GCSE BIOLOGY AQA EXAM REVISION QUESTIONS WITH VERIFIED SOLUTIONS LATEST 2025 UPDATE.

GCSE BIOLOGY AQA EXAM REVISION QUESTIONS WITH VERIFIED
SOLUTIONS LATEST 2025 UPDATE.




In which type of cell would you find a cell wall, chloroplasts and a vacuole? - ANSWER- plant
cell


What does an animal cell have? - ANSWER- - cytoplasm
- nucleus
- ribosomes
- cell membrane
- mitochondria


What does the nucleus do? - ANSWER- contains genetic material that controls the activities of
the cell


What is the cytoplasm? - ANSWER- gel-like substance where most of the chemical reactions
happen. It contains enzymes which control these chemical reactions


What is the cell membrane - ANSWER- holds the cell together and controls what goes in and
out


What happens in the mitochondria? - ANSWER- these are where most of the reactions for
respiration take place. Respiration releases energy that the cell needs to work


What happens in the ribosomes? - ANSWER- these are where proteins are made in the cell



What does a bacterial cell NOT have? - ANSWER- a nucleus- genetic material floats in the
cytoplasm

,What is a yeast cell an example of? - ANSWER- a single cell organism



What does a yeast cell have? - ANSWER- - nucleus
- cytoplasm
- cell membrane
- surrounding cell wall


How is a leaf cell different from a yeast cell? - ANSWER- leaf cells have chloroplasts and a
cellulose cell wall. yeast cells have neither


What is the definition of diffusion? - ANSWER- the SPREADING OUT of PARTICLES from
an area of HIGH CONCENTRATION to an area of LOW CONCENTRATION
or
the NET MOVEMENT of PARTICLES down a CONCENTRATION GRADIENT


What substances can diffuse through cell membranes? - ANSWER- small molecules like
oxygen, glucose, amino acids and water


What substances can't diffuse through cell membranes? - ANSWER- big molecules like starch
and proteins


What are some examples of diffusion? - ANSWER- - the diffusion of oxygen into the cells of
the body from the bloodstream as the cells are respiring (and using up oxygen)


- the diffusion of carbon dioxide into actively photosynthesising plant cells


- the diffusion of simple sugars and amino acids for the gut through cell membranes

, When, and in which direction, will diffusion take place in solutions and in gases? - ANSWER-
- if two solutions are separated by a cell membrane, particles will move from a region of high
concentration to a region of low concentration


- gases will also diffuse through the air from a region of high concentration to a region of low
concentration


How is a leaf cell adapted to carry out photosynthesis? - ANSWER- - the leaf has mesophyll
tissue
- the mesophyll cells contain chloroplasts which can photosynthesise


How are palisade cells adapted for photosynthesis? - ANSWER- - packed will chloroplasts for
photosynthesis
- tall shape means a lot of surface area exposed down the side for absorbing carbon dioxide from
the air in the leaf
- they are grouped together at the top of the leaf so that they can absorb more sunlight


How are red blood cells adapted to carry oxygen? - ANSWER- - concave shape gives a big
surface area for absorbing oxygen. it also helps them pass smoothly through capillaries to reach
body cells
- packed with haemoglobin which absorbs oxygen
- they have no nucleus to leave even more room for haemoglobin


How are sperm cells adapted for swimming to the egg? - ANSWER- - streamlined head and
flagella to help it swim to the egg
- there are a lot of mitochondria in the cell to provide the energy needed
- carry enzymes in their heads to digest through the egg cell membrane


If a cell has many mitochondria... - ANSWER- it must need a lot of energy, e.g. muscle cell,
sperm cell