You sit next to Uncle Ed, an immunologist, at Thanksgiving dinner. "I'm a 'big eater'," he says, "just like the cells I study." What are the large cells that engulf pathogens that Uncle Ed works with?
A. Monocytes
B. Antibodies
C. Bacteriophages
D. Macrophages
E. Erythrocytes
Answer: D
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Which of the following components of the lung secretes a lubricating substance that allows the lung tissues to separate when inflated?
A. Bronchial tube B. Capillary endothelium C. Basement membranes D. Respiratory membrane E. Alveolar epithelium
Flowering plants use animals or wind to transfer ________ between flowers.
A. megaspores B. seeds C. pollen D. microspores E. ovules
Pyrogens are
A. fever-inducing substances. B. fever-inhibiting substances. C. phagocytosis-enhancing substances. D. complement activators.
Cell membranes are characterized by the
presence of
a. triglycerides. b. phospholipids. c. unsaturated fats. d. steroids. e. saturated fats.