Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex.
B. releasing vesicles containing perforin.
C. activating natural killer cells.
D. opsonization.
E. secreting cytokines.
A. forming the membrane attack complex.
B. releasing vesicles containing perforin.
C. activating natural killer cells.
D. opsonization.
E. secreting cytokines.
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Gymnosperms that produce resin, form male and female cones, and consist of tracheidbased xylem are classified as:
A. conifers. B. ginkgos. C. cycads. D. gnetophytes.
Arrange the steps of antibody-mediated immunity in the proper order
1. Plasma cells secrete antibodies. 2. Helper T cells interact with B cells displaying the same antigen-MHC complex. 3. Contact with antigen. 4. Clones of B cells produced. 5. Fragmentation of antigen.
a. 3, 2, 5, 1, 4 b. 3, 5, 2, 4, 1 c. 1, 3, 5, 2, 4 d. 4, 3, 2, 1, 5 e. 5, 3, 4, 2, 1
is faciliated diffusion carrier mediated or non carrier mediated transport?
What will be an ideal response?
When wind speeds up as it blows over the top of a hill, atmospheric pressure there
What will be an ideal response?