Description : A light chain gene is constructed from the following segments: (A) Variable and constant segments (B) Variable, joining and constant segments (C) Variable, diversity and constant segments (D) Variable, joining, diversity and constant segments
Last Answer : Answer : B
Description : Constant segment genes of heavy chains are present in a cluster in which the first gene on side is (A) Alpha (B) Gamma (C) Delta (D) None of these
Last Answer : Answer : D
Description : Constant segments of heavy chains are of (A) Five types (B) Six types (C) Seven types (D) Eight types
Description : A microarray differs from a gene fusion in that, it A- carries DNA segments from many different genes B- is not constructed by cloning C- gives direct measurement of mRNA level D- all of the above
Last Answer : all of the above
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 : IgG cleaved by papain into (A) Two light and two heavy chains (B) Two Fab and one Fc fragments (C) Two pairs of one light and one heavy chain each (D) One Fab and two Fc fragments
Description : Why is it important for organisms of the same species to have a diversity of genes?
Last Answer : To frustrate parasites. A monoclonal culture is open to devastation to the first good pathogen.
Description : Which of the following statements concerning abnormalities of the haemoglobin molecule is true? 1) Alpha thalassaemia is due to a deficiency of beta-chain production 2) HbS is caused by a ... is an adverse prognostic sign 5) oliguneoclitide probes may assist in the diagnosis of haemoglobinopathies
Last Answer : Answers-2 Alpha Thalassaemia is due to abnormalities of the alpha chain. Persistence of HbF has survival advnatages in severely affected subjects. C-alpha 16, beta 11. e-Hb electrophoresis(Dr Shu Ho)
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 : 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 : Lac operon is a cluster of genes present in (A) Human beings (B) E. coli (C) Lambda phage (D) All of these
Description : Silencer elements (A) Are trans-acting factors (B) Are present between promoters and the structural genes (C) Decrease the expression of some structural genes (D) Encode specific repressor proteins
Last Answer : Answer : C
Description : Non-coding sequence are present in the genes of (A) Bacteria (B) Viruses (C) Eukaryotes (D) All of these
Description : All of the following statements about tRNA are true except (A) It is synthesized as a large precursor (B) It is processed in the nucelolus (C) It has no codons or anticodons (D) Genes for rRNA are present in single copies
Description : How many segments present in thorax ?
Last Answer : How many segments present in thorax ? A. 2 B. 4 C. 1 D. 3
Description : Gamma heavy chains are present in (A) IgA (B) IgG (C) IgM (D) IgD
Description : In addition to undercutting the mica, proper maintenance of a D.C. motor's commutator includes _______________. A. side-cutting the copper segments and insulating the slots B. coating the copper surface with light machine ... in an oven at a maximum of 95°C for not over 8 hours D. all of the above
Last Answer : Answer: A
Description : DNA is (A) Usually present in tissues as a nucleo protein and cannot be separated from its protein component (B) A long chain polymer in which the internucleotide linkages are of the diester type between C-3 ... linkages are between C-2' and C-5' (D) Hydrolyzed by weal alkali (pH9 to 100°C)
Description : A secretory protein T chain (T protein) is present in (A) Ig A (B) Ig M (C) Ig D (D) Ig E
Last Answer : Answer : A
Description : A ‘J’ chain is present in (A) Ig D (B) Ig M (C) Ig G (D) Ig E
Description : Type ε H chain is present in (A) Ig A (B) Ig M (C) Ig D (D) Ig E
Description : Type δ H chain is present in (A) Ig G (B) Ig A (C) Ig M (D) Ig D
Description : Type µ H chain is present in (A) Ig G (B) Ig A (C) Ig M (D) Ig D
Description : Type α H chain is present in (A) Ig E (B) Ig A (C) Ig M (D) Ig D
Description : Type γ H chain is present in (A) Ig G (B) Ig A (C) Ig M (D) Ig D
Description : Which amino acid is present at 6th position of β-chain of Hbs instead of glutamate in HbA? (A) Cysteine (B) Valine (C) Aspartate (D) Glutamate
Description : An –OH group is present in the side chain of (A) Serine (B) Arginine (C) Lysine (D) Proline
Description : Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission? (1) Boron (2) Heavy water (3) Uranium (4) Plutonium
Last Answer : (1) Boron Explanation: Boron shielding is used as a control for nuclear reactors, taking advantage of its high cross-section for neutron capture. Elemental boron is rare and ... aluminium. Crystalline boron is chemicallyinert and resistant to attack by boiling hydrofluoric or hydrochloric acid.
