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...
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...
CAIE考试局A-Level近四年A和A*率数据统计！六大科目难度如何？
A-Level总共有70多门科目。一般来说，中国学生最常选的科目有数学、进阶数学、物理、化学、经济、生物这6门课程。 这些科目属于基础学科，不仅学术性强，更能考察学生的学习能力和逻辑思维能力，因此也备受各大高...
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...
