Solved 9) CELLS alive! - Cell Cycle Worksheet Whats | Chegg.com - Free Printable
Educational worksheet: Solved 9) CELLS alive! - Cell Cycle Worksheet Whats | Chegg.com. Download and print for classroom or home learning activities.
PNG
899×649
397.8 KB
Free · Personal Use
Quality Assured by Worksheets Library Team
Reviewed for educational accuracy and age-appropriateness
ID: #1099802
⭐
Show Answer Key & Explanations
Step-by-step solution for: Solved 9) CELLS alive! - Cell Cycle Worksheet Whats | Chegg.com
▼
Show Answer Key & Explanations
Step-by-step solution for: Solved 9) CELLS alive! - Cell Cycle Worksheet Whats | Chegg.com
This worksheet is about the cell cycle, which is the series of events that take place in a cell leading to its division and duplication. The diagram shows the main phases of the cell cycle, including interphase (G1, S, G2), mitosis (M), and the G0 phase.
Let’s go through each labeled part of the diagram and explain what's happening at each stage:
---
- What's happening now?
The cell grows in size, carries out normal functions, and synthesizes proteins and organelles in preparation for DNA replication. It also checks if conditions are favorable for division.
- Key activity: Cell growth and preparation for DNA synthesis.
---
- What's happening now?
This is a critical checkpoint where the cell evaluates whether it has grown enough, has sufficient nutrients, and whether the DNA is undamaged. If all is good, the cell proceeds to the S phase. Otherwise, it may enter G0 or repair damage.
- Purpose: Prevents damaged or underdeveloped cells from replicating DNA.
---
- What's happening now?
DNA replication occurs. Each chromosome is duplicated, resulting in two sister chromatids joined at the centromere.
- Key event: Chromosomal DNA is copied.
---
- What's happening now?
The cell checks whether DNA replication was completed accurately and whether the cell has grown enough. If everything is okay, the cell proceeds to mitosis.
- Purpose: Ensures DNA is fully and correctly replicated before cell division.
---
- What's happening now?
The cell continues to grow and produces proteins and organelles needed for mitosis, such as microtubules for the spindle apparatus.
- Key activity: Preparation for mitosis.
---
- What's happening now?
The nucleus divides. This includes four stages: prophase, metaphase, anaphase, and telophase. After mitosis, cytokinesis usually follows (division of the cytoplasm).
- Result: Two genetically identical nuclei.
---
- What's happening now?
The cytoplasm divides, forming two separate daughter cells. This typically occurs after mitosis.
- Note: Though not always shown separately, cytokinesis completes the process of cell division.
---
- What's happening now?
This is the entire period between cell divisions, including G1, S, and G2 phases. The cell performs its normal functions and prepares for division.
- Important: Most of the cell’s life is spent in interphase.
---
- What's happening now?
Some cells exit the cell cycle and enter a resting state called G0. These cells are not actively preparing to divide. They may remain in G0 indefinitely (e.g., nerve cells) or re-enter the cycle later.
- Example: Mature neurons, muscle cells.
---
- What's happening now?
Nuclear division occurs. Chromosomes condense, align, separate, and move to opposite poles of the cell.
- Sub-stages: Prophase → Metaphase → Anaphase → Telophase.
---
| Number | Phase/Checkpoint | What's Happening Now? |
|--------|------------------------|------------------------|
| 1 | G1 Phase | Cell growth and preparation for DNA replication |
| 2 | G1 Checkpoint | Checks if cell is ready to replicate DNA |
| 3 | S Phase | DNA replication occurs |
| 4 | G2 Checkpoint | Checks if DNA is fully replicated and cell is ready for division |
| 5 | G2 Phase | Final preparations for mitosis |
| 6 | Mitosis (M Phase) | Nuclear division; chromosomes split |
| 7 | Cytokinesis | Cytoplasm divides into two daughter cells |
| 8 | Interphase | Period between divisions (G1 + S + G2) |
| 9 | G0 Phase | Resting state; cells not dividing |
| 10 | M Phase (Mitosis) | Division of the nucleus |
---
✔ Final Answer (Fill-in-the-blanks):
1) G1 Phase – Cell grows and prepares for DNA replication
2) G1 Checkpoint – Cell checks if conditions are right to proceed to S phase
3) S Phase – DNA replication occurs
4) G2 Checkpoint – Cell checks for DNA damage and completion of replication
5) G2 Phase – Cell prepares for mitosis by producing proteins and organelles
6) Mitosis – Nucleus divides into two nuclei
7) Cytokinesis – Cytoplasm divides, forming two daughter cells
8) Interphase – The period when the cell grows and copies its DNA
9) G0 Phase – Cells exit the cycle and enter a non-dividing state
10) M Phase – Nuclear division occurs (mitosis)
Let me know if you'd like this filled out on the image or formatted for printing!