Description : Which of the following can be used to absorb neutrons to control the chain reaction during nuclear fission ? (1) Boron (2) Heavy water (3) Uranium (4) Plutonium
Last Answer : Boron
Description : Antibody diversity arises from (A) Gene amplification (B) Gene re-arrangement (C) Alternative splicing (D) All of these
Description : The immunoglobulins are classified on the basis of (A) Light chains (B) Heavy chains (C) Carbohydrate content (D) Electrophoretic mobility
Description : Immunoglobulins are characterized by their (A) Heavy chains (B) Molecular weight (C) Light chains (D) Electrophoretic behaviour
Description : Bence-Jones protein is (A) An immunoglobulin (B) A dimer of heavy chains (C) A dimer of light chains (D) A dimer of one heavy and one light chains
Description : The effector function of antibody is performed by (A) Variable region of light chains (B) Constant region of heavy chains (C) Variable regions of light and heavy chains (D) Constant regions of light and heavy chains
Description : Recognition of antigen is the function of (A) Variable region of light chains (B) Variable regions of light and heavy chains (C) Constant region of heavy chains (D) Constant regions of light and heavy chains
Description : IgM possesses (A) Two light chains and two heavy chains (B) Four light chains and four heavy chains (C) Six light chains and six heavy chains (D) Ten light chains and ten heavy chains
Description : Immunoglobulins are classified on the basis of (A) Type of light chains (B) Type of heavy chains (C) Types of light and heavy chains (D) Molecular weight
Description : Does the occurrence of diversity of animals on earth suggest their diverse ancestry also? Discuss this point in the light of evolution. -Biology
Last Answer : Discuss this point in the light of evolution. Since animals show a vast diversity in their structures, they probably have diverse ancestry. ... Thus, occurrence of diversity of animals on earth suggest their diverse ancestry also.
Description : The variable region of light chain is the (A) N-terminal quarter (B) N-terminal half (C) C-terminal quarter (D) C-terminal half
Description : $ Those genes which are present on "Y" chromosomes of human beings are called holandric genes. ! Holandric genes are present both in men as well as wo
Last Answer : $ Those genes which are present on "Y" chromosomes of human beings are called holandric genes. ! Holandric ... wrong D. If both As and R are wrong.
Description : $ Those two pairs of genes which if present in dominant stage, do not produce any expression but when present collectively in dominant stage, produce
Last Answer : $ Those two pairs of genes which if present in dominant stage, do not produce any expression but when ... wrong D. If both As and R are wrong.
Description : The eukaryotic genome differs from the prokaryotic genome because (a) the DNA is complexed with histone in prokaryotes (b) the DNA is circular and single stranded in prokaryotes (c) repetitive sequences are present in eukaryotes (d) genes in the former case are organised into operons.
Last Answer : (b) the DNA is circular and single stranded in prokaryotes
Description : Two non-allelic genes produces the new phenotype when present together but fail to do so independently then it is called (a) epistasis (b) polygene (c) non complementary gene (d) complementary gene.
Last Answer : epistasis
Description : Which of the following statements is not true of two genes that show 50% recombination frequency? (a) The gene show independent assortment. (b) If the genes are present on the same chromo- some, they ... every meiosis. (c) The genes may be on different chromosomes. (d) The genes are tightly linked.
Last Answer : (b) If the genes are present on the same chromo- some, they undergo more than one cross-overs in every meiosis.
Description : In a test cross involving F1 dihybrid flies, more parental-type offspring were produced than the recombinant-type offspring. This indicates (a) the two genes are linked and present on the ... two genes are located on two different chromosomes (d) chromosomes failed to separate during meiosis.
Last Answer : (a) the two genes are linked and present on the same chromosome
Description : The frequency of recombination between gene present on the same chromosome as a measure of the distance between genes was explained by (a) Sutton Boveri (b) T.H. Morgan (c) Gregor J.Mendel (d) Alfred Sturtevant.
Last Answer : (d) Alfred Sturtevant.
Description : The binding of prokaryotic DNA dependent RNA polymerase to promoter sits of genes is inhibited by the antibiotic: (A) Streptomycin (B) Rifamcin (C) Aueromycin (D) Puromycin
Description : Which of the following genes of the E.coli “Lac operon” codes for a constitutive protein? (A) The ‘a’ gene (B) The ‘i’ gene (C) The ‘c’ gene (D) The ‘z’ gene
Description : Genes are (A) RNA (B) DNA (C) lipoproteins and (D) Chromoproteins
Description : Lac operon of E. coli contains _______ is continuity. (A) Regulator and operator genes only (B) Operator and structural genes only (C) Regular and structural genes only (D) Regulator, operator and structural genes