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Edexcel International AS Level Biology, topic 1

Molecules, Transport and Health

Molecules, Transport and Health is topic 1 of Pearson Edexcel International AS/A Level Biology (XBI11/YBI11) and is examined in Unit 1. It covers water, carbohydrates and lipids, the heart, blood vessels and haemoglobin, the causes of cardiovascular disease, and how health risks are judged and treated, with Core practicals 1 and 2.

Subtopics

Work through them in order. Each one has notes, exam questions and flashcards, and a PDF of each.

  1. 1Water, carbohydrates and lipids Spec 1.1–1.5Water as a polar solvent, the structure of sugars, starch and glycogen, glycosidic and ester bonds, and the colour tests for sugars and starch.NotesQuestions 10Flashcards 18
    1. Water as a solvent in transport
    2. Monosaccharides, disaccharides and polysaccharides
    3. Glycosidic bonds: condensation and hydrolysis
    4. Core practical 1: Benedict’s reagent and iodine solution
    5. Triglycerides and ester bonds
    6. Saturated and unsaturated lipids
  2. 2The heart, blood vessels and haemoglobin Spec 1.6–1.9Why animals need a circulation, how blood vessels suit their jobs, the cardiac cycle, and how haemoglobin carries oxygen and carbon dioxide.NotesQuestions 11Flashcards 18
    1. Why many animals have a heart and circulation
    2. Arteries, veins and capillaries
    3. Structure of the mammalian heart
    4. The cardiac cycle
    5. Haemoglobin and the transport of oxygen and carbon dioxide
    6. The oxygen dissociation curve, the Bohr effect and fetal haemoglobin
  3. 3Cardiovascular disease and its causes Spec 1.10–1.14How atherosclerosis and blood clots lead to cardiovascular disease, the risk factors, dietary antioxidants, and Core practical 2 on vitamin C.NotesQuestions 9Flashcards 14
    1. Atherosclerosis
    2. Blood clotting and cardiovascular disease
    3. Risk factors for cardiovascular disease
    4. Dietary antioxidants and the risk of CVD
    5. Core practical 2: vitamin C content of food and drink
  4. 4Health risks, evidence and treatment Spec 1.15–1.20Analysing health data, judging study design and risk perception, cholesterol and lipoproteins, reducing CHD risk, and the drugs used to treat CVD.NotesQuestions 10Flashcards 19
    1. Analysing data on illness and mortality
    2. Evaluating the design of studies
    3. Perception of risk
    4. Blood cholesterol, HDL and LDL
    5. Evidence linking cholesterol and CVD
    6. Using scientific knowledge to reduce the risk of CHD
    7. Treatments for cardiovascular disease

Whole topic

When you have done the subtopics: test yourself on everything, or print the lot.

Revision notesAll revision notesEvery subtopic in one PDF · 28 pagesDownload PDFWorksheetTopic testAll 40 questions (138 marks) with the mark scheme · 20 pagesDownload PDF
FlashcardsAll flashcards69 cards from every subtopicPractisePrint
Mind mapMind mapThe whole topic on one pageViewPDF