Question

question 15
2.5 pts
what types of cells does cytotoxic t cells target? choose all that apply
☐ virally infected cells
☐ cancer cells
☐ cells from other animals and humans
☐ bacterial cells
question 16
2.5 pts
which fragment of the immunoglobulin serves as an anchor?
○ fab
○ fc
○ hypervariable region

Explanation:

Question 15

Cytotoxic T cells target cells that are infected (like virally infected cells) or abnormal (like cancer cells). They don't target normal cells from other organisms or bacterial cells (bacteria are handled more by other immune components like phagocytes or antibodies). So virally infected cells and cancer cells are the targets.

The Fc (Fragment crystallizable) region of an immunoglobulin (antibody) serves as an anchor, binding to Fc receptors on immune cells or other molecules. Fab is for antigen binding, and the hypervariable region is part of Fab for specific antigen recognition.

Answer:

A. virally infected cells, B. cancer cells

Question 16