A patient's serum is analyzed and found to have an abnormally low level of CD8 molecules. This suggests that the
patient has insufficient numbers of ____.
a. macrophages
b. B cells
c. cytotoxic T cells
d. helper T cells
e. NK cells
ANSWER: c
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Why is possible to detect the mutation causing Huntington disease at any age?
A) It is possible to detect the mutation causing Huntington disease at any age because it is a single-gene disorder. B) It is possible to detect the mutation causing Huntington disease at any age because it affects consecutive generations. C) It is possible to detect the mutation causing Huntington disease at any age because it is caused by the mutation of linked genes. D) It is possible to detect the mutation causing Huntington disease at any age because it is influenced by the immediate environment.
All of the following statements about the periplasmic space are true except:
A. It contains hydrolytic enzymes and binding proteins involved in nutrient acquisition. B. It is located between the plasma membrane and outer membrane of gram-negative bacteria. C. It is found only in gram-positive bacteria. D. All of the choices are true.
Dialysis is a treatment that can replace kidney function in some patients with kidney failure, while they await transplantation. Based on your knowledge of kidney function, how do you expect dialysis to work?
A) Dialysis extracts metabolic wastes from the blood. B) Dialysis exchanges gases between the blood and the atmosphere. C) Dialysis delivers nutrients to the blood. D) Dialysis produces heat in the blood.
Where is the nucleus of a neuron found?
A. companion cell B. myelin sheath C. dendrites D. axon branches E. cell body