that perform many functions in cells.

  • Lipids

    Macromolecules including fats, oils, phospholipids, and steroids.

  • Nucleic Acids

    Macromolecules that store and transmit genetic information.

  • Monomer

    A small building block that can join to form a polymer.

  • Polymer

    A large molecule made of repeating smaller units called monomers.

  • Enzymes

    Proteins that speed up chemical reactions.

  • Catalysts

    Substances that speed up chemical reactions without being used up.

  • Substrate

    The molecule an enzyme acts on.

  • Enzyme-Substrate Complex

    The temporary combination of an enzyme and its substrate.

  • Dehydration Synthesis

    A reaction that joins molecules by removing water.

  • Hydrolysis

    A reaction that breaks molecules apart by adding water.

  • Monosaccharide

    A single sugar molecule; the simplest carbohydrate.

  • Disaccharide

    A carbohydrate made of two monosaccharides.

  • Polysaccharide

    A carbohydrate made of many sugar molecules.

  • Glycosidic Linkage

    A bond that connects sugar molecules.

  • Starch

    A plant polysaccharide used to store energy.

  • Glycogen

    A polysaccharide used by animals to store glucose.

  • Cellulose

    A structural polysaccharide found in plant cell walls.

  • Chitin

    A structural polysaccharide found in arthropod exoskeletons and fungal cell walls.

  • Phospholipids

    Lipids that are major components of cell membranes.

  • Steroids

    Lipids with a structure made of four connected rings.

  • Fatty Acids

    Long hydrocarbon chains that are components of many lipids.

  • Saturated Fat

    A fat with no carbon-carbon double bonds.

  • Unsaturated Fat

    A fat with one or more carbon-carbon double bonds.

  • Amino Acid

    The monomer that makes up proteins.

  • Peptide Bond

    The bond connecting amino acids in a protein.

  • Primary Structure

    The specific sequence of amino acids in a protein.

  • Secondary Structure

    Local folding of a protein into shapes like alpha helices and beta sheets.

  • Tertiary Structure

    The overall three-dimensional shape of one polypeptide.

  • Quaternary Structure

    The structure formed when multiple polypeptide chains join together.

  • Denaturation

    A change in a protein's shape that can cause it to lose its function.

  • Gene

    A section of DNA that contains information for a functional product.

  • mRNA

    Messenger RNA; carries genetic instructions from DNA to ribosomes.

  • Nucleotide

    The monomer that makes up nucleic acids.

  • Nitrogenous Base

    A nitrogen-containing part of a nucleotide.

  • Purine

    A nitrogenous base with two rings, e.g., adenine and guanine.

  • Pyrimidine

    A nitrogenous base with one ring, e.g., cytosine, thymine, uracil.

  • Phosphodiester Bond

    A bond that connects nucleotides in a nucleic acid strand.

  • Double Helix

    The twisted ladder-shaped structure of DNA.

  • Antiparallel

    Describes DNA strands running in opposite directions.