Let’s go through each labeled part of the diagram and explain what's happening at each stage:
---
1) G1 Phase (Gap 1)
- What's happening now?
The cell grows in size, carries out normal functions, and synthesizes proteins and organelles in preparation for DNA replication. It also checks if conditions are favorable for division.
- Key activity: Cell growth and preparation for DNA synthesis.
---
2) Checkpoint #1 (G1 Checkpoint)
- What's happening now?
This is a critical checkpoint where the cell evaluates whether it has grown enough, has sufficient nutrients, and whether the DNA is undamaged. If all is good, the cell proceeds to the S phase. Otherwise, it may enter G0 or repair damage.
- Purpose: Prevents damaged or underdeveloped cells from replicating DNA.
---
3) S Phase (Synthesis)
- What's happening now?
DNA replication occurs. Each chromosome is duplicated, resulting in two sister chromatids joined at the centromere.
- Key event: Chromosomal DNA is copied.
---
4) Checkpoint #2 (G2 Checkpoint)
- What's happening now?
The cell checks whether DNA replication was completed accurately and whether the cell has grown enough. If everything is okay, the cell proceeds to mitosis.
- Purpose: Ensures DNA is fully and correctly replicated before cell division.
---
5) G2 Phase (Gap 2)
- What's happening now?
The cell continues to grow and produces proteins and organelles needed for mitosis, such as microtubules for the spindle apparatus.
- Key activity: Preparation for mitosis.
---
6) Mitosis (M Phase)
- What's happening now?
The nucleus divides. This includes four stages: prophase, metaphase, anaphase, and telophase. After mitosis, cytokinesis usually follows (division of the cytoplasm).
- Result: Two genetically identical nuclei.
---
7) Cytokinesis
- What's happening now?
The cytoplasm divides, forming two separate daughter cells. This typically occurs after mitosis.
- Note: Though not always shown separately, cytokinesis completes the process of cell division.
---
8) Interphase
- What's happening now?
This is the entire period between cell divisions, including G1, S, and G2 phases. The cell performs its normal functions and prepares for division.
- Important: Most of the cell’s life is spent in interphase.
---
9) G0 Phase
- What's happening now?
Some cells exit the cell cycle and enter a resting state called G0. These cells are not actively preparing to divide. They may remain in G0 indefinitely (e.g., nerve cells) or re-enter the cycle later.
- Example: Mature neurons, muscle cells.
---
10) M Phase (Mitosis)
- What's happening now?
Nuclear division occurs. Chromosomes condense, align, separate, and move to opposite poles of the cell.
- Sub-stages: Prophase → Metaphase → Anaphase → Telophase.
---
Summary Table:
| Number | Phase/Checkpoint | What's Happening Now? |
|--------|------------------------|------------------------|
| 1 | G1 Phase | Cell growth and preparation for DNA replication |
| 2 | G1 Checkpoint | Checks if cell is ready to replicate DNA |
| 3 | S Phase | DNA replication occurs |
| 4 | G2 Checkpoint | Checks if DNA is fully replicated and cell is ready for division |
| 5 | G2 Phase | Final preparations for mitosis |
| 6 | Mitosis (M Phase) | Nuclear division; chromosomes split |
| 7 | Cytokinesis | Cytoplasm divides into two daughter cells |
| 8 | Interphase | Period between divisions (G1 + S + G2) |
| 9 | G0 Phase | Resting state; cells not dividing |
| 10 | M Phase (Mitosis) | Division of the nucleus |
---
✔ Final Answer (Fill-in-the-blanks):
1) G1 Phase – Cell grows and prepares for DNA replication
2) G1 Checkpoint – Cell checks if conditions are right to proceed to S phase
3) S Phase – DNA replication occurs
4) G2 Checkpoint – Cell checks for DNA damage and completion of replication
5) G2 Phase – Cell prepares for mitosis by producing proteins and organelles
6) Mitosis – Nucleus divides into two nuclei
7) Cytokinesis – Cytoplasm divides, forming two daughter cells
8) Interphase – The period when the cell grows and copies its DNA
9) G0 Phase – Cells exit the cycle and enter a non-dividing state
10) M Phase – Nuclear division occurs (mitosis)
Let me know if you'd like this filled out on the image or formatted for printing!
Parent Tip: Review the logic above to help your child master the concept of the cell cycle worksheet answers.
