Mark Scheme (Results)
2025 Predicted Paper
Pearson Edexcel Level 3 GCE
Edexcel AS Biology Marking Scheme 2B 2025 Predicted
PAPER 2 Advanced Subsidiary
1
, Edexcel AS Biology Marking Scheme 2A 2025 Predicted
General Marking Guidance
• All candidates must receive the same treatment. Examiners must mark the
first candidate in exactly the same way as they mark the last.
• Mark schemes should be applied positively. Candidates must be rewarded
for what they have shown they can do rather than penalised for omissions.
• Examiners should mark according to the mark scheme not according to their
perception of where the grade boundaries may lie.
• There is no ceiling on achievement. All marks on the mark scheme should be
used appropriately.
• All the marks on the mark scheme are designed to be awarded. Examiners
should always award full marks if deserved, i.e. if the answer matches the
mark scheme. Examiners should also be prepared to award zero marks if the
candidate’s response is not worthy of credit according to the mark scheme.
• Where some judgement is required, mark schemes will provide the principles
by which marks will be awarded and exemplification may be limited.
• When examiners are in doubt regarding the application of the mark scheme
to a candidate’s response, the team leader must be consulted.
• Crossed out work should be marked UNLESS the candidate has replaced it
with an alternative response.
2
,Edexcel AS Biology Marking Scheme 2A 2025 Predicted
3
, Edexcel AS Biology Marking Scheme 2A 2025 Predicted
Comprehensive Marking Scheme
Question 1
(a) Which organelle is primarily responsible for producing ATP in cells?
Answer: C) Mitochondrion
Marks: 1
Explanation:
1. Why this is asked?
This is a fundamental biology question aimed at testing knowledge of cell
structure and function. From 2015–2023, similar questions often focus on
specific organelles, their roles, or their significance in energy metabolism.
2. Pattern of such questions:
o Frequently found in introductory cell biology sections.
o Topics may include organelle identification, functions, and processes
like respiration or protein synthesis.
o Usually framed as multiple-choice or short-answer questions.
3. How to approach this question?
o Identify the keywords: "producing ATP" (implies energy production).
o Recall that ATP is synthesized through cellular respiration in
mitochondria.
o Eliminate distractors:
▪ A) Nucleus - Controls genetic information, not ATP production.
▪ B) Ribosome - Protein synthesis.
▪ D) Golgi apparatus - Protein modification and transport.
4. Required theory:
o ATP is the primary energy currency of the cell.
o Mitochondria are the site of aerobic respiration, generating ATP via the
electron transport chain.
Mark Scheme:
• 1 mark: Correct identification of "Mitochondrion."
• Explanation for answer: ATP synthesis occurs in the mitochondria during
oxidative phosphorylation, a key step in cellular respiration.
TLDR: Mitochondria = powerhouse of the cell = ATP production.
4
2025 Predicted Paper
Pearson Edexcel Level 3 GCE
Edexcel AS Biology Marking Scheme 2B 2025 Predicted
PAPER 2 Advanced Subsidiary
1
, Edexcel AS Biology Marking Scheme 2A 2025 Predicted
General Marking Guidance
• All candidates must receive the same treatment. Examiners must mark the
first candidate in exactly the same way as they mark the last.
• Mark schemes should be applied positively. Candidates must be rewarded
for what they have shown they can do rather than penalised for omissions.
• Examiners should mark according to the mark scheme not according to their
perception of where the grade boundaries may lie.
• There is no ceiling on achievement. All marks on the mark scheme should be
used appropriately.
• All the marks on the mark scheme are designed to be awarded. Examiners
should always award full marks if deserved, i.e. if the answer matches the
mark scheme. Examiners should also be prepared to award zero marks if the
candidate’s response is not worthy of credit according to the mark scheme.
• Where some judgement is required, mark schemes will provide the principles
by which marks will be awarded and exemplification may be limited.
• When examiners are in doubt regarding the application of the mark scheme
to a candidate’s response, the team leader must be consulted.
• Crossed out work should be marked UNLESS the candidate has replaced it
with an alternative response.
2
,Edexcel AS Biology Marking Scheme 2A 2025 Predicted
3
, Edexcel AS Biology Marking Scheme 2A 2025 Predicted
Comprehensive Marking Scheme
Question 1
(a) Which organelle is primarily responsible for producing ATP in cells?
Answer: C) Mitochondrion
Marks: 1
Explanation:
1. Why this is asked?
This is a fundamental biology question aimed at testing knowledge of cell
structure and function. From 2015–2023, similar questions often focus on
specific organelles, their roles, or their significance in energy metabolism.
2. Pattern of such questions:
o Frequently found in introductory cell biology sections.
o Topics may include organelle identification, functions, and processes
like respiration or protein synthesis.
o Usually framed as multiple-choice or short-answer questions.
3. How to approach this question?
o Identify the keywords: "producing ATP" (implies energy production).
o Recall that ATP is synthesized through cellular respiration in
mitochondria.
o Eliminate distractors:
▪ A) Nucleus - Controls genetic information, not ATP production.
▪ B) Ribosome - Protein synthesis.
▪ D) Golgi apparatus - Protein modification and transport.
4. Required theory:
o ATP is the primary energy currency of the cell.
o Mitochondria are the site of aerobic respiration, generating ATP via the
electron transport chain.
Mark Scheme:
• 1 mark: Correct identification of "Mitochondrion."
• Explanation for answer: ATP synthesis occurs in the mitochondria during
oxidative phosphorylation, a key step in cellular respiration.
TLDR: Mitochondria = powerhouse of the cell = ATP production.
4
