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AQA GCSE Biology
AQA A level Biology Revision Questions and Answers
[Meer zien]AQA A level Biology Revision Questions and Answers
[Meer zien]Tough supporting wall of the eye - Sclera 
Transparent outer layer found at the front of the eye. Refracts (bends) light into the eye - Cornea 
Contains muscles that allow it to control the diameter of the Pupil (hole in the middle) and therefore 
how much light enters the eye - Iris 
Focuses light ...
Voorbeeld 1 van de 2 pagina's
In winkelwagenTough supporting wall of the eye - Sclera 
Transparent outer layer found at the front of the eye. Refracts (bends) light into the eye - Cornea 
Contains muscles that allow it to control the diameter of the Pupil (hole in the middle) and therefore 
how much light enters the eye - Iris 
Focuses light ...
What are the structures of an animal cell? - Nucleus, cytoplasm, cell membrane, mitochondria 
and ribosomes. 
What are the structures of a plant cell? - All structures from animal cells and cell wall, permanent 
vacuole and chloroplasts. 
What does the nucleus do? - Stores DNA and directs all cellul...
Voorbeeld 2 van de 15 pagina's
In winkelwagenWhat are the structures of an animal cell? - Nucleus, cytoplasm, cell membrane, mitochondria 
and ribosomes. 
What are the structures of a plant cell? - All structures from animal cells and cell wall, permanent 
vacuole and chloroplasts. 
What does the nucleus do? - Stores DNA and directs all cellul...
What are the structures of an animal cell? - Nucleus, cytoplasm, cell membrane, mitochondria 
and ribosomes. 
What are the structures of a plant cell? - All structures from animal cells and cell wall, permanent 
vacuole and chloroplasts. 
What does the nucleus do? - Stores DNA and directs all cellul...
Voorbeeld 2 van de 15 pagina's
In winkelwagenWhat are the structures of an animal cell? - Nucleus, cytoplasm, cell membrane, mitochondria 
and ribosomes. 
What are the structures of a plant cell? - All structures from animal cells and cell wall, permanent 
vacuole and chloroplasts. 
What does the nucleus do? - Stores DNA and directs all cellul...
What are eukaryotic cells? - Cells that are more complex and have a nucleus (animal and plant cells) 
What are prokaryotic cells? - Cells that are smaller and simpler, and don't have a nucleus but still 
have genetic information (bacteria) 
What are eukaryotes? - Organisms made of eukaryotic cells ...
Voorbeeld 4 van de 48 pagina's
In winkelwagenWhat are eukaryotic cells? - Cells that are more complex and have a nucleus (animal and plant cells) 
What are prokaryotic cells? - Cells that are smaller and simpler, and don't have a nucleus but still 
have genetic information (bacteria) 
What are eukaryotes? - Organisms made of eukaryotic cells ...
What does a nucleus do? - It contains genetic material and controls the activities of the cell 
What does cytoplasm do? - It's a gel-like substance where most of the chemical reactions 
happen. It contains enzymes that control these chemical reactions 
What does a cell membrane do? - It holds the c...
Voorbeeld 4 van de 37 pagina's
In winkelwagenWhat does a nucleus do? - It contains genetic material and controls the activities of the cell 
What does cytoplasm do? - It's a gel-like substance where most of the chemical reactions 
happen. It contains enzymes that control these chemical reactions 
What does a cell membrane do? - It holds the c...
What is homeostasis? - The maintenance of a constant internal environment. 
What is a stimulus? - A change in your environment than requires a response. e.g Light, sound, 
touch, pressure, pain, chemical or temperature. 
What do the receptors do? - Detect the stimulus or change in environment. 
What...
Voorbeeld 4 van de 37 pagina's
In winkelwagenWhat is homeostasis? - The maintenance of a constant internal environment. 
What is a stimulus? - A change in your environment than requires a response. e.g Light, sound, 
touch, pressure, pain, chemical or temperature. 
What do the receptors do? - Detect the stimulus or change in environment. 
What...
How is the real size of a magnified image calculated? - Real size = Image size ÷ Total 
magnification. 
What is a eukaryotic cell? - A cell with DNA inside a membrane bound nucleus. Prokaryotic cells 
do not have a nucleus. 
Name two differences between a plant cell and a bacterial cell? - Plant ce...
Voorbeeld 1 van de 3 pagina's
In winkelwagenHow is the real size of a magnified image calculated? - Real size = Image size ÷ Total 
magnification. 
What is a eukaryotic cell? - A cell with DNA inside a membrane bound nucleus. Prokaryotic cells 
do not have a nucleus. 
