Indicate the true statements and correct the false statements so they are true.
a. B cells are activated by antigen-presenting cells.
b. T cytotoxic cells are activated by antigens bound to MHC I.
c. Upon activation, T helper cells stimulate T cytotoxic cells and B cells.
d. IgG is the first antibody made during a primary response.
e. T-dependent antigens rely on TH cells to activate B cells.

Question

Indicate the true statements and correct the false statements so they are true.

a. B cells are activated by antigen-presenting cells.

b. T cytotoxic cells are activated by antigens bound to MHC I.

c. Upon activation, T helper cells stimulate T cytotoxic cells and B cells.

d. IgG is the first antibody made during a primary response.

e. T-dependent antigens rely on TH cells to activate B cells.

Accepted Answer

Hi, everyone. And welcome back. Our next question says, Joe, a seven year old child was infected with measles, which of the following cells would be activated by antigen presenting cells. A dendritic cells, b granulocytes, c monocytes or DT lymphocytes. So we know that when a pathogen abates, you have cells that encounter that new pathogen pros phagocytize it, process it and then present its components on their surface as antigen producing cells or antigen presenting cells. Excuse me. Well, we're not asked about which of the antigen presenting cells saying what cells do they activate? We have to pay attention to that. And that would be choice DT lymphocytes, the choice a dendritic cells are the antigen presenting cells. These are sort of the initial cells that encounter new pathogens and once they have beyti and processed it, they travel to the lymph nodes where they present these antigens from the new pathogen and thereby activate the T lymphocytes that will go on then to activate the B cells and you'll have antibodies and cytotoxic T cells ready to fight that uh infection. So choice A is incorrect because those are the actual antigen presenting cells, not the cells that they're activating choice. B granulocytes. Let's recall there's two types of leukocytes, a granulocytes and granulocytes. And these are not cells activated by antigen presenting cells. These are the basophils. Um These are mainly phagocyte cells to some degree. And of course, some of them are involved in allergic reactions, but they're not activated by androgen presenting cells. So not our answer choice and then choice c monocytes. These are the precursor to macrophages, which are those phagocyte cells. But they also are not cells that are activated by A P CS. Um they mature into macrophages when they arrive at the scene of an infection or where they need to work. So choice c not our correct answer either. So once again, the cells that will be activated by antigen presenting cells are choice DT lymphocytes hope to see you in the next video.

Verified Solution

Key Concepts

B Cell Activation

T Cell Activation

Antibody Response