AQA 3.1 biological molecules - 10 good practice questions on carbohydrates

3.1.2

Can you

  • Draw the formation and hydrolysis of a glycosidic bond

  • Name the 3 disaccharides and their components

  • Explain why polysaccharides are good storage molecules ?

  • Explain why are branched polysaccharides good ?

  • Explain how are the properties of cellulose explained by the structure ?

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  • Weekly group classes for AQA Y12 and AQA Y13

Carbohydrates, lipids and Food tests - Resources to Test your understanding

Powerpoints, videos and animations, a self marking quiz on lipids and carbohydrates.

Some tips

  • Number the carbons and understand when and how a 1,4 glycosidic bond forms.

  • Why it matters that you can form a 6,1 bond in order to branch a polysaccharide.

  • Why does it matter that polysaccharides are insoluble and mono and di-saccharides are soluble.

  • What is the consequence of Beta glucose forming cellulose

  • Which molecules have a 5 carbon sugar in mammals ?

  • Can you explain why fatty acids are non-polar and what is the consequence for the formation of cell membranes

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Respiration - Test your understanding, tips, resources and a quiz

Oxygen is the final electron acceptor. It oxidises the final carrier in the ETC on the inner mitochondrial membrane and is reduced to water.

Hydrogen ions flow from the inter membrane space into the matrix via ATP synthase, this electrochemical gradient phosphorylates ADP.

Hydrogen ions are pumped from the matrix into the inter membrane space, using the energy from the electrons flowing along the ETC. The electrons come from the oxidation of food, transferred by coenzymes NAD and FAD.

Glycolysis occurs in the cytoplasm. Link and Krebs in the matrix. Link and Krebs produce carbon dioxide by the removal of a carboxyl group.

Fermentation is just glycolysis with a different way of regenerating NAD (from NADH) by the reduction of pyruvate (or ethanal).

Substrate level phosphorylation is the direct addition of phosphate to ADP, occurs in glycolysis (4 ATP) and Krebs (once per turn), chemiosmosis is H ions flowing through ATP synthase.

Cristae give a larger surface area for oxidative phosphorylation

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