Phospholipids are important components of the plasma membrane. What does "A" represent on the diagram?
A. Oxygen
B. Polar (hydrophilic) region
C. Nonpolar (hydrophobic) region
D. Nitrogen
E. Phosphorus
Answer: B
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Which of the following statements regarding the migrating motor complex is true?
A. It allows a bolus to move down the esophagus. B. It churns and mixes a bolus with gastric juices. C. It milks the chyme toward the colon. D. It propels pancreatic juice down the pancreatic duct. E. It churns and mixes residue in the descending colon.
What type of tissue lines the trachea?
A. Cuboidal epithelium B. Stratified squamous keratinized epithelium C. Pseudostratified ciliated columnar epithelium D. Simple squamous epithelium E. Stratified squamous nonkeratinized epithelium
Arrange the following in order from largest to smallest: (1) dipeptide (2) protein (3) amino acid (4) polypeptide
A. 3, 1, 4, 2 B. 4, 1, 2, 3 C. 2, 4, 1, 3 D. 1, 2, 3, 4 E. 2, 4, 3, 1
The hearts nodal cells have a more negative resting potential than neurons do, because nodal cells lack leak channels for sodium and potassium ions.
Answer the following statement true (T) or false (F)