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Which functions both as a passageway for intracellular transport and as a manufacturing surface?
Endoplasmic reticulum
Ribosome
Plastids
Mitochondria
Endoplasmic reticulum
The Endoplasmic Reticulum (ER) functions as the primary intracellular transport system, moving materials within the cell, and serves as a vital manufacturing surface for synthesizing proteins (Rough ER) and lipids (Smooth ER). Its extensive network of membrane-bound sacs and tubules provides the structural platform for these metabolic processes.
The Endoplasmic Reticulum (ER) functions as the primary intracellular transport system, moving materials within the cell, and serves as a vital manufacturing surface for synthesizing proteins (Rough ER) and lipids (Smooth ER). Its extensive network of membrane-bound sacs and tubules provides the structural platform for these metabolic processes.
Think of the ER as a dual-purpose factory and highway: the 'assembly line' surface produces goods (proteins/lipids), while the 'conveyor belt' tunnels transport these products to different parts of the warehouse (cell).
ER = Export & Refine (or Export & Repair) to remember its role in moving products and building structures.
RoughERтЖТProteinSynthesis
SmoothERтЖТLipidSynthesis
The Rough ER is studded with ribosomes, which facilitate protein synthesis and transport these proteins into the ER lumen for modification. The Smooth ER lacks ribosomes and is responsible for the synthesis of phospholipids, steroids, and the detoxification of drugs and poisons, while also acting as a scaffold for chemical reactions.
Rough ER contains ribosomes for protein manufacturing.
Smooth ER is involved in lipid and steroid synthesis.
The network is continuous with the nuclear envelope.
It acts as an intracellular transport channel.
Increases surface area for metabolic activities
Provides efficient compartmentalization of cell processes
Protein folding and modification
Detoxification in liver cells
Ribosomes are the site of protein synthesis but do not act as the transport network themselves.
Mitochondria are the powerhouse of the cell, generating ATP rather than acting as the primary manufacturing/transport highway.
Plastids are organelles found in plant cells for photosynthesis or storage, not general intracellular transport.
A is correct тАФ Endoplasmic reticulum acts as a vital channel for the intracellular transport of materials and as a site for the synthesis of proteins and lipids.
Remember: The 'Rough' ER is rough because of ribosomes (protein synthesis), while 'Smooth' ER is smooth because it lacks ribosomes and synthesizes lipids.
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