Multiple Choice
Which of the following statements about the secretion of human chorionic gonadotropin (hCG) is accurate?
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1. Introduction to Biology
Introduction to Biology
Multiple Choice
Radiolarians secrete glassy exoskeletons made of which of the following?
A
Cellulose
B
Silicon dioxide (SiO\(_2\))
C
Calcium carbonate (CaCO\(_3\))
D
Chitin
Verified step by step guidance1
Understand the question: Radiolarians are a type of protist known for their intricate and glassy exoskeletons. The question asks about the material that composes these exoskeletons.
Review the options provided: The materials listed are cellulose, silicon dioxide (SiO\(_2\)), calcium carbonate (CaCO\(_3\)), and chitin. Each of these is a distinct biological or chemical substance.
Recall the biological context: Radiolarians are marine organisms that secrete glassy exoskeletons. Glassy structures are typically associated with silicon dioxide (SiO\(_2\)), a compound known for its transparency and rigidity.
Eliminate incorrect options: Cellulose is a carbohydrate found in plant cell walls, chitin is a polysaccharide found in arthropod exoskeletons, and calcium carbonate (CaCO\(_3\)) is commonly found in shells and corals. None of these match the glassy nature of radiolarian exoskeletons.
Conclude that the correct material for radiolarian exoskeletons is silicon dioxide (SiO\(_2\)), based on its glass-like properties and its known association with these organisms.
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