AQA GCSE Biology Paper 1 Exam -
Revision Questions and Answers 100%
Pass
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 cells have a nucleus / plant cells have
mitochondria / plant cells have chloroplasts / plant cells
have a cellulose cell wall whereas bacteria do not contain
any of these structures. Bacteria have chromosomal DNA
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, not in a nucleus and have DNA plasmids whereas plant
cells do not contain these structures.
How can the rate of diffusion be increased? - ✔✔Higher
temperature, Steeper concentration gradient, Shorter
diffusion distance
Why are stem cells used in medicine? - ✔✔Treatment with
stem cells may be able to help conditions such as
diabetes and paralysis.
What is the lock and key model of enzyme action? -
✔✔The active site of an enzyme is a specific shape, which
is complimentary to its substrate - they fit together like a
lock and key to form an enzyme-substrate complex.
What happens when an enzyme is denatured? - ✔✔The
active site changes shape and can no longer bind with the
substrate. The enzyme will no longer function
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
Revision Questions and Answers 100%
Pass
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 cells have a nucleus / plant cells have
mitochondria / plant cells have chloroplasts / plant cells
have a cellulose cell wall whereas bacteria do not contain
any of these structures. Bacteria have chromosomal DNA
1
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
, not in a nucleus and have DNA plasmids whereas plant
cells do not contain these structures.
How can the rate of diffusion be increased? - ✔✔Higher
temperature, Steeper concentration gradient, Shorter
diffusion distance
Why are stem cells used in medicine? - ✔✔Treatment with
stem cells may be able to help conditions such as
diabetes and paralysis.
What is the lock and key model of enzyme action? -
✔✔The active site of an enzyme is a specific shape, which
is complimentary to its substrate - they fit together like a
lock and key to form an enzyme-substrate complex.
What happens when an enzyme is denatured? - ✔✔The
active site changes shape and can no longer bind with the
substrate. The enzyme will no longer function
2
©JOSHCLAY 2024/2025. YEAR PUBLISHED 2024.
