OCR A Level Biology A
OCR A Level Biology A Cell Structure Exam Questions
Free OCR A Level Biology A exam questions on Cell Structure, with mark schemes. Covers microscopy, magnification, eukaryotic and prokaryotic cell ultrastructure and the cytoskeleton.
Cell Structure exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Biology A H420 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Biology A Cell Structure
This topic covers how cells are studied and what they are made of.
What you need to know
- Microscopy Light, transmission and scanning electron microscopes; resolution and magnification.
- Staining and calibration Using stains, eyepiece graticules and stage micrometers.
- Organelles Structure and function of the nucleus, ER, Golgi, mitochondria, chloroplasts and ribosomes.
- Prokaryotes 70S ribosomes, circular DNA, plasmids and no membrane-bound organelles.
Common mistakes in Cell Structure
- Confusing resolution with magnification.
- Forgetting to convert units when calculating magnification.
- Saying prokaryotes have no ribosomes.
Try three Cell Structure exam-style questions
1. An image is 25 mm long and the real object is 5 μm. Find the magnification. (1 mark)
Show the mark scheme answer
x5000.
2. Explain why electron microscopes have higher resolution. (1 mark)
Show the mark scheme answer
Electrons have a much shorter wavelength than light.
3. Describe the role of the Golgi apparatus. (2 marks)
Show the mark scheme answer
Modifies proteins, for example adding carbohydrates (1), and packages them into vesicles for secretion (1).
Cell Structure FAQs
What does Cell Structure cover?
Microscopy, organelles and prokaryotic versus eukaryotic cells.
Which practical links here?
Preparing slides and using a graticule to measure cells.
What is the cytoskeleton?
A network of protein fibres that supports the cell and moves organelles.
Revise this topic with flashcards: OCR A Level Biology A H420 Flashcards, with mark scheme answers for Anki and Quizlet.
