Which of the following is part of the appendicular skeleton?
a. The sacrum
b. The sternum
c. The pelvic girdle
d. The hyoid bone
c. The pelvic girdle
The pelvic girdle is part of the appendicular skeleton.
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Indicate whether the statement is true or false.
In what way are vitamins and essential amino acids similar in human metabolism?
A. Both are integral parts of membrane lipids. B. They cannot be synthesized and must be ingested. C. Both are needed to synthesize steroid hormones. D. They are derived from the same precursor molecules. E. Both contain metal ions.
Air movement to the mammalian respiratory surfaces can be reduced when smooth muscle in the walls
of the ____ contract(s).
a. epiglottis b. bronchioles c. large bronchi d. trachea e. aorta
The operon segment composed of the gene that codes for a protein repressor is called the ________.
A. regulator B. structural locus C. operator D. promoter