A hemoglobin molecule contains

A) three protein chains, four heme groups, and two iron ions.
B) two protein chains, two heme groups, and four iron ions.
C) four protein chains, two heme groups, and two iron ions.
D) four protein chains, four heme groups, and four iron ions.
E) four protein chains, six heme groups, and two iron ions.


D) four protein chains, four heme groups, and four iron ions.

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The benefits of ____________________ are weed control, conservation of moisture, and increased

aeration.

Fill in the blank(s) with the appropriate word(s).

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Technician A says that PAFC fuel cells can use hydrogen as fuel. Technician B says that PEM fuel cells can use hydrogen as fuel. Which technician is correct?

A) Technician A only B) Technician B only C) Both technicians A and B D) Neither technician A nor B

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The current flowing into each junction of a parallel circuit ________ the current flow at the junction on the opposite end of that branch

A) Is less than B) Equals C) Is more than D) None of these

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The measurement across the opening of the pipe is referred to as the pipe's

Fill in the blank(s) with the appropriate word(s).

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