Problem 20 - Objective Biology for NEET

Question

If volume of the cell is filled with semi-fluid matrix called cytoplasm, what kind of cell is it? (a) Eukaryotic (b) Prokaryotic (c) Both (a) and (b) (d) None of these

Step-by-Step Solution

Answer

The correct answer is (c) Both (a) and (b). Both Eukaryotic and Prokaryotic cells can be filled with a semi-fluid matrix called cytoplasm.

Step 1: Understanding the basic structures of cells

Eukaryotic and Prokaryotic cells both contain cytoplasm, a semi-fluid matrix that fills the cell. The cytoplasm is where the functions for cell expansion, growth, metabolism, and replication are carried out.

Step 2: Identify the cell type

Knowing that both cell types contain cytoplasm, the cell type that is filled with a semi-fluid matrix called cytoplasm can therefore be both a Eukaryotic and a Prokaryotic cell.

Key Concepts

Eukaryotic Cells

Eukaryotic cells are complex cells that are characterized by having a nucleus and various membrane-bound organelles. This separation allows different functions to occur simultaneously within the cell. In eukaryotic cells, the cytoplasm plays a crucial role by hosting both the organelles and the metabolic processes necessary for the cell's survival.

• They contain organelles such as the mitochondria, which produce energy, and the endoplasmic reticulum, which is involved in protein and lipid synthesis.
• They have a true nucleus that houses the cell's genetic material (DNA), which is separated from the rest of the cell by a nuclear membrane.
• Eukaryotic cells can be found in many organisms including plants, animals, fungi, and protists.

In terms of size, eukaryotic cells are generally larger than prokaryotic cells. This is because they contain more complex structures and organelles that perform specific functions within the cell. Understanding eukaryotic cells is crucial as they represent the foundation of all multicellular organisms.

Prokaryotic Cells

Prokaryotic cells are simpler and generally smaller than eukaryotic cells. They do not have a nucleus or other membrane-bound organelles. Instead, their genetic material is located in a region called the nucleoid, which is not enclosed by a membrane. Despite their simplicity, they are incredibly efficient at various biological processes.

• Prokaryotic cells include bacteria and archaea, which are often unicellular.
• They have a rigid cell wall, which provides structural support and protection.
• The absence of membrane-bound organelles allows for quicker replication and metabolic processes.

The cytoplasm in prokaryotic cells is the site for metabolic reactions and contains all the necessary enzymes and molecules that aid in their functions. Even though prokaryotic cells lack complexity, they are vital to the ecosystem, participating in processes like nitrogen fixation, as well as being part of many symbiotic relationships.

Cytoplasm

The cytoplasm is a semi-fluid substance that fills the interior of both prokaryotic and eukaryotic cells. It serves as a medium that facilitates the movement and interaction of molecules within the cell while providing a platform for numerous biochemical reactions necessary for life.

• Cytoplasm consists mainly of water, salts, and proteins.
• In eukaryotic cells, it contains the cytoskeleton, which provides shape and support.
• It is the site for major cellular processes like glycolysis, protein synthesis, and cell division.

The cytoplasm not only acts as a buffer that protects the cell's interior from damage but also plays a central role in the movement of materials around the cell. This matrix is essential for maintaining the cell's structural integrity and facilitates rapid cellular responses to environmental changes. Understanding the role of cytoplasm can help in comprehending how cells function as units of life.