Cytotoxic T cells destroy target cells by
A. the CD95 pathway.
B. the perforin pathway.
C. direct killing mediated by activated oxygen species.
D. both direct killing mediated by activated oxygen species and the perforin pathway.
E. both the perforin pathway and the CD95 pathway.
Answer: E
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The first group to exhibit an amniotic egg was
the a. Aves. b. Amphibia. c. Reptilia. d. Osteichthyes. e. Mammalia.
Which bone completely surrounds the foramen magnum?
a. frontal b. mandible c. sphenoid d. temporal e. occipital
The inheritance pattern demonstrated by the pedigree in accompanying figure is:
a. autosomal recessive. b. autosomal dominant. c. X-linked recessive. d. X-linked dominant. e. undeterminable from these data.
A contaminated food sample contains several different species of bacteria. A food microbiologist is interested in studying just one of these species. Describe the sequence of procedures that the microbiologist must perform in order to obtain a pure culture of the bacterial species of interest from this food sample. Detail all the necessary media and equipment.
What will be an ideal response?