What Makes Emery Different from Corundum

question 34

Multiple Choice

What makes emery different from corundum?

• A)Impure micro-crystals make up corundum.
• B)Impure micro-crystals make up emery.
• C)Corundum is almost pure silicate.
• D)Emery is almost pure silicate.
• E)Nothing; they are actually the same material.

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Definitions:

Transcription Factors

Proteins that regulate the transcription of genes by binding to DNA sequences.

Humus

Organic matter in various stages of decomposition in the soil; gives soil a dark brown or black color.

Prop Root

An adventitious root that arises from the stem and provides additional support for a plant such as corn.

Buttress Root

A bracelike root at the base of certain trees that provides upright support.