Titer refers to
a. The most concentrated antigen-antibody concentration
showing a reaction.
b. The first diluted antigen-antibody concentration showing a
reaction.
c. The precipitation line formed between an antigen-antibody
reaction.
d. The most dilute antigen-antibody concentration showing a
reaction.

1 Answer

Answer :

d. The most dilute antigen-antibody concentration showing a
reaction.

Related questions

Description : In which of the following case a large lattice is formed? A.Antibody is in excess B.Antigens and antibodies are in optimal proportion C.Antigen is in excess D.None of these

Last Answer : B.Antigens and antibodies are in optimal proportion

Description : In which of the following case a large lattice is formed? A.Antibody is in excess B.Antigens and antibodies are in optimal proportion C.Antigen is in excess D.None of these

Last Answer : B.Antigens and antibodies are in optimal proportion

Description : Reaction of soluble antigen with antibody is ____A. Agglutination B. Precipitation C. Flocculation D. CFT

Last Answer : Precipitation

Description : When antigens are attached to the surface of latex beads and then reacted with an appropriate antibody, a/an reaction occurs. a. Inhibition b. Agglutination c. Neutralization d. Precipitation

Last Answer : b. Agglutination

Description : An antigen binding site on the IgG antibody is a combination of a. One variable region from a light chain and one from a heavy chain. b. Two variable regions from two light chains. c. Two ... from two heavy chains. d. One variable region from a constant region and one from a variable region.

Last Answer : a. One variable region from a light chain and one from a heavy chain.

Description : Clonal selection includes a. Antigen-receptor binding on B cells. b. Antibody secretion recognizing same epitope as on B cell receptors. c. Differentiation of B cells into plasma cells and memory cells. d. All the above (A—C) are correct.

Last Answer : d. All the above (A—C) are correct.

Description : Numerous antibodies can be prepared, against one antigen, each binds to unique epitopes. How is this antibody diversity generated? A- By rearrangements of the DNA encoding the variable regions of the heavy ... proteins can physically change their shape to bind different epitopes D- Both (a) and (b)

Last Answer : Both (a) and (b)

Description : Severe combined immunodeficiency disease refers to a condition wherein a patient a. Cannot produce T and B cells. b. Interferon. c. Antigen-presenting cells. d. Hydrogen peroxide in phagocytes

Last Answer : a. Cannot produce T and B cells.

Description : On exposure to any antigen, the first antibody to be formed is of the following class: (A) IgA (B) IgG (C) IgM (D) IgE

Last Answer : Answer : C

Description : A cell-coded protein that is formed in response to infection, with most animal viruses, is called (a) histone (b) antibody (c) interferon (d) antigen.

Last Answer : (c) interferon

Description : The following statement(s) is/are true concerning newer detection methods of systemic infection. a. Enzyme-linked immunosorbent assay (ELISA) is a rapid immunologic assay used for ... detected using advanced molecular techniques include cytomegalovirus (CMV) and human immunodeficiency virus (HIV)

Last Answer : Answer: a, b, c, d Although the classic detection of infection based on clinical signs of infection and bacterial culture remain the most common clinical tools, increasing ... including CMV and HIV. Furthermore, preliminary investigations into possible detection of fungal pathogens are underway

Description : In a patient of bronchial asthma, inhaled salbutamol produces the following effect(s). (a) Inhibits antigen-antibody reaction in the lungs (b) Causes bronchodilatation (c) Reduces bronchial hyperreactivity (d) Both (b) and (c)

Last Answer : Ans: B

Description : The drug that can directly release histamine from mast cells without involving antigen-antibody reaction is: A. Aspirin B. Procaine C. Morphine D. Sulfadiazine

Last Answer : C. Morphine

Description : In a patient of bronchial asthma, inhaled salbutamol produces the following effect(s): A. Inhibits antigen-antibody reaction in the lungs B. Causes bronchodilatation C. Reduces bronchial hyperreactivity D. Both ‘B’ and ‘C’ are correct

Last Answer : B. Causes bronchodilatation

Description : The drug that can directly release histamine from mast cells without involving antigen-antibody reaction is: A. Aspirin B. Procaine C. Morphine D. Sulfadiazine

Last Answer : C. Morphine

Description : Effector functions of antigen antibody reaction

Last Answer : 1) As two or more Fc portions are required to stimulate effector functions so effector functions are carried out only by molecules with bound antigens and not with free Ig. 2) Fc region of ... chains are called isotypes. Five heavy chain isotypes and two light chain isotypes are present in humans. 

