OCR A Level Biology:复习笔记2.4.2 Enzyme Action
Mechanism of Enzyme Action Enzymes have an active site where specific substrates bind forming an enzyme-substrate complex The active site of an enzyme has a specific shape to fit a specific substra...
OCR A Level Biology:复习笔记2.4.1 The Role of Enzymes
Enzymes as Catalysts Enzymes are biological catalysts ‘Biological’ because they function in living systems ‘Catalysts’ because they speed up the rate of chemical reactions without being used up or ...
OCR A Level Biology:复习笔记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:复习笔记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:复习笔记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: 复习笔记：5.1.3 Enzyme Action & Specificity: Extended
CIE IGCSE Biology: 复习笔记：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: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...
OCR A Level Biology:复习笔记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:复习笔记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...
