Self marking quiz for the OCR AS Biology A H020/01 Breadth in biology paper

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

Resources for learning the immune system. Powerpoints, animations, videos, self marking test and some rare immune sytem questions.

Multiple choice questions on cell organelles, all past paper questions, a good way to assess your understanding

Resources on viruses and prokaryotes

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 questions

Protein Synthesis - exam questions a quiz and powerpoints, videos and animations, please like and share

AS OCR Breadth in biology H020/01 June 2017 Multiple Choice Questions as an auto-marking online quiz

Plant transport guide - videos, powerpoints, questions

OCR released the OCR A June 2017 H420 papers. I combined the Biological DIversity 420/02 paper with the markscheme to make it easier to follow and interpret.

OCR released the OCR A June 2017 H420 papers. I combined the Unified Biology 420/03 paper with the markscheme to make it easier to follow and interpret.

OCR released the OCR A June 2017 H420 papers. I combined the Biological Processes 420/01 paper with the markscheme to make it easier to follow and interpret.

Which maths skills you need to practise for the new specification A-level Biology - excellent resources from OCR - also applies to AQA and Eduqas, lots of great practice questions

The quantity of maths in the 2017 specification is a challenge to many students - so I put together a summary of all of the OCR A new spec questions with some element of data analysis.

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Good practice if you are struggling with data analysis questions

Pack of challenging past paper questions with lots of Data Analysis and application - A-level Biology past paper questions - good for OCR and AQA specifications

Pack of past paper questions on Osmosis and Water potential - I have tried to include one question of each type

There is plenty of excellent guidance on how to plot graphs and draw tables in the OCR practical booklet  ..... pdf

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Prompting some festive recapping ? - Looking back at first year A-level Biology topics

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Another from the past.

Terrific question about DNA, diffusion, ATP production and fireflies going out in a blaze of glory....

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