Which of the following is not true for a natural killer cell? A do not undergo rearrangement of receptor genes B develop in the thymus stimulated (activated) by IFN-a and other cytokines (D lack of NK cells can lead to severe viral infections Question 6 Represents innate immune system receptors A Randomly arranged B Germline encoded cross-reactive CLP encoded (E) is determined by specific carbohydrate groups

Please answer the following

Which of the following receptor types will trigger the release of cytokines in macrophages? O A. Mannose Receptors B. Scavenger Receptors O C. Glucan Receptors O D. Toll-like Receptors O E. C-type Lectins

Class I major histocompatibility complex molecules are found on O all anucleated cells. O antigen-presenting O all nucleated O None of the choices are correct. QUESTION 67 Important characteristics of antimicrobic drugs include O readily delivered to the site of infection. O high toxicity against microbial cells. O remains active in body tissues and fluids. do not cause serious side effects in humans. O All of these choices are correct. QUESTION 68 Antibodies O can bind to an immunogen. O are part of the nonspecific immune response. O can target the immunogen for destruction. O both can bind to an immunogen and can target the immunogen for destruction. O both can bind to an immunogen and are part of the nonspecific immune response.

In a specific type of tumor, cytotoxic T cells can recognize but not kill the tumor cell. Interaction of PD-L1 in tumor cells with PD1 in cytotoxic T cells plays a role in shaping the immune response by initiating signal transduction cascades in both cell types.  What will happen if the  signal transduction cascade in cytotoxic T cells is blocked?    T cells will be activated and kill tumor cells    T cells can recognize the cancer cells but will not be activated     Tumor cell will undergo programmed cell death