Multiple Choice
Which plant cell type primarily facilitates gas exchange by regulating the opening and closing of stomata?
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18. Cell Junctions and Tissues
Plant Tissue
Multiple Choice
In plant tissues, plant cell walls consist mainly of which polysaccharide?
A
Chitin
B
Peptidoglycan
C
Glycogen
D
Cellulose
Verified step by step guidance1
Recall the main structural components of plant cell walls, which provide rigidity and support to plant cells.
Identify the polysaccharides listed in the options: Chitin, Peptidoglycan, Glycogen, and Cellulose, and consider their biological roles and where they are commonly found.
Understand that Chitin is primarily found in fungal cell walls and exoskeletons of arthropods, Peptidoglycan is a major component of bacterial cell walls, and Glycogen serves as an energy storage polysaccharide in animals.
Recognize that Cellulose is a polysaccharide composed of β-glucose units linked by β-1,4-glycosidic bonds, forming long chains that provide structural support in plant cell walls.
Conclude that the main polysaccharide in plant cell walls is Cellulose, which is responsible for the strength and rigidity of the plant tissue.
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