Which of the following cells recognize the antigens present on the cell surface of the MHC molecules?

Which of the following statement(s) is/are CORRECT for antigen activated effector T cells?
P. CD4+ cells make contact with macrophages and stimulate their microbicidal activity.
Q. CD4+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
R. CD8+ cells make contact with B cells and stimulate them to differentiate into plasma cells.
S. CD8+ cells make contact with virus infected cells and kill them.

A

Q only

B

Q and S only

C

P, Q and S only

D

P, Q, R and S

Which is the correct order of activities showcased by exogenous pathway? i) Generation of MHC class II molecules ii) MHC-peptide transport iii) Class II MHC peptide loading iv) Generation of Peptide from proteolysis

A

i—ii—iii—iv

B

iv—i—iii—ii

C

ii—iii—i—iv

D

i—iii—iv—ii

Which of the following statements about immune response are correct?
P. T cells are activated by antigen-presenting cells.
Q. Foreign peptides are not presented to helper T cells by class II MHC proteins.
R. Dendritic cells are referred to as professional antigenpresenting cells.

A

P and R only

B

P and Q only

C

Q and R only

D

P, Q and R

Which of the following statements are correct regarding common differences between plant and animal cells?
1. Plant cells have cellulose cell wall, while animal cells lack it.
2. Plant cells lack plasma membrane, while animal cells have it.
3. Mature plant cell have a large vacuole, while animal cells have numerous small vacuoles.

A

1 and 2

B

2 and 3

C

1 and 3

D

1, 2 and 3

Which chaperone protein binds to α-chain of Class I MHC molecules to enhance their binding with antigens?

A

Heat shock proteins

B

Calnexin

C

Tapasin

D

Calreticulin

A solid-oxide fuel cell is fed with carbon monoxide and reacts with air to produce CO2. This reaction will produce 2 electrons which are used to power an electric circuit external to the fuel cell. The reaction equation is shown below: 2CO(g) + O2(g) -> 2CO2(g) ΔHr° = -565.96 kJ/mol This reaction does not occur for other types of fuel cells which use a catalyst, such as polymerelectrolyte membrane or phosphoric-acid fuel cells. The presence of carbon monoxide on the anode side of these types of fuel cells will cause catalyst poisoning, reducing the efficiency and voltage of the fuel cell. Determine the rate of enthalpy change for a carbon dioxide production rate of 208 mol/hr. The extent of the reaction occurring in the fuel cell can be obtained by the following equation: where:

A

-16.35 kW

B

-15.35 kW

C

-16.45 kW

D

-15.45 kW

Choose the correct combination of True (T) and False (F) statements about microcarriers used in animal cell culture.
P. Higher cell densities can be achieved using microcarriers.
Q. Microcarriers increase the surface area for cell growth.
R. Microcarriers are used for both anchorage- and non-anchorage-dependent cells.
S. Absence of surface charge on microcarriers enhances attachment of cells.

A

P-T; Q-F; R-T and S-F

B

P-T; Q-T; R-F and S-F

C

P-F; Q-F; R-T and S-T

D

P-F; Q-T; R-F and S-T

MHC molecules are the set of genes that code cell surface proteins essential for _________

A

Innate immunity system

B

Adaptive immunity system

C

Both innate and adaptive systems

D

Coding for proteins is not a function of MHC molecules

Which is the right order of the steps involved in differentiation of T cells? i) Activated T cell generation into blast cell ii) Proliferation of blast cell iii) Differentiation of daughter cells iv) Differentiation into subsets of T cells

A

iii)—ii)—i)—iv)

B

iv)—ii)—iii)—i)

C

i)—ii)—iii)—iv)

D

ii)—i)—iv)—iii)

Which of the following ways is NOT mediated by MHC antigens in order to showcase diversity of antigen presentation?

A

Via multiple interacting genes

B

Via both sets of inherited alleles

C

By variations from organism to organism within a species

D

By expression of same allele within same species

Which of the following cells recognize the antigens present on the cell surface of the MHC molecules?

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