Copy of Cell Cycle and Mitosis Worksheet.pdf - Cell Cycle and ... - Free Printable

Let’s go step by step to answer each question based on the cell cycle and mitosis diagram.

We are told that cells A and F show early and late stages of the same phase — so they must be prophase (since in prophase, chromosomes condense and the nucleus breaks down — early vs late).

Now let’s look at each question:

1. Cells A and F show an early and a late stage of the same phase of mitosis. What phase is it?
→ Since A shows chromatin starting to condense and F shows fully condensed chromosomes with nuclear envelope breaking down, this is prophase.

2. In cell C, what structure(s) are represented by label X?
→ Looking at cell C (which appears to be metaphase), label X points to the spindle fibers attaching to chromosomes. So, spindle fibers or microtubules.

3. Which cell is in metaphase?
→ Metaphase is when chromosomes line up in the middle. That’s cell C.

4. Which cell is in the first phase of mitosis?
→ First phase of mitosis is prophase → cell A (early prophase) or F (late prophase). But since A is earlier, we’ll say A.

5. In cell A, what structure is labeled Y?
→ Label Y in cell A points to the nucleolus or nucleus still intact — but since it’s early prophase, likely the nucleus or nuclear envelope.

6. Place the diagrams in order from first to last.
→ Order of mitosis: Prophase → Metaphase → Anaphase → Telophase → then back to interphase.
Looking at the images:
- A = early prophase
- F = late prophase
- C = metaphase
- E = anaphase (chromosomes pulling apart)
- D = telophase (two nuclei forming)
- B = cytokinesis / two daughter cells
So order: A → F → C → E → D → B

7. Are the cells depicted plant or animal cells? Explain your answer.
→ Animal cells! Because you can see centrioles (in some cells like A and F) and no cell wall. Also, during cytokinesis (cell B), there’s cleavage furrow, not cell plate. Plant cells have cell walls and form cell plates.

8. Which is the longest phase of the cell cycle?
→ Interphase — because the cell spends most of its time growing and copying DNA before dividing. Even though it’s not part of mitosis, it’s part of the full cell cycle.

9. Why is mitosis important?
→ It allows growth, repair of damaged tissues, and replacement of old cells. Without mitosis, organisms couldn’t grow or heal.

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Final Answer:

1. Prophase
2. Spindle fibers
3. Cell C
4. Cell A
5. Nucleus (or nuclear envelope)
6. A → F → C → E → D → B
7. Animal cells — because they have centrioles and no cell wall; also show cleavage furrow in cytokinesis.
8. Interphase
9. Mitosis is important for growth, tissue repair, and replacing dead or damaged cells.