Skin contains

(a) free neuron endings.
(b) encapsulated neuron endings.
(c) no nervous tissue.
(d) both a and b.


(d) both a and b.

Biology & Microbiology

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The glial cells associated with phagocytosis to fight infection and remove debris are the

A) microglia. B) oligodendrocytes. C) Schwann cells. D) myelin sheath cells. E) astrocytes.

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Transformation involves contact between two bacterial cells, followed by the unidirectional transfer of plasmid genes

Indicate whether the statement is true or false.

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Peristalsis

a. is an involuntary smooth muscle response to swallowing. b. is a voluntary smooth muscle response to swallowing. c. is controlled by muscles surrounding the trachea. d. occurs when food enters the airway instead of the esophagus. e. is both b and c.

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Crossing over is one of the most important

events in meiosis because a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. all of these reasons are true

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