Edexcel A Level Biology A (Salters-Nuffield)
Edexcel A Level Biology A (Salters-Nuffield) Topic 1: Carbohydrates, Lipids and Diet Exam Questions
Free Edexcel A Level Biology A (Salters-Nuffield) exam questions on Topic 1: Carbohydrates, Lipids and Diet, with mark schemes. Covers monosaccharides, disaccharides, polysaccharides, triglycerides, energy balance and cholesterol.
Topic 1: Carbohydrates, Lipids and Diet exam questions
These packs of real past exam questions cover the whole of Topic 1: Lifestyle, Health and Risk, including Topic 1: Carbohydrates, Lipids and Diet. Work through every question on this sub-topic, then mark your answers against the mark scheme.
StemUp mark scheme flashcards
Edexcel A Level Biology A (SNAB) 9BN0 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About Edexcel A Level Biology A (Salters-Nuffield) Topic 1: Carbohydrates, Lipids and Diet
This part of Topic 1 covers the biological molecules in our diet and how diet affects health. Expect drawing glycosidic and ester bonds and energy balance calculations.
What you need to know
- Carbohydrates Glucose, fructose and galactose form disaccharides by condensation with glycosidic bonds. Starch and glycogen are storage polysaccharides.
- Lipids Triglycerides form from glycerol and three fatty acids by condensation with ester bonds. Saturated and unsaturated fatty acids differ in double bonds.
- Energy budget Energy in minus energy out determines weight change. BMI and waist-to-hip ratio estimate obesity.
- Cholesterol LDLs carry cholesterol to tissues and are linked to atheroma; HDLs carry it to the liver.
Common mistakes in Topic 1: Carbohydrates, Lipids and Diet
- Calling hydrolysis a condensation reaction.
- Mixing up LDLs and HDLs.
- Drawing glycerol with fatty acids joined by glycosidic bonds.
Try three Topic 1: Carbohydrates, Lipids and Diet exam-style questions
1. Name the bond formed between two glucose molecules. (1 mark)
Show the mark scheme answer
Glycosidic bond.
2. Explain why glycogen is a good energy store in animals. (3 marks)
Show the mark scheme answer
Highly branched so many ends for rapid hydrolysis to glucose (1); compact so lots stored in small space (1); insoluble so does not affect water potential (1).
3. Explain why high LDL levels increase the risk of CVD. (2 marks)
Show the mark scheme answer
LDLs carry cholesterol to body tissues (1), so high levels increase cholesterol deposits in artery walls forming atheroma (1).
Topic 1: Carbohydrates, Lipids and Diet FAQs
What does this part of SNAB Topic 1 cover?
Carbohydrates, lipids, energy budgets and cholesterol in relation to diet and CVD.
Do I need to draw molecules?
Yes. Be able to show condensation and hydrolysis forming glycosidic and ester bonds.
Are statins examined?
Yes, as one of the treatments for CVD alongside antihypertensives, anticoagulants and platelet inhibitors.
Revise this topic with flashcards: Edexcel A Level Biology A (SNAB) 9BN0 Flashcards, with mark scheme answers for Anki and Quizlet.
