How to change the language you use in A level Biology Answers, and get better grades
Read morePractising recall and doing questions is so important for long term retention of information. Try this self marked quiz. OCR A Animal Transport.
Read morePractising recall and doing questions is so important for long term retention of information. Try this self marked quiz. OCR A Biochemistry.
Read morePractising recall and doing questions is so important for long term retention of information. Try this self marked quiz. OCR A Plant Transport.
Read more10% of the marks in Biology papers are for calculations. Here are some good practise questions and a great advice document from OCR (applicable to all boards)
Read moreOCR A Biological diversity (H420/02) June 2018 - Multiple Choice Questions as self marking quiz
Read moreSelf marking quiz for the OCR A Biological processes June 2018 paper
Read moreSelf marking quiz for the OCR AS Biology A H020/01 Breadth in biology paper
Read moreCell cycle, mitosis and cell division. Pack of exam questions on mitosis and meiosis
Read morePowerpoints, 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
Read moreNucleotide structure and DNA replication, useful resources, animations, powerpoints and exam questions. Meselson and Stahl experiments….
Read moreResources for learning the immune system. Powerpoints, animations, videos, self marking test and some rare immune sytem questions.
Read moreMultiple choice questions on enzymes, all past paper questions, a good way to assess your understanding
Read moreMultiple choice questions on cell organelles, all past paper questions, a good way to assess your understanding
Read moreThe new style linear A level Biology exams have a very different approach to assessment so I made recorded lessons of guides to the new specification sample and 2017 A level papers and to the 2016 AS Papers.
Read moreOxygen 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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