IMMUNE SYSTEM QUIZ

Which of the following is correct for CD8 T cells?

In the thymus, CD8 T cells undergo positive selection only, whereas CD4 T cells undergo negative selection only

CD8 T cells can kill individual virus-infected cells in a contact dependent fashion

CD8 T cell receptor recognizes epitopes that are also commonly recognized by B cells

CD8 T cells only recognize virus-infected cells

TRUE ANSWER : ?
YOUR ANSWER : ?

Chemically an antigen may be

polysaccharide

lipid

any of these

protein

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following(s) is/are the determinants of antigenicity?

All of these

Size of the antigen

Chemical nature

Foreignness

TRUE ANSWER : ?
YOUR ANSWER : ?

Treatment with bacterial endotoxins results blast formation in

none of these

B cells

monocytes

T cells

TRUE ANSWER : ?
YOUR ANSWER : ?

Following are the defenses of the colon except

sIgA

dense resident microbiota

fast flow rate

mucus

TRUE ANSWER : ?
YOUR ANSWER : ?

Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated?

Antibody proteins can physically change their shape to bind different epitopes

By the combination of different heavy and light chains that form the antigen binding site

Both (a) and (b)

By rearrangements of the DNA encoding the variable regions of the heavy and light chains

TRUE ANSWER : ?
YOUR ANSWER : ?

Immunity is not long lasting to

influenza

mumps

whooping cough

diphtheria

TRUE ANSWER : ?
YOUR ANSWER : ?

Natural killer cells are involved in

allograft rejection

all of these

non-specific killing of virus transformed target cells

tumour rejection

TRUE ANSWER : ?
YOUR ANSWER : ?

Macrophages are professional antigen- presenting cells. The protein molecule through which they present antigen in human is

interleukin

CD8

HLA

actin

TRUE ANSWER : ?
YOUR ANSWER : ?

Lysozyme is present in

urine

saliva

Cerebro spinal fluid (CSF)

sweat

TRUE ANSWER : ?
YOUR ANSWER : ?

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