AQA GCSE Combined Science Biology Complete Questions and Answers 2024/25
What do all cells have? - (answer)Nucleus, Cytoplasm, Cell Membrane, Mitochondria,
Ribosomes
What do only plant and algal cells have? - (answer)A Cellulose Cell Wall (sometimes
Chloroplasts and a Vacuole)
What do Eukaryotic Cells have? - (answer)Cell Membrane, Cytoplasm, Genetic Material
enclosed in a nucleus,
What are Prokaryotic Cells? - (answer)Cytoplasm and a cell membrane surrounded by a cell
wall. Genetic Material is not in a nucleus, but in a single DNA loop. May also contain plasmids.
E.g. Bacteria
What is Diffusion? - (answer)Diffusion is the spreading out of particles of any substance in a
solution or gas, resulting in a net movement from an area of higher concentration to an area of
lower concentration.
Give four examples of dissolved substances which move in and out of cells by diffusion -
(answer)Glucose, Urea, Oxygen, Carbon Dioxide.
What is Osmosis? - (answer)The movement of water from a dilute to a more concentrated solute
solution through a partially permeable membrane.
What is Active Transport? - (answer)The movement of substances from a more dilute solution to
a more concentrated solution. This uses energy from food in respiration.
What is a tissue? - (answer)A group of cells with a similar structure and function
What is an organ? - (answer)A collection of tissues performing a specific function.
, What is the Benedict's test for sugars? - (answer)They turn blue Benedict's solution brick red on
heating
What is the ethanol test for lipids? - (answer)Ethanol will go milky white in the presence of
lipids.
What is the Biuret test for Protein? - (answer)Biuret turns from blue to purple in the presence of
proteins.
What do Carbohydrases break down? - (answer)Carbohydrates to simple sugars.
What do Proteases break down? - (answer)Proteins to Amino Acids
What do Lipases break down? - (answer)Lipids to Fatty Acids and Glycerol
What is the function of Bile? - (answer)Bile is produced by the liver and stored in the gall
bladder and neutralises acid and emulsifies fats.
What is Plasma? - (answer)Plasma has blood cells suspended in it and transports proteins and
chemicals around the body.
What is Haemoglobin? - (answer)It binds to oxygen to transport it from the lungs to tissues.
What do white blood cells do? - (answer)Protect against infection?
What are platelets? - (answer)Cell fragments that start the clotting process at wounds.
What are the capillaries there for? - (answer)Substances diffuse in and out of the blood
What kind of circulatory system do humans have? - (answer)A double circulatory system
What do all cells have? - (answer)Nucleus, Cytoplasm, Cell Membrane, Mitochondria,
Ribosomes
What do only plant and algal cells have? - (answer)A Cellulose Cell Wall (sometimes
Chloroplasts and a Vacuole)
What do Eukaryotic Cells have? - (answer)Cell Membrane, Cytoplasm, Genetic Material
enclosed in a nucleus,
What are Prokaryotic Cells? - (answer)Cytoplasm and a cell membrane surrounded by a cell
wall. Genetic Material is not in a nucleus, but in a single DNA loop. May also contain plasmids.
E.g. Bacteria
What is Diffusion? - (answer)Diffusion is the spreading out of particles of any substance in a
solution or gas, resulting in a net movement from an area of higher concentration to an area of
lower concentration.
Give four examples of dissolved substances which move in and out of cells by diffusion -
(answer)Glucose, Urea, Oxygen, Carbon Dioxide.
What is Osmosis? - (answer)The movement of water from a dilute to a more concentrated solute
solution through a partially permeable membrane.
What is Active Transport? - (answer)The movement of substances from a more dilute solution to
a more concentrated solution. This uses energy from food in respiration.
What is a tissue? - (answer)A group of cells with a similar structure and function
What is an organ? - (answer)A collection of tissues performing a specific function.
, What is the Benedict's test for sugars? - (answer)They turn blue Benedict's solution brick red on
heating
What is the ethanol test for lipids? - (answer)Ethanol will go milky white in the presence of
lipids.
What is the Biuret test for Protein? - (answer)Biuret turns from blue to purple in the presence of
proteins.
What do Carbohydrases break down? - (answer)Carbohydrates to simple sugars.
What do Proteases break down? - (answer)Proteins to Amino Acids
What do Lipases break down? - (answer)Lipids to Fatty Acids and Glycerol
What is the function of Bile? - (answer)Bile is produced by the liver and stored in the gall
bladder and neutralises acid and emulsifies fats.
What is Plasma? - (answer)Plasma has blood cells suspended in it and transports proteins and
chemicals around the body.
What is Haemoglobin? - (answer)It binds to oxygen to transport it from the lungs to tissues.
What do white blood cells do? - (answer)Protect against infection?
What are platelets? - (answer)Cell fragments that start the clotting process at wounds.
What are the capillaries there for? - (answer)Substances diffuse in and out of the blood
What kind of circulatory system do humans have? - (answer)A double circulatory system
