OCR A Level Biology:復習筆記2.3.8 Translation
Translation Translation occurs?in the cytoplasm?of the cell After leaving the nucleus via a nuclear pore, the?mRNA molecule attaches to a ribosome In the cytoplasm, there are?free molecules of tRNA...
OCR A Level Biology:復習筆記2.3.7 Transcription
Transcription A?gene?is a?sequence of nucleotide bases?in a DNA molecule that?codes for the production of a specific sequence of amino acids, that in turn make up a?specific polypeptide?(protein) T...
OCR A Level Biology:復習筆記2.3.6 The Genetic Code
Nature of the Genetic Code A?gene?is a?sequence of nucleotides?that forms part of a DNA molecule (one DNA molecule contains many genes) This sequence of nucleotides (the gene)?codes for the product...
CIE IGCSE Biology: 復習筆記：5.1.3 Enzyme Action & Specificity: Extended
CIE IGCSE Biology: 復習筆記：5.1.3 Enzyme Action & Specificity: Extended Enzyme Action & Specificity: Extended Enzymes are?specific?to one particular substrate(s) as the?active site?of the ...
OCR A Level Biology:復習筆記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...
OCR A Level Biology:復習筆記2.3.4 DNA Purification
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...
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...
