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Cell Biology Β· AQA6 marks

Explain how the process of mitosis ensures that daughter cells are genetically identical to the parent cell.

During mitosis, the DNA is copied before the cell divides so each daughter cell gets the same DNA. The chromosomes line up in the middle and are pulled apart to opposite ends of the cell. This means both cells end up with the same number of chromosomes as the parent…
AI Examiner Feedback4 / 6
  • DNA replication (S phase): Awarded β€” correctly states DNA is copied before division.
  • Chromosome alignment: Awarded β€” chromosomes aligning at the metaphase plate.
  • Spindle fibres: Missed β€” no mention of spindle fibres pulling sister chromatids apart.
  • Cytokinesis: Missed β€” cell membrane pinching to produce two separate cells.
Subjects covered
Biology GCSEChemistry GCSEPhysics GCSEEnglish Literature GCSEMaths GCSEHistory GCSEGeography GCSEBiology A-LevelChemistry A-LevelEnglish Lit A-LevelBiology GCSEChemistry GCSEPhysics GCSEEnglish Literature GCSEMaths GCSEHistory GCSEGeography GCSEBiology A-LevelChemistry A-LevelEnglish Lit A-Level
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Biology GCSE Β· Paper 1 Β· Q5bMarked
Question (6 marks)
Describe and explain how the body responds to a rise in blood glucose concentration. [6 marks]
Student answer
β€œWhen blood glucose goes up, the pancreas releases insulin. Insulin makes cells take in glucose and converts it to glycogen in the liver. This brings blood glucose back down to normal.”
AI Examiner4 / 6
  • Pancreas detects rise: Awarded β€” pancreas correctly identified as detector organ.
  • Insulin released: Awarded β€” correct hormone named.
  • Cells absorb glucose: Awarded β€” effect of insulin on body cells stated.
  • Glycogen storage in liver: Awarded β€” glucoseβ†’glycogen conversion mentioned.
  • Beta cells: Missed β€” should specify that beta cells in the islets of Langerhans secrete insulin.
  • Negative feedback: Missed β€” no mention of the negative feedback mechanism maintaining homeostasis.
πŸ’‘ To get full marks: Name beta cells specifically, and explain this is negative feedback β€” the response (insulin) counteracts the original change (high glucose), restoring the set point.
8s
Average marking time
Β±1
Accuracy vs real examiner
2,000+
Exam questions
12
Subjects available
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Year 13, Chemistry A-Level

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Priya K.
Year 12, Biology A-Level
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