GCSE Biology Paper 1 - Revision
Questions(AQA) Exam And Accurate
Answers.
How is the real size of a magnified image calculated? - Answer Real size = Image size ÷ Total
magnification.
What is a eukaryotic cell? - Answer 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? - Answer 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 not in a
nucleus and have DNA plasmids whereas plant cells do not contain these structures.
How can the rate of diffusion be increased? - Answer Higher temperature, Steeper concentration
gradient, Shorter diffusion distance
Why are stem cells used in medicine? - Answer 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? - Answer 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? - Answer The active site changes shape and can no
longer bind with the substrate. The enzyme will no longer function
What is the test for a reducing sugar (such as glucose)? - Answer Heated with Benedict's reagent. A
change in colour from blue to green, orange or brick-red are all positive results.
Questions(AQA) Exam And Accurate
Answers.
How is the real size of a magnified image calculated? - Answer Real size = Image size ÷ Total
magnification.
What is a eukaryotic cell? - Answer 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? - Answer 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 not in a
nucleus and have DNA plasmids whereas plant cells do not contain these structures.
How can the rate of diffusion be increased? - Answer Higher temperature, Steeper concentration
gradient, Shorter diffusion distance
Why are stem cells used in medicine? - Answer 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? - Answer 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? - Answer The active site changes shape and can no
longer bind with the substrate. The enzyme will no longer function
What is the test for a reducing sugar (such as glucose)? - Answer Heated with Benedict's reagent. A
change in colour from blue to green, orange or brick-red are all positive results.
