The cell cycle worksheet online exercise for - Free Printable

Problem Analysis:

The worksheet focuses on the cell cycle, which is the series of events that take place in a cell leading to its division and duplication. The task involves labeling parts of the cell cycle diagram, matching phases with their descriptions, and identifying the phases of mitosis.

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Solution:

#### Part A: Label the parts of the cell cycle diagram
The cell cycle consists of several key phases. Based on the diagram provided, here are the labels for each part:

1. A: Mitosis (M phase) - This is the phase where the cell divides into two identical daughter cells.
2. B: G2 phase - This is the period after DNA replication when the cell prepares for mitosis.
3. C: Synthesis (S) phase - During this phase, DNA replication occurs.
4. D: G1 phase - This is the initial growth phase before DNA replication.
5. E: Cytokinesis - This is the final stage where the cytoplasm divides, completing cell division.
6. F: Interphase - This is the overall phase between one cell division and the next, consisting of G1, S, and G2 phases.

So, the labeled answers are:
- A: Mitosis (M phase)
- B: G2 phase
- C: Synthesis (S) phase
- D: G1 phase
- E: Cytokinesis
- F: Interphase

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#### Part B: Match the phase of the cell cycle with the correct description
We need to match each phase with its corresponding description:

1. Interphase:
- Description: "Period of cell growth before the DNA is duplicated" (C).
- Explanation: Interphase is the longest phase of the cell cycle, during which the cell grows and prepares for DNA replication.

2. G1 phase:
- Description: "Period of cell growth before the DNA is duplicated" (C).
- Explanation: G1 is part of interphase where the cell grows and performs normal functions.

3. Synthesis (S) phase:
- Description: "Period when the DNA/chromosomes are duplicated" (B).
- Explanation: During the S phase, DNA replication occurs, resulting in duplicated chromosomes.

4. G2 phase:
- Description: "Period after the DNA is duplicated and the cell prepares to divide; checks for errors" (E).
- Explanation: G2 is the phase following DNA replication where the cell continues to grow and prepares for mitosis.

5. Mitosis (M phase):
- Description: "Cell divides creating two identical cells" (A).
- Explanation: Mitosis is the phase where the nucleus divides, resulting in two genetically identical daughter cells.

6. Cytokinesis:
- Description: "Division of the parent cell cytoplasm" (D).
- Explanation: Cytokinesis is the physical division of the cytoplasm, completing the cell division process.

So, the matched answers are:
- Interphase: C
- G1: C
- Synthesis (S): B
- G2: E
- Mitosis (M phase): A
- Cytokinesis: D

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#### Part C: Identify the phases of Mitosis
The phases of mitosis are prophase, metaphase, anaphase, and telophase. We need to match the diagrams with these phases:

1. First Diagram:
- Shows chromosomes condensing and moving toward the center of the cell.
- Phase: Prophase.

2. Second Diagram:
- Shows chromosomes aligned at the metaphase plate (equatorial plane).
- Phase: Metaphase.

3. Third Diagram:
- Shows sister chromatids separating and moving toward opposite poles.
- Phase: Anaphase.

4. Fourth Diagram:
- Shows chromosomes reaching the poles, and the nuclear envelope beginning to reform.
- Phase: Telophase.

So, the identified phases are:
- First Diagram: Prophase
- Second Diagram: Metaphase
- Third Diagram: Anaphase
- Fourth Diagram: Telophase

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Final Answers:

#### Part A:
- A: Mitosis (M phase)
- B: G2 phase
- C: Synthesis (S) phase
- D: G1 phase
- E: Cytokinesis
- F: Interphase

#### Part B:
- Interphase: C
- G1: C
- Synthesis (S): B
- G2: E
- Mitosis (M phase): A
- Cytokinesis: D

#### Part C:
- First Diagram: Prophase
- Second Diagram: Metaphase
- Third Diagram: Anaphase
- Fourth Diagram: Telophase

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Boxed Final Answer:

\[
\boxed{
\text{A: Mitosis (M phase), B: G2 phase, C: Synthesis (S) phase, D: G1 phase, E: Cytokinesis, F: Interphase}
}
\]
\[
\boxed{
\text{Interphase: C, G1: C, Synthesis (S): B, G2: E, Mitosis (M phase): A, Cytokinesis: D}
}
\]
\[
\boxed{
\text{Prophase, Metaphase, Anaphase, Telophase}
}
\]