Cell Biology

To solve the problem, we need to identify the cell organelles that are found in animals but absent in plant cells, present in plant cells but absent in animals, and present only in prokaryotes.

1. Understanding the Cell Organelles:
Different cell organelles are present in various types of cells (animal, plant, or prokaryotic). The following are relevant organelles:

• Centriole: Found in animal cells but absent in most plant cells. It plays a role in cell division.
• Cytoskeleton: Found in both animal and plant cells, providing structure and support.
• Inclusion bodies: Found in animal cells, they serve as storage structures.
• Axoneme: Present in the flagella of both animal and plant cells.
• Flagellum: Found in both prokaryotes and some eukaryotic cells, like animal cells.
• Mesosomes: Found in prokaryotes, involved in cellular processes like respiration.
• Ribosomes: Present in all cells, involved in protein synthesis.
• Plasma membrane: Found in both animal and plant cells, regulates what enters and exits the cell.
• Fimbriae: Found in prokaryotes, used for attachment to surfaces.

2. Analyzing the Correct Option:
The correct answer is the one that matches the organelles found in animal cells but not in plant cells, in plant cells but not in animals, and those present in prokaryotes.

Final Answer:
The correct option is (A) Centriole, Cytoskeleton, Inclusion bodies.

Matching cell shapes
Tracheid cells are elongated (I - D).
Nerve cells are branched and long (II - C).
White blood cells have an amoeboid shape (III - B).
Red blood cells are round and biconcave (IV - A).
Final Answer:

Step 1: Assertion (A) is correct. Hydrolytic enzymes are indeed present in lysosomes. These enzymes help in breaking down various substrates inside the lysosomes. They are essential for digesting macromolecules, which are broken down into simpler compounds for reuse or excretion. Step 2: Reason (R) is incorrect. Although fatty acid catabolism occurs in the cell, it primarily takes place in the mitochondria through a process called beta-oxidation, not in the lysosomes. Lysosomes are involved in the breakdown of various substances, but fatty acid catabolism is not one of their primary functions.
Step 3: Since assertion (A) is correct but reason (R) is incorrect, the correct option is (3) A is correct but R is incorrect.

Step 1: The Eukaryotic cytoskeleton plays a crucial role in maintaining the shape of the cell, facilitating movement, and enabling intercellular signaling. This system of filaments is involved in the transport of molecules, vesicles, and organelles throughout the cell, which is crucial for cell signaling. Microfilaments and microtubules, key components of the cytoskeleton, are involved in these processes. Hence, the correct answer is Eukaryotic cytoskeleton — Signalling across the cell.
Step 2: Centrosome (Option 2) is primarily involved in organizing microtubules during cell division, not signaling.
Step 3: Prokaryotic cytoskeleton (Option 3) is found in prokaryotic cells and is more involved in cell motility, not signaling.
Step 4: Axoneme (Option 4) is a part of the structure of cilia and flagella and plays a role in intracellular transport, not in the signaling function across the cell.