Multiple Choice
In eukaryotic cell architecture, which option correctly lists the three major parts of a typical cell?
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1. Overview of Cell Biology
Eukaryotic Cell Architecture
Multiple Choice
In eukaryotic cell architecture, the cell's glycocalyx is best described as which of the following?
A
The phospholipid bilayer itself, consisting primarily of fatty acids and sterols that form the membrane barrier
B
An intracellular matrix of enzymes and ribosomes suspended in cytosol that carries out most metabolic reactions
C
A cytoskeletal lattice of actin and intermediate filaments that provides mechanical support beneath the plasma membrane
D
A carbohydrate-rich layer on the extracellular surface of the plasma membrane composed of glycoproteins, glycolipids, and proteoglycans
Verified step by step guidance1
Step 1: Understand the term 'glycocalyx' in the context of eukaryotic cell architecture. The glycocalyx refers to a specific structure associated with the plasma membrane.
Step 2: Recall that the plasma membrane consists of a phospholipid bilayer with embedded proteins, but the glycocalyx is distinct from the bilayer itself.
Step 3: Recognize that the glycocalyx is a carbohydrate-rich layer found on the extracellular surface of the plasma membrane, meaning it is outside the cell, not inside or within the membrane.
Step 4: Identify the molecular components of the glycocalyx, which include glycoproteins, glycolipids, and proteoglycans. These molecules have carbohydrate chains attached that form this layer.
Step 5: Differentiate the glycocalyx from other cellular structures such as the cytoskeleton (actin and intermediate filaments) and the intracellular matrix (enzymes and ribosomes), which are located inside the cell and serve different functions.
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