Tag: antigen and antibody

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Questions Related to antigen and antibody

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

Which statement is correct?

  1. Antibodies are formed by mast cells

  2. B-lymphocytes are matured in thymus

  3. Histamine acts as inflamatory mediator

  4. CMI is mediated by B-lymphocytes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Mast cells are coated with IgE, which is produced by plasma cells (the antibody-producing cells of the immune system). IgE antibodies are typically specific to one particular antigen. In allergic reactions, mast cells remain inactive until an allergen binds to IgE already coated upon the cell.

So, the correct option is 'Antibodies are formed by mast cells'.

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

................  is associated with allergic reactions

  1. IgE

  2. IgG

  3. IgA

  4. IgM
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Antibodies are the immunoglobulins which are produced in response to the antigen. The immunoglobulin E antibodies or IgE binds to an allergen and trigger the release of inflammatory chemicals such as histamine.
Therefore, the correct answer is option A.

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

Select the correct statement with respect to diseases and immunisation.

  1. If due to some reason B and T-Lymphocytes are damaged, the body will not produce antibodies against a pathogen.

  2. Injection of dead or inactivated pathogens causes passive immunity.

  3. Certain protozoans have been used to mass produce hepatitis B vaccine.

  4. Injection of snake antivenom against snake bite is an example of active immunisation.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Clone of B-cells is called as plasma cells which produce antibodies. Helper T-cells secrete IL-2 (interleukin-2) which stimulate B cells to produce antibodies. For example iInjection of snake antivenom against snake bite that provides artificially acquired passive immunity. Thus, the correct answer is option A.

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

A substance produced by the host in response to an infection or foreign structure is 

  1. Antigen

  2. Toxin

  3. Hormone

  4. Antibody
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

An antibody is a type of proteinaceous substance produced by the body's immune system when it detects harmful substances called antigens. Examples of antigens include microorganisms (bacteria, fungi, parasites and viruses) and chemicals. Each type of antibody is unique and defends the body against one specific type of antigen.

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

Antibodies are secreted by

  1. T-lymphocytes

  2. B-lymphocytes

  3. Both A and B

  4. Natural killer cell
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An antibody or immunoglobulin is a  proteinaceous compound produced mainly by differentiated plasma cells i.e., B lymphocytes. It is used by the immune system to identify and neutralize pathogens such as bacteria and viruses. Thus, the correct answer is option B.

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

Shape of antibody is

  1. Y shaped

  2. S shaped

  3. T shaped

  4. R shaped
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • Antibodies are the Y-shaped proteinaceous compound. Each is made up of 2 heavy chains and 2 light chains. 
  • An antibody is made up of a variable region and a constant region, and the region that changes to various structures depending on differences in antigens is called the variable region, and the region that has a constant structure is called the constant region.

    Hence, option A is correct.
Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

A person who has been infected with a virus in the past can be determined by the presence of

  1. Antigens

  2. Antibodies

  3. Macrophages

  4. Pathogens

  5. Natural killer cells
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The encounter of B cell with a specific antigen activates its clonal expansion which in turn gives rise to plasma cell and memory cells.  Memory cells are the B cells (antibodies) responsible for long-term immunity and confirm the previous encounter of a person with the specific virus. Antigens are foreign substances that induce the immune system to produce antibodies. Disease-causing organisms are called as pathogens. Natural killer cells and macrophages are components of immune system. So, the correct answer is option D.

Multiple choice bio-chemistry diseases and immunity antibodies antibodies and antitoxin antigen and antibody

Antibodies in are complex

  1. Prostaglandins

  2. Glycoproteins

  3. Lipoproteins

  4. Steroids
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

An antibody is a protein which is produced in response to the antigen by the plasma cells. Antibodies are $\gamma$-globulin proteins that have sugar groups attached to amino acid chains. They can be classified as glycoproteins. These are y-shaped. So, the correct answer is option B.