Description : Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in (A) Viscosity with concentration (B) Degree of ideality of the solution (C) Both (A) and (B) (D) Neither (A) nor (B)

Last Answer : (C) Both (A) and (B)

Description : Diffusion in concentrated solutions differs from that in dilute solutions, because of the change in the __________ with the concentration of the solution. (A) Degree of ideality (B) Viscosity (C) Both 'a '& 'b' (D) Neither 'a' nor 'b'

Last Answer : (C) Both 'a '& 'b

Description : Freundlich equation applies to the adsorption of solute from (A) Dilute solutions, over a small concentration range (B) Gaseous solutions at high pressure (C) Concentrated solutions (D) None of these

Last Answer : (A) Dilute solutions, over a small concentration range

Description : Most commonly employed test for determining the antibody titers for Newcastle disease infection in B A. Agar gel precipitation test B. Hemagglutination inhibition C. Polymerase chain reaction D. None of these

Last Answer : Hemagglutination inhibition

Description : Most commonly employed test for determining the antibody titers for AI infection is B A. Agar gel precipitation test B. Hemagglutination inhibition C. Polymerase chain reaction D. None of these

Last Answer : Hemagglutination inhibition

Description : A dilute solution of `H_(2)SO_(4)` is made by adding 5 mL of `3N H_(2)SO_(4)` to 245 mL of water. Find the normality and molarity of the diluted solut

Last Answer : A dilute solution of `H_(2)SO_(4)` is made by adding 5 mL of `3N H_(2)SO_(4)` ... of water. Find the normality and molarity of the diluted solution.

Description : If Henle’s loop were absent from mammalian nephron, which one of the following is to be expected? (a) There will be no urine formation. (b) There will be hardly any change in the quality and quantity of urine formed . (c) The urine will be more concentrated. (d) The urine will be more dilute.

Last Answer : (d) The urine will be more dilute.

Description : The serological reaction where antigens and antibodies form an extensive Lattice of large particles is called a. Fixation. b. Precipitation. c. Neutralization. d. Agglutination.

Last Answer : c. Neutralization.

Description : _______ is a serological reaction that produces Little or no visible evidence of a reaction. a. Precipitation b. ELISA c. NeutraLization d. Agglutination

Last Answer : a. Precipitation

Description : Concentrated sulphuric acid is always diluted by adding which thing? -Do You Know?

Last Answer : answer:

Description : Removal of proximal convoluted tubule from the nephron will result in (a) no change in quality and quantity of urine (b) no urine formation (c) more diluted urine (d) more concentrated urine.

Last Answer : (c) more diluted urine

Description : Concentrated sulphuric acid is always diluted by adding which thing?

Last Answer : Acid to water

Description : The reaction of zinc with dilute and concentrated nitric acid, respectively, produce

Last Answer : The reaction of zinc with dilute and concentrated nitric acid, respectively, produce A. `NO_(2) and NO` B. `NO and ... N_(2)O` D. `N_(2)O and NO_(2)`

Description : The reaction of zinc with dilute and concentrated nitric acid, respectively, produce

Last Answer : The reaction of zinc with dilute and concentrated nitric acid, respectively, produce A. `NO_(2) and NO` B. `NO and ... N_(2)O` D. `N_(2)O and NO_(2)`

Description : What is the difference between an antibody and an antigen?

Last Answer : A: An antigen is any substance that can elicit an immune response, while an antibody is a protein produced by the immune system in response to an antigen that binds specifically to that antigen to help neutralize or eliminate it from the body.

