Problem 116 - Objective Biology for NEET

Question

Which structure is formed by the process of packaging in golgi apparatus? (a) Ribosomes (b) Protein granules (c) Lysosomes (d) Centrosomes

Step-by-Step Solution

Answer

The correct answer is (c) Lysosomes. They are structures formed by the process of packaging in Golgi apparatus.

Step 1: Understand the functions of the options

Firstly, you need to understand the products formed by each cellular organelle. Ribosomes are involved in protein synthesis, not packaging. Protein granules are storage for the synthesized proteins, while centrosomes aid in cell division.

Step 2: Recall the function of the Golgi Apparatus

Secondly, it's important to recall the function of the Golgi apparatus in a cell. The Golgi apparatus functions in the processing and packaging of proteins and lipids into vesicles.

Step 3: Match the function with the options

Thirdly, match the functions of the Golgi apparatus with the given options. The closest match is lysosomes, as they are formed by the Golgi apparatus. Lysosomes contain digestive enzymes and are involved in intracellular digestion.

Key Concepts

Cellular Organelles

Cellular organelles are specialized structures within a cell, each performing unique functions essential for the cell’s survival and proper functioning. Think of a cell as a tiny factory, with each organelle serving as a separate department, each with its own role. For instance, mitochondria are known as the powerhouses of the cell, generating energy through respiration.

On the other hand, ribosomes, mentioned in the exercise, are the sites of protein synthesis. They read the genetic instructions to build proteins from amino acids. Centrosomes help in organizing microtubules and are crucial during cell division. The exercise emphasizes the Golgi apparatus, another such organelle responsible for modifying, sorting, and packing proteins and lipids for either secretion or for use within the cell. This intricate network of responsibilities showcases the complexity and the precision of cellular function.

Protein Processing

Protein processing is a fundamental function of the Golgi apparatus, where proteins undergo several modifications after being synthesized by ribosomes. This can include the addition of sugar molecules to form glycoproteins, or phosphate groups in a process called phosphorylation.

Proteins are transported to the Golgi apparatus in vesicles that bud off from the endoplasmic reticulum. Once in the Golgi, they are further refined, packaged into new vesicles, and directed to their final destinations, such as lysosomes (as mentioned in the exercise solution), plasma membrane, or are secreted out of the cell. Improper protein processing can lead to a range of diseases, which underscores the importance of this cellular mechanism.

Intracellular Digestion

Intracellular digestion is the breakdown of substances within the cell. This process happens in organelles known as lysosomes, which are filled with digestive enzymes that can break down macromolecules such as proteins, nucleic acids, and polysaccharides.

The Golgi apparatus is critical in the formation of lysosomes by packaging the digestive enzymes into vesicles that mature into fully functional lysosomes. Once formed, they fuse with other vesicles containing material to be digested, such as food particles, unwanted or damaged cell organelles, or invading pathogens. This helps in recycling cell components and defense against diseases. The exercise correctly identifies lysosomes as a product of the Golgi apparatus, directly linking it to the essential cellular function of intracellular digestion.