Exam 3 MCQs Final with
questions and well verified
answers actual exam!!!
2026
Which of the following is correct regarding the body's interferon defense system? -
ANSWER -A — Interferon induces the production of antiviral proteins in adjacent cells.
What parts of antibodies have great variability due to somatic recombination? -
ANSWER -B — the Fab part only
Some bacteria have evolved the ability to prevent lysosome fusion to a phagosome. These
bacteria can therefore avoid ____. - ANSWER -B — the oxidative burst
What is meant by the abbreviation ADCC? - ANSWER -D — Tagging a cell so that NK cells
bind to and destroy it
Immune tolerance in T cells involves positive selection. What does that mean? -
ANSWER -E — T cells are only released if their TCR recognizes thymus cells' MHC1.
The three complement activation systems share many common features, but there are also
differences. Which of the following is NOT common to all three complement pathways? -
ANSWER -E — Properdin is required to stabilize the C5 convertase.
, Why are only a very small number of B cells activated in response to an infection? -
ANSWER -A — Only a few B cells bind to both the specific antigen and a TH cell.
How do Treg cells differ from TH cells? - ANSWER -E — Treg cells recognize self-antigens
in addition to foreign ones.
Injection of a patient with tetanus immune globulin is an example of ____. - ANSWER -D
— artificial, passive immunity
What can you conclude if you find the structure at the right in a patient? - ANSWER -B —
This is at least the second time the patient has had the same disease.
Pharmaceutical companies are developing DNA-based and mRNA-based vaccines. These
vaccines work by causing a vaccinated person to ____. - ANSWER -D — produce one of a
pathogen's proteins in order to elicit a T cell response
Inheritance of the immunodeficiency disease agammaglobulinemia results in the failure to
produce B cells. A patient with this disease would ____. - ANSWER -B — Be very
susceptible to bacterial toxins
A patient with pneumonia arrives at a doctor's office. The titer for anti-Legionella IgG is 1:32.
The patient recovers and the doctor runs another IgG titer. If the pneumonia had been caused
by Legionella, which antibody titer might the doctor expect to find? - ANSWER -B —
1:256
What type of cells do NK cells kill? - ANSWER -D — mainly cancer cells and virally
infected cells
When we say that a patient has a "disseminated" bacterial infection, what can we assume? -
ANSWER -C — The patient has or has had bacteremia.
Which of the following is true for a direct ELISA, but not for an indirect ELISA? -
ANSWER -E — To begin the test, known antibodies are bound to the bottom of a
microtiter well.
questions and well verified
answers actual exam!!!
2026
Which of the following is correct regarding the body's interferon defense system? -
ANSWER -A — Interferon induces the production of antiviral proteins in adjacent cells.
What parts of antibodies have great variability due to somatic recombination? -
ANSWER -B — the Fab part only
Some bacteria have evolved the ability to prevent lysosome fusion to a phagosome. These
bacteria can therefore avoid ____. - ANSWER -B — the oxidative burst
What is meant by the abbreviation ADCC? - ANSWER -D — Tagging a cell so that NK cells
bind to and destroy it
Immune tolerance in T cells involves positive selection. What does that mean? -
ANSWER -E — T cells are only released if their TCR recognizes thymus cells' MHC1.
The three complement activation systems share many common features, but there are also
differences. Which of the following is NOT common to all three complement pathways? -
ANSWER -E — Properdin is required to stabilize the C5 convertase.
, Why are only a very small number of B cells activated in response to an infection? -
ANSWER -A — Only a few B cells bind to both the specific antigen and a TH cell.
How do Treg cells differ from TH cells? - ANSWER -E — Treg cells recognize self-antigens
in addition to foreign ones.
Injection of a patient with tetanus immune globulin is an example of ____. - ANSWER -D
— artificial, passive immunity
What can you conclude if you find the structure at the right in a patient? - ANSWER -B —
This is at least the second time the patient has had the same disease.
Pharmaceutical companies are developing DNA-based and mRNA-based vaccines. These
vaccines work by causing a vaccinated person to ____. - ANSWER -D — produce one of a
pathogen's proteins in order to elicit a T cell response
Inheritance of the immunodeficiency disease agammaglobulinemia results in the failure to
produce B cells. A patient with this disease would ____. - ANSWER -B — Be very
susceptible to bacterial toxins
A patient with pneumonia arrives at a doctor's office. The titer for anti-Legionella IgG is 1:32.
The patient recovers and the doctor runs another IgG titer. If the pneumonia had been caused
by Legionella, which antibody titer might the doctor expect to find? - ANSWER -B —
1:256
What type of cells do NK cells kill? - ANSWER -D — mainly cancer cells and virally
infected cells
When we say that a patient has a "disseminated" bacterial infection, what can we assume? -
ANSWER -C — The patient has or has had bacteremia.
Which of the following is true for a direct ELISA, but not for an indirect ELISA? -
ANSWER -E — To begin the test, known antibodies are bound to the bottom of a
microtiter well.
