Microorganisms and Disease
Which of the following statements is not true regarding Mycobacterium tuberculosis and/or the disease it causes?

The pathogen contains mycolic acid in its cell wall
The pathogen can live inside macrophages
Antibodies to the pathogen are protective
None of these

ANSWER DOWNLOAD EXAMIANS APP

Microorganisms and Disease
The "A" subunit of diphtheria toxin

forms cAMP that leads to fluid accumulation
lysis macrophages with the release of cytokines
cause ADP ribosylation of a factor involved in protein synthesis
binds host cell receptors found on heart cells

ANSWER DOWNLOAD EXAMIANS APP

Microorganisms and Disease
Type III secretion systems are used to inject "effector" proteins directly into a host cell. Salmonella uses a type III secretion system to help the pathogen to

secrete LT (heat labile toxin) and ST (heat stable toxin) into the lumen of the intestine
survive within macrophages
activate T cells to proliferate and secrete cytokines
survive the acid pH of the stomach

ANSWER DOWNLOAD EXAMIANS APP