Biochemistry

Question: The immunoglobulin fold is
[A].

found only in IgG molecules

[B].

a β-barrel composed of a three- and a four-stranded antiparallel β-sheet

[C].

both (a) and (b)

[D].

found six times in the IgG molecule

Answer: Option B

Explanation:

No answer description available for this question.

Question: Antibodies of the IgG class
[A].

consist of four subunits

[B].

are glycoproteins

[C].

are secreted into the bloodstream

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: Cleavage of an IgG molecule by a specific protease can produce
[A].

an antigen-binding site and two constant regions

[B].

two heavy chain-light chain dimers

[C].

an inactive mixture of oligopeptides

[D].

two Fab fragments and one Fc fragment

Answer: Option D

Explanation:

No answer description available for this question.

Question: IgE provides
[A].

immunity against some parasites

[B].

complement killings of the cells and phagocytosis

[C].

secretions in the body

[D].

all of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Papain digest IgG into
[A].

two Fab fragments and one Fc fragment

[B].

three Fab fragments and two Fc fragments

[C].

two Fab fragments and two Fc fragments

[D].

three Fab fragments and three Fc fragments

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of those immunoglobulin classes is mainly found in external secretions?
[A].

Ig A

[B].

Ig D

[C].

Ig M

[D].

IgE

Answer: Option A

Explanation:

No answer description available for this question.

Question: The human IgG class of antibodies is divided into
[A].

five IgG classes

[B].

two IgG classes

[C].

three IgG classes

[D].

four IgG classes

Answer: Option D

Explanation:

No answer description available for this question.

Question: Fab fragment has
[A].

one antigen binding site

[B].

two antigen binding site

[C].

one antibody binding site

[D].

two antibody binding site

Answer: Option A

Explanation:

No answer description available for this question.

Question: Each IgA antibody molecule consists of
[A].

four polypeptide chain and has two antigen binding site

[B].

two polypeptide chain and has one antigen binding site

[C].

three polypeptide chain and has two antigen binding site

[D].

two polypeptide chain and has two antigen binding site

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following are responsible for immune specificity?
[A].

Antigens

[B].

Antibodies

[C].

T lymphocytes

[D].

Macrophage

Answer: Option B

Explanation:

No answer description available for this question.