Cell Division, Cell Diversity and Cellular Organisation | OCR A-Level Biology A (H420)
Cell Division, Cell Diversity and Cellular Organisation
- 80 questions
- 6 subtopics
- Module 2: Foundations in biology
- Component 01, Component 02 and Component 03
Cell division, cell diversity and cellular organisation closes Module 2.
It covers the cell cycle and its checkpoints, the stages of mitosis and meiosis and what each one produces, how cells specialise for particular jobs, the tissues and organs they build, and stem cells.
Sample questions from Cell Division, Cell Diversity and Cellular Organisation
Answer each one closed book first, then open the answer.
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The cell cycle
What is the main event of the S phase?
Show the answer
DNA replication occurs, producing two identical copies of each chromosome. -
The cell cycle
Define cytokinesis.
Show the answer
The division of the cytoplasm following mitosis to form two separate cells. -
Mitosis and observing it in root tips
What happens to spindle fibres during anaphase?
Show the answer
They shorten, pulling chromatids to opposite poles. -
Mitosis and observing it in root tips
Why is mitosis significant for tissue repair?
Show the answer
It replaces damaged or dead cells. -
Meiosis
What is separated during meiosis II?
Show the answer
Sister chromatids are separated. -
Meiosis
What occurs during prophase 2 of meiosis?
Show the answer
Chromosomes condense, nuclear envelope breaks down, and spindle fibres form. -
Specialised cells
What is the function of lysosomes in neutrophils?
Show the answer
They contain enzymes that digest engulfed pathogens during phagocytosis. -
Specialised cells
Why do palisade cells contain many chloroplasts?
Show the answer
To maximise the rate of photosynthesis.
The 6 subtopics
One subtopic is one session. Work down the list.
| Subtopic | What it covers | Questions |
|---|---|---|
| The cell cycle | The five stages in order, what happens during G1, S and G2, cytokinesis, and the checkpoints that control progression. | 8 |
| Mitosis and observing it in root tips | Prophase, metaphase, anaphase and telophase, how cytokinesis differs in plant and animal cells, why mitosis matters for growth and repair, and the root tip squash. | 20 |
| Meiosis | How meiosis halves the chromosome number, the independent assortment and crossing over that generate variation, and the stages of meiosis I and meiosis II in order. | 17 |
| Specialised cells | Guard cells, root hair cells, palisade cells, sperm cells, neutrophils, erythrocytes and the epithelia — and what fits each for the job it does. | 16 |
| Tissues, organs and organ systems | What separates a tissue from an organ and an organ system, with squamous and ciliated epithelium, cartilage, muscle, xylem and phloem as examples. | 9 |
| Stem cells and differentiation | What a stem cell is and what differentiation does, the shared origins of blood cells and of xylem and phloem, meristems, and the medical uses being explored. | 10 |
How the guide is worked
Answering a question from memory stores it far better than reading the answer again. The guide runs that as a fixed procedure on one subtopic at a time, about twenty minutes a session.
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Step 1 · Closed book
Cover the answers. Work through one subtopic and write down what you can. Leave blanks where you have nothing.
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Step 2 · Open book
Go back to the top. Read each printed answer and write it out in full, including the ones you had right.
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Step 3 · Closed book again
Same questions, same order, from memory. The gap between pass one and pass three is the session result.
Read the full method, the return schedule and the research behind it.
Nearby sections
OCR A-Level Biology A Active Recall Guide
Every section, not just this one. 1,833 questions with their answers.