AQA GCSE Biology Paper 1 - Revision Questions
How is the real size of a magnified image calculated? - Correct Answers-Real size = Image size ÷
Total magnification.
What is a eukaryotic cell? - Correct Answers-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? - Correct Answers-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? - Correct Answers-Higher temperature, Steeper
concentration gradient, Shorter diffusion distance
Why are stem cells used in medicine? - Correct Answers-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? - Correct Answers-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? - Correct Answers-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)? - Correct Answers-Heated with
Benedict's reagent. A change in colour from blue to green, orange or brick-red are all positive
results.
What are the differences between veins and arteries? - Correct Answers-Arteries have a thicker
wall than veins. Arteries transport blood under higher pressure than veins. Veins have veins to
prevent backflow of blood, arteries do not.
In what ways are the alveoli adapted to their function? - Correct Answers-A thin wall, one cell
thick. A good blood supply to maintain concentration gradient. A large surface area. Moist
How is the real size of a magnified image calculated? - Correct Answers-Real size = Image size ÷
Total magnification.
What is a eukaryotic cell? - Correct Answers-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? - Correct Answers-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? - Correct Answers-Higher temperature, Steeper
concentration gradient, Shorter diffusion distance
Why are stem cells used in medicine? - Correct Answers-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? - Correct Answers-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? - Correct Answers-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)? - Correct Answers-Heated with
Benedict's reagent. A change in colour from blue to green, orange or brick-red are all positive
results.
What are the differences between veins and arteries? - Correct Answers-Arteries have a thicker
wall than veins. Arteries transport blood under higher pressure than veins. Veins have veins to
prevent backflow of blood, arteries do not.
In what ways are the alveoli adapted to their function? - Correct Answers-A thin wall, one cell
thick. A good blood supply to maintain concentration gradient. A large surface area. Moist
