Both lipid and protein contents are equal in membrane of which organelle –
**Core Concept:** Membrane composition of cellular organelles plays a crucial role in determining their function and characteristics. The main components of cellular membranes include lipids and proteins, which interact and form a dynamic structure.
**Why the Correct Answer is Right:** The correct answer, GOLGI APPARATUS (Option C), is right because the membrane of the Golgi apparatus consists of both lipids and proteins in equal amounts. The Golgi apparatus is an organelle responsible for sorting, modifying, and packaging proteins and lipids, which are then transported to their respective destinations within the cell or to the extracellular space.
**Why Each Wrong Option is Incorrect:**
A. ER (Endoplasmic Reticulum) has a different membrane composition. The endoplasmic reticulum contains primarily phospholipids, which are a type of lipid, and proteins are less abundant. This results in a higher lipid:protein ratio compared to the Golgi apparatus.
B. Mitochondria also have a different membrane composition. Mitochondrial membranes are composed primarily of phospholipids, with fewer proteins. This leads to a higher lipid:protein ratio compared to the Golgi apparatus.
C. Lysosomes have a similar lipid:protein ratio to the Golgi apparatus due to their similar membrane composition. However, lysosomes primarily function in cellular digestion and waste disposal, while the Golgi apparatus participates in sorting, modifying, and packaging proteins and lipids.
D. Plasma membrane, also known as the cell membrane, consists mostly of phospholipids and proteins but has a higher lipid:protein ratio compared to the Golgi apparatus. The plasma membrane serves to regulate the passage of substances into and out of the cell, while the Golgi apparatus plays a crucial role in intracellular transport.
**Clinical Pearl:** Understanding the membrane composition of cellular organelles not only helps in identifying their specific functions but also provides valuable information for diagnosing diseases related to organelle dysfunction, such as in cystic fibrosis, where mutations in the CFTR gene lead to impaired functioning of the plasma membrane, including the lipid and protein composition.
**Correct Answer:** Golgi apparatus (Option C)
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**Core Concept:** Membrane proteins and lipids are essential components of cellular membranes, playing a vital role in cell structure, signaling, and transport processes. Membrane proteins can be classified into two main categories: integral proteins and peripheral proteins.
**Why the Correct Answer is Right:** The Golgi apparatus is composed of both lipids and proteins, with an equal ratio of lipids to proteins. This balanced composition is crucial for its function in sorting, modifying, and packaging proteins and lipids destined for other cellular compartments or secretion.
**Why Each Wrong Option is Incorrect:**
A. Mitochondria contain a higher lipid:protein ratio compared to the Golgi apparatus. Mitochondria primarily function in cellular respiration and energy production, whereas the Golgi apparatus plays a distinct role in protein and lipid transport.
B. Mitochondria have a higher lipid:protein ratio than the Golgi apparatus. Mitochondria are involved in energy production and cellular respiration, while the Golgi apparatus focuses on protein and lipid sorting and transport.
C. L