Name two differences between a plant cell and a bacterial cell? - Plant ce...
How is the real size of a magnified image calculated? - Real size = Image size ÷ Total 
magnification. 
What is a eukaryotic cell? - A cell with DNA inside a membrane bound nucleus. Prokaryotic cells 
do not have a nucleus. 
Name two differences between a plant cell and a bacterial cell? - Plant ce...
Voorbeeld 1 van de 3 pagina's
In winkelwagenHow is the real size of a magnified image calculated? - Real size = Image size ÷ Total 
magnification. 
What is a eukaryotic cell? - A cell with DNA inside a membrane bound nucleus. Prokaryotic cells 
do not have a nucleus. 
Name two differences between a plant cell and a bacterial cell? - Plant ce...
What are cells? - The building blocks of organisms 
Define eukaryotic cell - Cells that have a true nucleus 
Define prokaryotic cell - Cells that do not have a true nucleus 
What is in an animal cell? - Nucleus, cytoplasm, cell membrane, mitochondria, ribosomes 
What is in a plant cell? - Same as an...
Voorbeeld 2 van de 6 pagina's
In winkelwagenWhat are cells? - The building blocks of organisms 
Define eukaryotic cell - Cells that have a true nucleus 
Define prokaryotic cell - Cells that do not have a true nucleus 
What is in an animal cell? - Nucleus, cytoplasm, cell membrane, mitochondria, ribosomes 
What is in a plant cell? - Same as an...
describe and explain the steps in the light dependent reaction of photosynthesis - 1. 
photoionisation: light reaches chlorophyll in PSII, which is absorbed by an electron, which becomes 
excited and moves to a higher energy level. 
2. the electron passes to a carrier protein in the thylakoid membra...
Voorbeeld 3 van de 20 pagina's
In winkelwagendescribe and explain the steps in the light dependent reaction of photosynthesis - 1. 
photoionisation: light reaches chlorophyll in PSII, which is absorbed by an electron, which becomes 
excited and moves to a higher energy level. 
2. the electron passes to a carrier protein in the thylakoid membra...
large molecules often contain carbon. why? - they can readily form bonds with other carbon 
atoms. this forms a 'backbone'. other atoms can then attach. 
describe benedicts test for reducing sugars - add equal volumes of the sugar sample and 
benedicts reagent. 
heat the mixture in a water bath fo...
Voorbeeld 3 van de 23 pagina's
In winkelwagenlarge molecules often contain carbon. why? - they can readily form bonds with other carbon 
atoms. this forms a 'backbone'. other atoms can then attach. 
describe benedicts test for reducing sugars - add equal volumes of the sugar sample and 
benedicts reagent. 
heat the mixture in a water bath fo...
Describe how you would use a biochemical test to show that a solution contained a non-reducing sugar, 
such as sucrose. [3] - ,first reducing sugars test; boil with dilute HCl acid then Neutralise with 
NaHCǑ, add benedict and heat to 95 degrees C brick red ppt forms if reducing sugar is present 
D...
Voorbeeld 4 van de 82 pagina's
In winkelwagenDescribe how you would use a biochemical test to show that a solution contained a non-reducing sugar, 
such as sucrose. [3] - ,first reducing sugars test; boil with dilute HCl acid then Neutralise with 
NaHCǑ, add benedict and heat to 95 degrees C brick red ppt forms if reducing sugar is present 
D...
What are chromosomes? - They are really long molecules of DNA 
What does DNA stand for - DeoxyribonNucleicAcid. It is a complex chemical in a thread-like chain. It 
contains coded information and genetic information 
Where is DNA found - It is found in the nucleus of animal and plant cells in long s...
Voorbeeld 2 van de 13 pagina's
In winkelwagenWhat are chromosomes? - They are really long molecules of DNA 
What does DNA stand for - DeoxyribonNucleicAcid. It is a complex chemical in a thread-like chain. It 
contains coded information and genetic information 
Where is DNA found - It is found in the nucleus of animal and plant cells in long s...
What are the two types of microscopes? - Light Microscope 
Electron Microscope 
What is the magnifying power of a light microscope? - x 2,000 
What is the magnifying power of an electron microscope? - x 2,000,000 
What is the resolving power? - The ability to distinguish between two separate points ...
Voorbeeld 4 van de 35 pagina's
In winkelwagenWhat are the two types of microscopes? - Light Microscope 
Electron Microscope 
What is the magnifying power of a light microscope? - x 2,000 
What is the magnifying power of an electron microscope? - x 2,000,000 
What is the resolving power? - The ability to distinguish between two separate points ...
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