Cell cycle, mitosis and cell division. Pack of exam questions on mitosis and meiosisRead More
Powerpoints, videos and animations, a self marking quiz on lipids and carbohydrates.
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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Resources for learning the immune system. Powerpoints, animations, videos, self marking test and some rare immune sytem questions.Read More
Multiple choice questions on enzymes, all past paper questions, a good way to assess your understandingRead More
Multiple choice questions on cell organelles, all past paper questions, a good way to assess your understandingRead More
Resources on viruses and prokaryotesRead More
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 phosphorylationRead More
Powerpoints and notes, a pack of long data analysis exam questions and a test on photosynthesis
Tips for Photosynthesis
LDR - occurs on the thylakoid membranes. Limiting factor is light intensity
Phosphorylates ADP (through chemiosmosis) - creates the Hydrogen ion gradient by the flow of electrons along the ETC in the thylakoid membrane. The flow of electrons is driven by the capturing of light by a range of different pigments which channel the energy to a chl a molecule at the reaction centre of the photosystem - which then loses an electron.
Reduces NADP with an electron from splitting water (photolysis) at PSII.
Light Independent Reaction (reduction of carbon dioxide) - occurs in the stroma (the cytoplasm of the chloroplast).
Limited by speed and quantity of RUBISCO enzyme (kinetic energy - temperature) and substrate concentration (Carbon dioxide)
Needs the products of the LDR - ATP and NADPH
NADPH and ATP are used to regenerate RUBP
Each time the Calvin cycle turns, a single Carbon is reduced. 3 turns - one extra Triose Phosphate. 6 turns - 2 extra TP = 1 extra glucose.
TP is the source of all of the carbon in all plants (and hence in all heterotrophes) - Amino acids, DNA, RNA, phospholipids etc
Cell membranes, osmosis, diffusion , active transport, - lots of experimental and application questionsRead More
Protein Synthesis - exam questions a quiz and powerpoints, videos and animations, please like and shareRead More
Oegenesis, Gametogenesis, Fertilization in HumansRead More
Excellent immunity resourcesRead More
Plant reproduction - videos questions and resources
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Homeostasis - Glucose and Temperature - for AQA and OCR
Question Pack, Videos, Powerpoints
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A-level Biology Questions by topic : Spirometer and Lung Volume Questions - powerpoints and Videos
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A-level Biology Questions on Kidney Dialysis and Transplants - useful powerpoints/animations and videos
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Enzymes - Questions (and answers) - for A-level Biology - With Videos and Powerpoints to help recap the theory.
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A guide to aerobic and anaerobic respiration for A level Biology with plenty of exam questions on respiration with markschemes, for AQA, OCR, Edexcel
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Frequently students fail to learn the vocabulary of Biology. To get a top grade it is essential to know what the words mean in a Biological context (niche, chromosome, chromatid...), and have the confidence to use those words in an exam answer.Read More