Which of these statements best demonstrates the difference between the action of B cells and T cells during an immune response? O B cells carry out the cell-mediated response; cytotoxic T cells carry out the humoral response B cells confer active immunity; cytotoxic T cells confer passive immunity B cells respond the first time a pathogen in present; cytotoxic T cells respond all subsequent times B cells secrete antibodies against a pathogen; cytotoxic T cells kill pathogen-infected host cells

Food-derived retinoic acid and commensal bacteria stimulate all three populations of innate lymphoid ells(ILC, ILC2, ILC3) to cause T cell inactivation (anergy) and regulatory T cell (Treg) formation. True False

Which of the following is true about the adaptive immune system? Check all please. Adaptive immunity develops several days after the initial infection, but eliminate pathogens in a specific manner and is saved as memory to encounter the same reinfection Adaptive immunity is improved with repeated infections with the same pathogen A robust primary adaptive immunity can be generated in the absence of innate immunity Adaptive immune cells are B cells that make antibodies and T cells that eliminate infected cells and make cytokines Dendritic cells present antigens to T cells, whereas macrophages present antigens to B cells.

Which of the following immune responses is NOT considered as the first line of defense or innate immune response? O Inflammation Immunoglobulin O Interferon Natural killer cells

Where would you expect to find activated T cells and B cells? Group of answer choices Mainly in bone marrow Only in lymph nodes and the spleen In blood, lymph, or infected / damaged tissues Mainly in the thymus

(>1 ans) Which of the following are true CD4+ T cell count is used to monitor immune system function in HIV-positive people AIDS patients have an increased risk of developing various cancers HIV-1 infection causes immune deficiencies The most clinically important retrovirus is HIV-1 HIV-1 is an enveloped virus

What is a lymphocyte central to adaptive immunity that targets infected or cancerous body cells?     Macrophage   Dendritic cell   B cell   T cell

A A person has a disease that has activated the first line of defense. Which of the following defense mechanisms would be activated in the first line of defense? O Innate immunity and the skin (dendritic cells) O Innate immunity and Complement System Adaptive immunity and Antibodies O Adaptive immunity and TLRS Question 4 There are two types of inflammatio O Acute MacBook Air