IB DP Biology: HL復習筆記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復習筆記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考試局A-Level近四年A和A*率數據統計！六大科目難度如何？
A-Level總共有70多門科目。一般來說，中國學生最常選的科目有數學、進階數學、物理、化學、經濟、生物這6門課程。 這些科目屬于基礎學科，不僅學術性強，更能考察學生的學習能力和邏輯思維能力，因此也備受各大高...
IB DP Biology: HL復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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復習筆記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...
IB DP Biology: HL復習筆記6.6.6 Skills: Reproduction Diagrams
Male & Female Diagrams You should be able to?annotate diagrams?of the female and male?reproductive systems?to show the names of the different?structures You should also be able to recall the?fu...
IB DP Biology: HL復習筆記6.6.5 Reproduction: Sex Determination in Females
Oestrogen & Progesterone During early development an embryo develops?embryonic?gonads?that will either become?ovaries?in females or?testes?in males The factor that determines whether the embryo...
