Amino acids are classified into two classes.

A. Strong and weak
B. Big and small
C. Essential and non-essential
D. None of these


Answer: C

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The Class B system, for initiating devices, connects through a two-wire circuit and _________.

A. Does not use an end of line device B. Uses an end of line device C. Is an outdated system no longer used in the United States D. Uses a series limiting resistor

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Which of the following is a common hazardous material on a steel-erection job site?

a. Acetylene b. Graphite c. Asbestos d. Formaldehyde

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In a process called ____________________, fat turns into glycerin

Fill in the blank(s) with correct word

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Which of the following are considered to be "heavy metals" that can contaminate soils and the food chain?

A) lead B) copper C) zinc D) cadmium E) all of the above

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