Educational worksheet on cells and their organelles, featuring a labeled diagram and questions about cell biology.
Diagram of a cell with text explaining cell structure and organelles, including the cell membrane, cell wall, centrosome, and nucleus.
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Show Answer Key & Explanations
Step-by-step solution for: Cells And Their Organelles Worksheet | Biology worksheet ...
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Show Answer Key & Explanations
Step-by-step solution for: Cells And Their Organelles Worksheet | Biology worksheet ...
Let's solve the questions based on the provided text about Cells and Their Organelles. I'll answer each question clearly and explain the reasoning.
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Answer: The cell is the basic unit of life.
Explanation:
The first sentence in the passage states: *"The cell is the basic unit of life."* This means that all living organisms are made up of cells, and life processes begin at the cellular level.
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Answer: All cells are surrounded by a cell membrane.
Explanation:
The passage says: *"All cells are surrounded by a cell membrane."* This is true for both animal and plant cells. Plant cells also have a cell wall *outside* the membrane, but the cell membrane is present in all cells.
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Answer: Semipermeable means that it allows some substances to pass into the cell and blocks others.
Explanation:
The text explains: *"The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others."* This selective permeability is essential for maintaining the internal environment of the cell.
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Answer: A double layer of phospholipids and embedded proteins.
Explanation:
The passage clearly states: *"It is composed of a double layer of phospholipids and embedded proteins."* These two components form the fluid mosaic model of the cell membrane.
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Answer: Plasma membrane.
Explanation:
Though not explicitly stated in the passage, this is standard biological terminology. The plasma membrane is another name for the cell membrane. The blank likely expects "plasma".
> ✔ So the full answer is: plasma
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Answer: Animal cells
Explanation:
The passage says: *"Only animal cells have centrosomes."* Since centrioles are part of the centrosome, they are found only in animal cells (not in plant cells or most other eukaryotes).
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Answer: Cell wall
Explanation:
The passage mentions: *"Plant cells have an additional layer surrounding them called the cell wall."* It also notes that bacteria have cell walls (though not mentioned directly here, it's implied by the question). The cell wall provides structural support and protection.
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Answer:
- Centrioles are found at the center of the centrosome.
- They help the cell by organizing microtubules, which are involved in maintaining cell shape and moving chromosomes during cell division (mitosis).
Explanation:
From the passage: *"The centriole is the dense center of the centrosome."* And: *"The centrosome is where microtubules are made."* During mitosis, centrioles help organize the spindle fibers (made of microtubules) that separate chromosomes.
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1. Cell
2. Cell membrane
3. Allows some substances to pass in and blocks others
4. Phospholipids and proteins
5. Plasma
6. Animal cells
7. Cell wall
8. Centrosome; they help organize microtubules for cell structure and division
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Let me know if you'd like a version formatted for printing or coloring instructions!
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1. At what level of organization does life begin?
Answer: The cell is the basic unit of life.
Explanation:
The first sentence in the passage states: *"The cell is the basic unit of life."* This means that all living organisms are made up of cells, and life processes begin at the cellular level.
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2. What surrounds all cells?
Answer: All cells are surrounded by a cell membrane.
Explanation:
The passage says: *"All cells are surrounded by a cell membrane."* This is true for both animal and plant cells. Plant cells also have a cell wall *outside* the membrane, but the cell membrane is present in all cells.
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3. What is meant by semipermeable?
Answer: Semipermeable means that it allows some substances to pass into the cell and blocks others.
Explanation:
The text explains: *"The cell membrane is semipermeable, allowing some substances to pass into the cell and blocking others."* This selective permeability is essential for maintaining the internal environment of the cell.
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4. What 2 things make up the cell membrane?
Answer: A double layer of phospholipids and embedded proteins.
Explanation:
The passage clearly states: *"It is composed of a double layer of phospholipids and embedded proteins."* These two components form the fluid mosaic model of the cell membrane.
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5. The cell membrane is also called the ________ membrane.
Answer: Plasma membrane.
Explanation:
Though not explicitly stated in the passage, this is standard biological terminology. The plasma membrane is another name for the cell membrane. The blank likely expects "plasma".
> ✔ So the full answer is: plasma
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6. Centrioles are found inside of what type of cell?
Answer: Animal cells
Explanation:
The passage says: *"Only animal cells have centrosomes."* Since centrioles are part of the centrosome, they are found only in animal cells (not in plant cells or most other eukaryotes).
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7. What additional layer is found around the outside of plant cells and bacteria?
Answer: Cell wall
Explanation:
The passage mentions: *"Plant cells have an additional layer surrounding them called the cell wall."* It also notes that bacteria have cell walls (though not mentioned directly here, it's implied by the question). The cell wall provides structural support and protection.
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8. Centrioles are found at the center of the ________. How do they help the cell?
Answer:
- Centrioles are found at the center of the centrosome.
- They help the cell by organizing microtubules, which are involved in maintaining cell shape and moving chromosomes during cell division (mitosis).
Explanation:
From the passage: *"The centriole is the dense center of the centrosome."* And: *"The centrosome is where microtubules are made."* During mitosis, centrioles help organize the spindle fibers (made of microtubules) that separate chromosomes.
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✔ Final Answers Summary:
1. Cell
2. Cell membrane
3. Allows some substances to pass in and blocks others
4. Phospholipids and proteins
5. Plasma
6. Animal cells
7. Cell wall
8. Centrosome; they help organize microtubules for cell structure and division
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Let me know if you'd like a version formatted for printing or coloring instructions!
Parent Tip: Review the logic above to help your child master the concept of cell and their organelles worksheet.
