Which of the Following Is True Concerning the Hardness of Porcelain

question 17

Multiple Choice

Which of the following is true concerning the hardness of porcelain relative to enamel and dentin?

• A) Porcelain is harder than enamel and dentin.
• B) Porcelain is harder than enamel but softer than dentin.
• C) Porcelain is harder than dentin but softer than enamel.
• D) Porcelain is softer than enamel and dentin.

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Definitions:

Chloroplast

An organelle found in plant and algae cells where photosynthesis takes place, converting light energy into chemical energy stored in glucose.

Thylakoid Membrane

A membrane-bound compartment inside chloroplasts and cyanobacteria responsible for the light-dependent reactions of photosynthesis.

Stroma

The supportive framework of a biological cell, tissue, or organ, or the fluid-filled inner space of chloroplasts in plants.

Thylakoid Compartment

A component within chloroplasts of plants and algae where the light-dependent reactions of photosynthesis take place.