Which statement is FALSE with regard to proteins?
A. Their roles in the body include acting as enzymes, providing structural support, and signaling between cells.
B. They are macromolecules with subunits linked by polypeptide bonds.
C. They are polymers made up of amino acids.
D. They are composed of nucleic acids.
E. They make up a greater percentage of body mass than carbohydrates do.
Answer: D
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Ribs that attach individually to the sternum by way of the costal cartilage are:
a. true ribs b. false ribs c. floating ribs d. none of the above
Irving, who is 78 years old, takes human growth hormone supplements to regain the
strength of his youth. He may be disappointed, because the hormone has been shown only to A) make him urinate more often. B) decrease fat and increase muscle mass, but not improve strength. C) increase his risk of cancer. D) increase the red blood cell supply.
Which of the following muscle types are myogenic?
a. cardiac muscle b. single-unit smooth muscle c. multi-unit smooth muscle d. Both a and b e. Both b and c
Which of the following is NOT true?
a. When the dorsal respiratory group stops firing, expiration occurs. b. The ventral respiratory group becomes active during periods of increased ventilation. c. In mammals it is thought ventilation rhythm is established in the pre-Botzinger complex. d. The pneumotaxic center sends impulses to the dorsal respiratory group that help switch on the inspiratory neurons. e. None of these.