What organelle is only associated with plant cells?
A.
Cell wall
B.
Ribosome
C.
Cytoplasm
D.
Golgi apparatus
The Correct Answer and Explanation is:
The correct answer is A. Cell wall.
Explanation:
Plant cells and animal cells share many common structures, such as the nucleus, cytoplasm, ribosomes, and the Golgi apparatus. However, there are some distinct differences, and the presence of a cell wall is one of the most prominent features that sets plant cells apart from animal cells.
Cell Wall (A):
The cell wall is a rigid, protective layer that surrounds the cell membrane in plant cells, providing structural support and protection. It is primarily composed of cellulose, a complex carbohydrate that gives the wall its strength. The cell wall helps maintain the shape of the plant cell and protects it from mechanical stress or damage. It also regulates the intake and release of water, preventing the plant cell from bursting in a hypotonic environment (where water enters the cell by osmosis). In contrast, animal cells do not have a cell wall, which is why their shape is more flexible and they can form different shapes depending on their functions.
Ribosome (B):
Ribosomes are present in both plant and animal cells. They are essential for protein synthesis, translating the genetic instructions from mRNA into proteins. Therefore, ribosomes cannot be used to differentiate between plant and animal cells.
Cytoplasm (C):
The cytoplasm is the jelly-like fluid that fills the cell, in which organelles are suspended. It is found in both plant and animal cells, facilitating the movement of materials within the cell and housing many biochemical processes.
Golgi Apparatus (D):
The Golgi apparatus, responsible for modifying, packaging, and sorting proteins and lipids, is also found in both plant and animal cells.
In conclusion, while ribosomes, cytoplasm, and the Golgi apparatus are common to both plant and animal cells, the cell wall is unique to plant cells. It provides mechanical strength and structural integrity, contributing to the overall support and rigidity of plants.