Paper Nook

These detailed revision notes cover WJEC A-Level Biology Unit 1.6: Cell Division. The guide explains chromosomes, the cell cycle, mitosis, meiosis, genetic variation, mitotic index calculations and common exam comparisons. Topics included: Chromosomes, DNA, genes, chromatids and centromeres. Homologous chromosome pairs, maternal and paternal chromosomes. Diploid and haploid chromosome numbers. The cell cycle, including G1, S and G2 stages of interphase. DNA replication and chan...

These detailed revision notes cover WJEC A-Level Biology Unit 1.4: Enzymes. They provide simple explanations of enzyme structure and action, enzyme graphs, inhibition, practical skills and industrial uses of enzymes. Topics included: Enzymes as biological catalysts. Globular protein structure, active sites, substrates and products. Enzyme-substrate complexes and enzyme specificity. The lock-and-key hypothesis and induced-fit hypothesis. Activation energy and how enzymes lower a...

These detailed revision notes cover WJEC A-Level Biology Unit 1.3: Cell Membranes and Transport. The notes are written in clear, student-friendly language and include essential definitions, comparison tables, practical guidance, water-potential calculations and exam-answer wording. Topics included: The structure and functions of the cell surface membrane. The fluid mosaic model. Phospholipid bilayers, hydrophilic phosphate heads and hydrophobic fatty-acid tails. Intrinsic, extrins...

These detailed revision notes cover WJEC A-Level Biology Unit 1.2: Cell Structure and Organisation. They are written in clear, simple language and are designed to help first-year A-Level Biology students understand cell structures, microscopy and biological organisation. Topics included: Cell theory, unicellular organisms and multicellular organisms. Eukaryotic cell structure and the functions of organelles. The nucleus, nucleolus, ribosomes, endoplasmic reticulum, Golgi apparatus an...

These detailed revision notes cover WJEC A-Level Biology Unit 1.1: Biological Compounds. The guide is written in clear, student-friendly language and is designed to help students understand the key biological molecules and prepare for examination questions. Topics included: Inorganic ions, including magnesium, iron, phosphate and calcium. Water structure, polarity, hydrogen bonding and biological properties. Carbohydrates, including monosaccharides, disaccharides and polysaccharides....