•• Use Fill in the boxescentre number and candidate number.black ink or
ball-point pen. at the top of this page with your name,
•• Answer Answer the questions in the spaces provided – there may be more space than you
needall questions. .
Information
•• The total mark for this paper is 120.The marks for – use this as a guide as to how much time to
spend on each questioneach question are shown in brackets .
, • structure your answer logically showing how the points that you make are related or In
question(s) marked with an asterisk (*), marks will be awarded for your ability to follow on
from each other where appropriate.
Advice
••• Read each question carefully before you start to answer it.Try to
answer every question.Check your answers if you have time at the end.
Turn over
P74462A
©2025 Pearson Education Ltd. *P74462A0144*
Y:1/1/1/1/1/1/1/1/1/
Answer ALL questions.
Write your answers in the spaces provided.
1 Saccharomyces cerevisiae (yeast) is a single-celled organism widely used in brewing and
baking.
The diagram shows a drawing of a yeast cell, as seen using an electron microscope.
2
, B
(a) The actual size of the cell measured from point A to point B is 6 µm.
Calculate the magnification of this yeast cell.
Give your answer to the nearest whole number.
(2)
Answer ..............................................................
*P74462A0244*
(b) Draw this yeast cell as it would be seen using a light microscope at high
magnification.
Labels are not required.
3
Turn over
, (2)
(c) The information in the diagram can be used to classify yeast.
(i) State why yeast is classified as eukaryotic not prokaryotic.
(1)
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
(ii) State why yeast is not classified as a plant.
(1)
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
(Total for Question 1 = 6 marks)
4
•• Use Fill in the boxescentre number and candidate number.black ink or
ball-point pen. at the top of this page with your name,
•• Answer Answer the questions in the spaces provided – there may be more space than you
needall questions. .
Information
•• The total mark for this paper is 120.The marks for – use this as a guide as to how much time to
spend on each questioneach question are shown in brackets .
, • structure your answer logically showing how the points that you make are related or In
question(s) marked with an asterisk (*), marks will be awarded for your ability to follow on
from each other where appropriate.
Advice
••• Read each question carefully before you start to answer it.Try to
answer every question.Check your answers if you have time at the end.
Turn over
P74462A
©2025 Pearson Education Ltd. *P74462A0144*
Y:1/1/1/1/1/1/1/1/1/
Answer ALL questions.
Write your answers in the spaces provided.
1 Saccharomyces cerevisiae (yeast) is a single-celled organism widely used in brewing and
baking.
The diagram shows a drawing of a yeast cell, as seen using an electron microscope.
2
, B
(a) The actual size of the cell measured from point A to point B is 6 µm.
Calculate the magnification of this yeast cell.
Give your answer to the nearest whole number.
(2)
Answer ..............................................................
*P74462A0244*
(b) Draw this yeast cell as it would be seen using a light microscope at high
magnification.
Labels are not required.
3
Turn over
, (2)
(c) The information in the diagram can be used to classify yeast.
(i) State why yeast is classified as eukaryotic not prokaryotic.
(1)
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
(ii) State why yeast is not classified as a plant.
(1)
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
....................................................................................................................................................................................................................................................................................
(Total for Question 1 = 6 marks)
4
