The layer of hard keratin that acts as the surface of the hair is termed the
A) medulla.
B) cuticle.
C) hair bulb.
D) root.
E) shaft.
B
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Arsenic poisoning harms the body by
A. rotting the teeth. B. unraveling the DNA double helix. C. forming more sulfur bonds in proteins. D. interfering with cellular extraction of energy from glucose.
The muscle cells of a marathon runner's legs would exhibit all these characteristics except
a. high resistance to fatigue b. low myoglobin content c. low glycogen content d. many mitochondria e. slow speed of contraction
Intestinal blood enters the inferior side of the liver by way of the ________ vein.
A. inferior mesenteric B. splenic C. hepatic D. right gastro-omental (gastroepiploic) E. hepatic portal
Identify structure "A" on the neuron
A. Schwann cell B. Node of Ranvier C. neuron cell body (soma) D. dendrites E. axon