Question

which cells of the immune system are the primary targets of the hiv virus?
helper t cells
cytotoxic t cells
b cells
antigen presenting cells
question 7 (1 point)
peptic ulcers can have several causes, but this acidophilic bacteria is a classic cause for them.
listeria monocytogenes
bacillus anthracis
streptococcus pyogenes
helicobacter pylori

Explanation:

First Question (HIV target cells)

HIV primarily targets helper T cells (CD4+ T cells) as they have CD4 receptors that the virus uses to enter, disrupting immune function. Cytotoxic T cells kill infected cells, B cells make antibodies, and antigen - presenting cells present antigens; none are the primary HIV target like helper T cells.

Peptic ulcers are classically caused by Helicobacter pylori, an acid - tolerant (acidophilic) bacterium. Listeria monocytogenes causes listeriosis, Bacillus anthracis causes anthrax, and Streptococcus pyogenes causes strep throat and other infections, not peptic ulcers.

Answer:

helper T cells

Question 7 (Peptic ulcer cause)