Question: Which of the following is NOT a component typically found in an animal cell diagram?
- Nucleus
- Cell Wall
- Mitochondria
- Cell Membrane
Answer: B) Cell Wall
Animal Cell Diagram Solution:
Various components play crucial roles in the cell’s functions.
- A) Nucleus: It is the control center of the cell, containing genetic information in the form of DNA.
- B) Cell Wall: The cell wall is NOT a component of an animal cell diagram. Instead, it is a characteristic feature of plant cells, providing structural support and protection.
- C) Mitochondria: Mitochondria are prominently featured in an animal cell diagram. They are responsible for producing energy through cellular respiration.
- D) Cell Membrane: The cell membrane, also known as the plasma membrane, is another essential component in an animal cell diagram. It surrounds the cell, controlling the passage of substances in and out.
Brief solution:
The cell wall is a rigid structure that surrounds the cell membrane of plant cells and some other types of cells. It provides support and protection for the cell. Animal cells do not have a cell wall because they are more flexible and need to be able to move around more easily.
To summarize, the component that is NOT typically present is the cell wall.
Why is the Plasma Membrane Called a Selectively Permeable Membrane?
The plasma membrane is often referred to as a selectively permeable membrane due to its ability to control the movement of substances in and out of the cell. This unique characteristic is primarily attributed to the lipid bilayer structure, which allows only certain molecules to pass through while blocking others. Small, nonpolar molecules can easily diffuse across the membrane, whereas larger or charged particles require specific transport proteins. This selectivity is crucial for maintaining homeostasis, enabling cells to regulate their internal environment and respond to changes in their surroundings. Thus, the plasma membrane plays a vital role in cellular function and integrity.
