OCR A Level Biology:復習筆記2.3.3 DNA: Structure
DNA Structure The nucleic acid DNA is a?polynucleotide?– it is made up of?many nucleotides?bonded together in a?long chain A DNA nucleotide DNA molecules are made up of?two polynucleotide st...
OCR A Level Biology:復習筆記2.3.2 Phosphorylated Nucleotides
Structure of ATP & ADP All organisms require a constant supply of energy to maintain their cells and stay alive In all organisms this energy is required for: Anabolic reactions?(building larger...
OCR A Level Biology:復習筆記2.3.1 Nucleotides & Phosphodiester Bonds
Nucleotides DNA and RNA are nucleic acids:?polymers?that are made up of?many repeating units?(monomers) called?nucleotides Each nucleotide is formed from: A?pentose sugar?(a sugar with 5 carbon ato...
OCR A Level Biology:復習筆記2.2.17 Chromatography
Chromatography Chromatography is a technique that can be used to?separate a mixture?into its individual components Chromatography relies on?differences in the solubility?of the different chemicals ...
OCR A Level Biology:復習筆記2.2.16 Finding the Concentration of a Substance
Finding the Concentration of a Substance Benedict’s solution?can be used to carry out a?semi-quantitative?test on a reducing sugar solution to determine the concentration of reducing sugar present ...
OCR A Level Biology:復習筆記2.2.15 Biochemical Tests: Proteins
Biochemical Tests: Proteins The Biuret test can be carried out quickly and easily in a lab to determine if a sample contains proteins Biuret ‘reagent’ contains an?alkali and copper (II) sulfate?whi...
OCR A Level Biology:復習筆記2.2.14 Inorganic Ions
Inorganic Ions An?ion?is an atom (or sometimes a group of atoms) that has an?electrical charge An ion that has a?+ve charge?is known as a?cation An ion that has a?-ve charge?is known as an?anion &n...
OCR A Level Biology:復習筆記2.2.13 Fibrous Proteins
Fibrous Proteins Fibrous proteins?are long strands of polypeptide chains that have cross-linkages due to hydrogen bonds These proteins have little or no tertiary structure Due to a large number of?...
OCR A Level Biology:復習筆記2.2.12 Globular Proteins
Globular Proteins Globular Globular proteins?are?compact, roughly?spherical?(circular) in shape and?soluble?in water Globular proteins form a spherical shape when folding into their tertiary struct...
