#Question id: 1985
#Section 2: General Biology
Which of the following is the last line of defense against an extracellular pathogen?
#Question id: 1986
#Section 2: General Biology
The following events occur when a mammalian immune system first encounters a pathogen. Which shows the correct sequence in which they occur?
I. Pathogen is destroyed.
II. Lymphocytes secrete antibodies.
III. Antigenic determinants from pathogen bind to antigen receptors on lymphocytes.
IV. Lymphocytes specific to antigenic determinants from pathogen become numerous.
V. Only memory cells remain.
#Question id: 1987
#Section 2: General Biology
A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to
#Question id: 1987
#Section 2: General Biology
A nonfunctional CD4 protein on a helper T cell would result in the helper T cell being unable to
#Question id: 1988
#Section 2: General Biology
What are CD4 and CD8?
#Question id: 1989
#Section 2: General Biology
Which of the following are T cells of the immune system?