Exam (elaborations)
OCR 2024 GCSE Biology B Twenty First Century Science J257/02: Depth in Biology (Foundation Tier)
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OCR 2024 GCSE Biology B Twenty First Century Science J257/02: Depth in Biology (Foundation Tier)
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Oxford Cambridge and RSAGCSE (9–1) Biology B (Twenty First Century
INFORMATION
• The total mark for this paper is 90.
• The marks for each question are shown in brackets [ ].
• Quality of extended response will be assessed in questions marked with an asterisk (*).
• This document has 20 pages.
ADVICE
• Read each question carefully before you start your answer.
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Turn over
, 2
1 Some types of bacteria can make us unwell.
(a) Here is a diagram of three cells.
Cell A Cell B Cell C
Mitochondria Cell wall
Nucleus Loop of DNA
containing DNA in the cytoplasm
Which cell is a bacteria cell?
Tick (✓) one box.
A
B
C
Use the diagram to explain your answer.
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© OCR 2024
, 3
(b) Light microscopes can be used to observe bacteria.
Here is a labelled diagram of a light microscope:
Eyepiece lens
Objective lens
Stage
Focus
Light
Complete the sentences to describe how to use the microscope to observe bacteria on a slide.
Use words from the labelled microscope.
Place the slide on the .................................................... .
Turn on the ....................................................so the image is as bright as possible.
Turn the .................................................... into position above the slide.
Adjust the .................................................... until the image is as clear as possible.
[4]
(c) Which of these infections is caused by bacteria?
Tick (✓) one box.
Athlete‟s foot
Influenza
Malaria
Salmonella food poisoning
[1]
© OCR 2024 Turn over
, 4
(d) Explain why washing your hands before making a sandwich can help stop you from getting
unwell.
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© OCR 2024
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