The most significant cells in graft rejection are
A. helper T cells.
B. suppressor T cells.
C. cytotoxic T cells.
D. natural killer (NK) cells.
E. delayed hypersensitivity T cells.
Answer: C
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Complex structures called fruiting bodies are a characteristic of
A. Clostridia. B. myxobacteria. C. Streptomyces. D. lactic acid bacteria.
Which cells are located in the brain and spinal cord of vertebrates?
a. interneurons b. motor neurons c. afferent neurons d. efferent neurons e. afferent and efferent neurons
A red blood cell is placed in a solution. After a period of time, the cell has shrunk to half its original size. Which of the
following is true? a. Water moved from the solution into the cell. b. The solution inside the cell is hypertonic. c. The cell was placed in a hypertonic solution. d. The cell was placed in an isotonic solution. e. Salt left the cell resulting in its change in size.
Individuals who are __________ for sickle cell hemoglobin tend to be __________ resistant to
falciparum malaria, but do not experience the effects of sickled red blood cells. a. homozygous dominant; more b. homozygous dominant; less c. homozygous recessive; less d. heterozygous; more e. heterozygous; less