The attraction or repulsion of certain cells to chemicals in their environment is called
A) chemotaxis.
B) diapedesis.
C) phagocytosis.
D) apoptosis.
E) immune surveillance.
Answer: A
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Which of the following statements regarding endocytosis and exocytosis is correct?
A. Endocytosis is a method by which large molecules may be secreted from a cell. B. Exocytosis is a method by which large molecules may be secreted from a cell. C. Pinocytosis is a form of endocytosis; phagocytosis is a type of exocytosis. D. Pinocytosis is a form of exocytosis; phagocytosis is a type of endocytosis. E. Pinocytosis and phagocytosis are both types of exocytosis.
Abnormally slow depolarization of the ventricles would most change the shape of the ________ in an ECG tracing
A) P wave B) T wave C) QRS complex D) P-R interval E) R-T interval
The second energy level of an atom:
a. has four orbitals b. can hold eight electrons c. is a lower energy level then the first energy level d. both A and B above
The portion of a hair that protrudes above the surface of the skin is the ________.
A. hair shaft B. hair bulb C. hair follicle D. hair root E. dermal papilla