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Pre-Test
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1
The endocrine system coordinates body parts by using chemical signals called _____.
A)antibodies
B)hormones
C)pheromones
D)enzymes
2
There are _____ basic classes of hormones.
A)two
B)three
C)four
D)six
3
Steroid hormones are _____.
A)lipids
B)carbohydrates
C)nucleic acids
D)proteins
4
Peptide hormones bind to a receptor _____.
A)in the plasma membrane
B)inside the cytoplasm
C)inside the nucleus
5
Which of the following is a second messenger?
A)Chlorine
B)Cyclic AMP
C)ADH
D)None of these





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