Exam (elaborations)
#O C R J257/03 Breadth in biology (Higher Tier) GCSE (9–1) Biology B (Twenty First Century Science) May 2023
#O C R J257/03 Breadth in biology (Higher Tier) GCSE (9–1) Biology B (Twenty First Century Science) May 2023
[Show more]
Seller
Follow
Content preview
#O C RJ257/03 Breadth in biology (Higher Tier)
GCSE (9–1) Biology B
(Twenty First Century Science)
May 2023
H
Time allowed: 1 hour 45 minutes
You must have:
a ruler (cm/mm)
You can use:
an HB pencil
a scientific or graphical calculator
Please write clearly in black ink. Do not write in the barcodes.
Centre number Candidate number
First name(s)
Last name
INSTRUCTIONS
• Use black ink. You can use an HB pencil, but only for graphs and diagrams.
• Write your answer to each question in the space provided. If you need extra space use
the lined pages at the end of this booklet. The question numbers must be clearly shown.
• Answer all the questions.
• Where appropriate, your answer should be supported with working. Marks might be
given for using a correct method, even if your answer is wrong.
INFORMATION
• The total mark for this paper is 90.
• The marks for each question are shown in brackets [ ].
• This document has 24 pages.
ADVICE
• Read each question carefully before you start your answer.
,2023 Turn over
, 2
1 (a) (i) Complete the table to compare cellular aerobic and anaerobic respiration in humans.
Tick (✓) the correct boxes in each row.
It requires It requires It produces It produces It produces
Process
glucose oxygen carbon dioxide water lactic acid
Aerobic
respiration
Anaerobic
respiration
[3]
(ii) Which statement about respiration is correct?
Tick (✓) one box.
Aerobic respiration produces more ATP than anaerobic respiration.
Anaerobic respiration produces more ATP than aerobic respiration.
Both aerobic and anaerobic respiration produce the same amount of ATP.
Neither aerobic or anaerobic respiration produces ATP.
[1]
(b) Heart muscle contains approximately 5000 mitochondria in every cell.
(i) Suggest why heart muscle cells need so many mitochondria.
...........................................................................................................................................
...........................................................................................................................................
.................................................................................................................................... [2]
(ii) The image shows the mitochondria in a section of heart muscle. The mitochondria are
different sizes.
One of the mitochondria is labelled.
A mitochondria
Estimate the number of mitochondria in this image.
Number of mitochondria =...........................................................[1]
2023
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller JOY1ACADAMY. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £14.55. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75759 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now