Description : Which of the following is based upon the principle of antigen - antibody interaction?

Last Answer : Which of the following is based upon the principle of antigen - antibody interaction? A. PCR B. ELISA C. r-DNA technology D. RNA

Description : Antigen binding site in an antibody is found between:

Last Answer : Antigen binding site in an antibody is found between: A. two light chains B. two heavy ... one light chain depending upon the nature of antigen

Description : The antigen -binding sites are present where on the antibody molecule

Last Answer : The antigen -binding sites are present where on the antibody molecule A. on light chain as well as ... region of light chain D. on heavy chain only

Description : Antigen binding site in an antibody is found between:

Last Answer : Antigen binding site in an antibody is found between: A. two light chains B. two heavy ... one light chain depending upon the nature of antigen

Description : The alternate complement pathway doesn’t involve (A) Antigen-antibody complex (B) Complement 3 (C) Factors B and D (D) Membrane attack unit

Last Answer : Answer : A

Description : Antigens and haptens have the following similarity: (A) They have high molecular weights (B) They can elicit immune response by themselves (C) They can elicit an immune response only in association ... ) Once an immune response develops, free antigen and free hapten can be recognized by the antibody

Last Answer : Answer : D

Description : The portion of the antigen molecule which is recognized by antibody is known as (A) Hapten (B) Epitope (C) Complement (D) Variable region

Last Answer : Answer : B

Description : Which of the following statement(s) is/are true concerning the antibody response to an invading antigen? a. All antibodies are composed of one type of heavy and one type of light protein chain b. ... stimulus d. Immunoglobulins A, D, and E play an active role in the circulating humoral response

Last Answer : Answer: a Humoral defenses consist of antibody (immunoglobulin; Ig) and complement. All Ig classes (IgM, IgG, IgA, IgE, IgD) and IgG subclasses are composed of one type (M, G, A, E, D ... exist in smaller amounts in the circulation and do not appear to play a major role as host defense components

Description : What is an antigen and antibody interaction ?

Last Answer : Antigen-antibody interaction is similar to an enzyme substrate interaction. The reaction between antigen and antibody occurs in two stages. Primary stage is the initial interaction of antigen-antibody ... as precipitation, lysis of cells, neutralization of toxins and fixation of compliments etc.

Description : Give some general features of antigen-antibody interaction ?

Last Answer : The reaction is specific and antigen combines only with its corresponding antibody and vice versa. Entire molecules react but not the fragment. There is no denaturation of antigen or ... reactions. Antigens and antibodies can combine in various proportions unlike chemicals with fixed valancy.

Description : What are the forces that are responsible for antigen-antibody reactions ?

Last Answer : The process that holds antigen-antibody together is called non-specific interactions. Inter molecular forces may be classified into four- Electrostatic bonds Hydrogen bonds Hydrophobic interactions Vander Val interactions

Description : Explain in brief about electrostatic bonds in antigen-antibody interaction ?

Last Answer : These are formed due to the attraction between opposite charged protein side chains.

Description : Explain in brief about hydrogen bonds antigen-antibody interaction ?

Last Answer : Reversible hydrogen bonds are formed between hydrophilic groups such as hydroxyl, amino and carboxylic group. Although hydrogen bonds are relatively weak, they play an important role in interaction of antigen-antibody.

Description : Explain in brief about hydrophobic interactions in antigen-antibody interaction ?

Last Answer : Contribute up to 50% of the total strength of antigen- antibody interactions. These reactions are found when ever the side chains of non-polar amino acids of antigen-antibody come together.

Description : Explain in brief about Vander Val interactions in antigen-antibody interaction ?

Last Answer : Temporary transfer of electrons from one molecule to another will result in the force of attraction between them. This is seen when the interacting molecules come close to each other.

Description : Into how many types is antigen-antibody reactions are broadly classified ?

Last Answer : It is broadly classified into five- Precipitation Agglutination Complement fixation Immunoassay using labeled reagents Immunohistrochemistry (Immunoflourescence)