IB DP Biology: HL复习笔记7.2.3 Transcription
Nucleosomes Regulate Transcription Nucleosomes are the structural unit of DNA packaging in eukaryotes that facilitate supercoiling Within a nucleosome, DNA is wrapped around proteins called histone...
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IB DP Biology: HL复习笔记7.2.2 Environment & Gene Expression
Environment & Gene Expression Environment and Gene Expression An organism’s internal or external environment can influence gene expression patterns The levels of regulatory proteins or transcri...
IB DP Biology: HL复习笔记7.2.1 Regulation of Gene Expression by Proteins
The Promoter Region The function of the promoter Only some DNA sequences code for the production of polypeptides, these are called coding sequences Non-coding sequences produce functional RNA molec...
IB DP Biology: HL复习笔记7.1.6 Skills: Nucleosomes & Molecular Visualisation Software
Skills: Nucleosomes & Molecular Visualisation Software Molecular visualisation software can be used to help understand molecular structures Macromolecules like protein, DNA, RNA and complex car...
IB DP Biology: HL复习笔记7.1.5 Skills: The Hershey & Chase Experiment
Skills: The Hershey & Chase Experiment Which Biomolecule is the Heritable Material? DNA was identified in 1869 but many scientists assumed that protein was the heritable material owing to the f...
IB DP Biology: HL复习笔记7.1.4 DNA Sequencing
DNA Sequencing Application: Use of nucleotides containing dideoxyribonucleic acid to stop DNA replication in preparation of samples for base sequencing DNA sequencing allows for the nucleotide base...
IB DP Biology: HL复习笔记7.1.3 Non-coding DNA
Non-coding Regions of DNA DNA molecules are very long but only certain regions code for the production of polypeptides These are called coding sequences In humans only 1.5% of the genome contains c...
IB DP Biology: HL复习笔记7.1.2 Mechanism of DNA Replication
Leading Strand & Lagging Strand Double-stranded DNA consists of two antiparallel strands (oriented in opposite directions) During DNA replication, the two strands are ‘unzipped’ and DNA polymer...
IB DP Biology: HL复习笔记7.1.1 DNA Structure
Nucleosomes Unlike most prokaryotic DNA which is referred to as ‘naked’, eukaryotic nuclear DNA is associated with proteins called histones (to form chromatin) Histones package the DNA into structu...
