OCR June 2018 AS Breadth in biology Multiple Choice Questions - Quiz and Guide

Practising recall is so important for retention and learning. Try this quiz without books first !

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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Try the self marking quiz below - and remember to like and share

Nerves and Synapses - Resources, videos, exam questions

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Immune System - Resources to help you improve and test your understanding

Immune system resources, powerpoints, animations, exam questions and self marking quiz.

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Organelles - Test your understanding

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Viruses and Prokaryotes - resources

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Photosynthesis Tips - Notes, videos, powerpoints and a pack of long questions

Powerpoints and notes, a pack of long data analysis exam questions and a test on photosynthesis

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Tips for Photosynthesis

Light Dependent Reactions - 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

How things cross membranes - resources and exam questions (lots of application and data analysis)

How things cross membranes - lots of data analysis and experiment questions.

Diffusion, Active Transport, Osmosis and Facilitated Diffusion.

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TIPS

• Can you explain how the phospholipid bilayer stops the diffusion of water soluble compounds ?

• Water potential is measured in kPA - a unit of pressure. So water moves to a lower water potential.

• Can you define water potential ?

• Facilitated means helped or assisted

• the cellulose cell wall is permeable - but resists the expansion of the cytoplasm, therefore preventing osmotic lysis

• Diffusion is moving from where there are lots to where there are few. Moving the opposite way needs energy

Protein Synthesis - Resources, Questions and a Quiz

Videos, powerpoints, animation and notes for understanding protein synthesis in A level Biology. A pack of questions and an automarked quiz.

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Tips for Understanding Protein Synthesis

DO

• Distinguish between Triplet, Codon, Anticodon

• Know what RNA polymerase does

• Understand how tRNA achieves translation

• Mention ATP and what it is used for

• remember that rRNA is made in the nucleolus

• Refer to START and STOP codons

DONT

• Say DNA is turned into mRNA

• Say Thymine becomes Uracil

• Say Amino acids are “joined together”

Here are lots of other excellent resources to help you improve

You could join other motivated U6th students in the group tutor sessions - twice a month

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OCR June 2017 AS Breadth in biology H020/01 Multiple Choice Questions - self marking quiz

Plant transport Questions - Xylem/Phloem

Transport in Plants questions from OCR

Transport in plant slides from Alex Chiam

If you found it useful then please ❤️ (at the bottom of the page) and share, you can follow me on instagram - alevelbiologytutor

Tuesday night group tutoring topics and Y13 & Y12 OCR A and AQA small group weekly class information

OCR A June 2017 Biological diversity (H420/02) - Self Marking Quiz

OCR A June 2017 Unified Biology 420/03 Guide to the Paper

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

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Stream a video guide to all of the OCR June 2017 Papers to see how you can improve your approach

My video guides to this and other OCR papers

OCR A June 2017 Biological Processes 420/01 Guide to the Paper

Practising recall is so important for retention and learning. Try this quiz without books first !

Try this quiz - if you found it useful then please ❤️ (at the bottom of the page) and share, you can follow me on instagram - alevelbiologytutor

Tuesday night group tutoring topics and Y13 & Y12 OCR A and AQA small group information

You can subscribe monthly to over 60 hours of recorded lessons

Answering Questions with lots of Maths in Biology - Data Analysis Questions in the new OCR Biology A Specification - updated Feb 2018 with the latest handbook

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.

42 pages with markschemes - have a look at the pdf

Also have a look at this guidance  on tables and graphs

And the mathematical skills for OCR guidebook

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OCR A - Guides to the A level Biology Exam Papers from alevelbiologytutor on Vimeo.

Challenging Questions with lots of Data Analysis and Application - A-level Biology past paper questions

Have a go at some of these - markschemes at the end

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Osmosis A-level Biology Past Paper Exam Questions

Osmosis questions - mainly focusing on calculations of water potential. I have tried to include one question of each type.

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How to do Tables and Graphs - terrific guidance from Exam Boards for A-level Biology

Rather than being assessed seperately, practical skills are included in the theory paper. Like this OCR question from the sample paper

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

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

Here are 20 multiple choice questions from the OCR specimen paper. Surprisingly difficult and caused a lot of debate in class. PDF - here

Splat and Flash..... ATP and Fireflies - #OCR Synoptic Biology A-level

Another from the past.

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

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Here is a pdf copy of the question - and of the markscheme.

Additionally, below are images with the markscheme answers edited in