GCSE Biology B4- OCR 21st century Science Printable revision cards

These revision cards should cover everything you need to know for the B4 OCR 21st Century Science syllabus. If you want to print them, you'll have to fold each card where the blue line in the middle is and glue it down. You can then use it to test yourself on the questions. I recommend going through the cards once before you revise and put the cards into two piles; Know, and Need to revise. Then go through and learn the cards in the Need to revise pile. I hope these are as useful for you as they were to me. Good luck! :)

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  • Created by: fay
  • Created on: 19-01-13 14:31

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Slide 1

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List the processes
What is What is
occurring in living
Respiration? photosynthesis
Movement Respiration is a Photosynthesis is
series of chemical a series of
reactions that chemical reactions
Sensitivity release energy by that use energy
Growth breaking down from sunlight to
large food build large food
Reproduction molecules in all molecules in plant
Excretion living cells. cells.
Nutrition…read more

Slide 2

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Photosynthesis word What is
Respiration word What is an enzyme?
and symbol equation. photosynthesis
and symbol
equation. ?
An enzyme is a protein that speeds
up a chemical reaction in a living
organism. It acts as a catalyst,
converting a special set of reactants
called substrates, into specific
products.…read more

Slide 3

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What is an What is an
WhatWhat is a
is an enzyme?
substrate? active site? active site?
A substrate An active site is An active site
is a molecule a region on an is a region on an
upon which an enzyme that enzyme that
binds to a protein binds to a
enzyme acts. protein or other
This binds to or other
the active site substance during during a
of the a reaction. reaction.
enzyme.…read more

Slide 4

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How do cold How do very hot What is the lock
What is an enzyme?
temperatures temperatures and key
affect enzymes? affect enzymes? hypothesis?
The lock and key hypothesis/model
In cold temperatures When the enzyme is in
explains how just as a lock only
the molecules have very warm temperatures (0
degrees - 37 degrees) accepts one key, an enzyme can only
very low kinetic energy catalyze one substrate. Both the key
enzyme reactivity increases
so there are not many steadily, however if the and lock must be the correct shape to
collisions, meaning temperature is hotter than bind in order to unlock something, as
that reactions are also 37 degrees reactivity rate must the substrate molecules and the
active site be the right shape in order
weak. then decreases rapidly.
to catalyze successfully.…read more

Slide 5

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What is the What is What is the
What optimum
is an enzyme?
Denaturation? function of the
temperature for cell wall?
The optimum Denaturation is the unfolding of Cell wall: Extra protein around the
temperature, the the protein in a way that affects its cell membrane to keep the shape of
temperature at
ability to function. Enzymes can be the cell.
which an enzyme
produces the denatured by high temperatures and
highest reactivity extremes of pH. When an enzyme is
rate, for an denatured, the shape of the active
enzyme is 37 site of the enzyme is changed and
degrees. therefore affects its ability to
function.…read more

Slide 6

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What is the What is the What is the
What is an enzyme?
function of the function of the function of the
chloroplast? vacuole? cytoplasm?
Chloroplasts: contain chlorophyll to Vacuole: Cytoplasm: Where enzymes are
absorb sunlight and enzymes for the Storage area made- used in anaerobic respiration
reactions in photosynthesis for starch…read more

Slide 7

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Slide 8

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Slide 9

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Slide 10

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Kayleigh <3


These are great thanks :)

lisa linsdell


A nice set of revision cards for this module for OCR 21st Century Science. Covers all the basics of the unit. 



Very nice



Very nice!



these are amazing!!!!



not enough detail 

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