OCR A Level Biology:复习笔记2.3.5 DNA Replication
Semi-conservative Replication of DNA Before a (parent) cell divides, it needs to copy the DNA contained within it Doubling the DNA ensures that the two new (daughter) cells produced will both recei...
Semi-conservative Replication of DNA Before a (parent) cell divides, it needs to copy the DNA contained within it Doubling the DNA ensures that the two new (daughter) cells produced will both recei...
DNA Purification Practical investigations can be conducted to purify (isolate) DNA via the process of precipitation Isolating DNA from cells is an essential starting point for a huge range of other...
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...
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...
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...
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 ...
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 ...
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...
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...
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