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...
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...
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...
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...
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...
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...
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...
按往年惯例，通常9月份开始，不同考区就开始陆续报名。科目选择会让不少学生纠结，好在CollegeBoard给出了“官方标准”，列举了不同年级热门报考科目。目前AP开设了22个门类，37个学科的AP课程。AP课程共有38门学科...
SRY Gene In sexual reproduction in humans, a sperm from a male fuses with, or fertilises, an egg from a female to form a zygote, which then develops into an embryo To begin with the embryo develops...
