MCQOPTIONS
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MCQOPTIONS
This section includes 91 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
β-Lymphocytes are often called simply |
| A. | B cells |
| B. | T cells |
| C. | T Lymphocytes |
| D. | none of these |
| Answer» B. T cells | |
| 52. |
Which species lack immunoglobulin light chains? |
| A. | Camels |
| B. | Humans |
| C. | cows |
| D. | Buffalo |
| Answer» B. Humans | |
| 53. |
Which of the following are responsible for immune specificity? |
| A. | Antigens |
| B. | Antibodies |
| C. | T lymphocytes |
| D. | Macrophage |
| Answer» C. T lymphocytes | |
| 54. |
Lack of reaction to our own human leukocyte antigens (HLAs) is known as? |
| A. | autoimmunity |
| B. | complement system |
| C. | clonal selection |
| D. | tolerance |
| Answer» E. | |
| 55. |
The humoral immune response relies on the production of soluble proteins called |
| A. | antibodies |
| B. | macromolecules |
| C. | lymphocytes |
| D. | none of these |
| Answer» B. macromolecules | |
| 56. |
Which of the following is most likely to produce anaphylaxis in a susceptible individual? |
| A. | Pollen |
| B. | Mold |
| C. | Dust |
| D. | Bee sting |
| Answer» E. | |
| 57. |
A cell which defends against body cells in which viruses are reproducing is |
| A. | Exotoxin |
| B. | Cytotoxic T cell |
| C. | Endotoxin |
| D. | Suppressor T cell |
| Answer» C. Endotoxin | |
| 58. |
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» E. | |
| 59. |
Which of those immunoglobulin classes is mainly found in external secretions? |
| A. | Ig A |
| B. | Ig D |
| C. | Ig M |
| D. | IgE |
| Answer» B. Ig D | |
| 60. |
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» B. three Fab fragments and two Fc fragments | |
| 61. |
Antibodies can be used |
| A. | for the localization of proteins in the cell |
| B. | for protein purification |
| C. | to catalyze chemical reactions |
| D. | all of the above |
| Answer» E. | |
| 62. |
The protein, produced by B cells that binds to a specific antigen is |
| A. | phagocyte |
| B. | leukocyte |
| C. | vaccine |
| D. | antibody |
| Answer» E. | |
| 63. |
Which of the following characteristics are common in lymphocytes, macrophages, and neutrophils? |
| A. | They are all part of the nonspecific immune response in vertebrates |
| B. | They are all part of the specific immune response in vertebrates |
| C. | They are all part of the internal defenses of nonvertebrates |
| D. | They are all types of white blood cells |
| Answer» E. | |
| 64. |
Which of these is part of the lymphoid system in humans? |
| A. | Liver |
| B. | Stomach |
| C. | Tonsils |
| D. | Kidneys |
| Answer» D. Kidneys | |
| 65. |
Antigenic determinants bind to which portions of an antibody? |
| A. | Variable regions |
| B. | Constant regions |
| C. | Only light chains |
| D. | Only heavy chains |
| Answer» B. Constant regions | |
| 66. |
Structures of anti-PCP antibody shows that the tight binding of PCP to the antibody is primarily due to |
| A. | hydrophobic forces |
| B. | electrostatic forces. |
| C. | Van der Waals forces. |
| D. | none of these |
| Answer» B. electrostatic forces. | |
| 67. |
What type of B cell is like a tiny factory that produces antibodies identical to the B cell receptor that bind to the original antigen? |
| A. | T cells |
| B. | Memory cells |
| C. | Plasma cells |
| D. | Macrophages |
| Answer» D. Macrophages | |
| 68. |
Which of the following white blood cells act as scavengers when they engulf and digest pathogens? |
| A. | Macrophages |
| B. | T cells |
| C. | B cells |
| D. | Lymphocytes |
| Answer» B. T cells | |
| 69. |
Which of the following components of the vertebrate immune response occurs first upon invasion by a virus or bacterium? |
| A. | Activation of killer T lymphocytes |
| B. | Activation of B lymphocytes |
| C. | The inflammatory response |
| D. | Mobilization of complement proteins |
| Answer» D. Mobilization of complement proteins | |
| 70. |
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» E. | |
| 71. |
Monoclonal refers to |
| A. | a single clone of antibody-producing cells |
| B. | all the antibody molecules which are identical |
| C. | the binding with same antigenic site with identical binding affinities |
| D. | all of the above |
| Answer» E. | |
| 72. |
If Class IIMHC is not expressed in the thymus, the resulting immune deficiencies would include all of the following except reduced |
| A. | alternative complement activation. |
| B. | CD8 T cell-mediated cytotoxicity |
| C. | macrophage activation to vesicular pathogens |
| D. | IgG synthesis |
| Answer» B. CD8 T cell-mediated cytotoxicity | |
| 73. |
Fab fragment has |
| A. | one antigen binding site |
| B. | two antigen binding site |
| C. | one antibody binding site |
| D. | two antibody binding site |
| Answer» B. two antigen binding site | |
| 74. |
Immunological memory is due to |
| A. | short lived macrophage that can recognize specific pathogens |
| B. | long lived B cells that secrete a specific antibody |
| C. | long lived B cells that secrete a specific antigen |
| D. | short lived helper T cells that signal macrophage to divide |
| Answer» C. long lived B cells that secrete a specific antigen | |
| 75. |
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» B. complement killings of the cells and phagocytosis | |
| 76. |
Which of the Rous sarcoma virus has a homologous cellular protein? |
| A. | c-src |
| B. | v-src |
| C. | v-ha-src |
| D. | v-ha-ras |
| Answer» B. v-src | |
| 77. |
A monoclonal antibody (mAb) specific for the 2,4-dinitrophenyl (DNP) hapten might also bind |
| A. | Leu or Ileu |
| B. | His or Pro |
| C. | Tyr or Phe |
| D. | Ser or Thr |
| Answer» D. Ser or Thr | |
| 78. |
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» C. both (a) and (b) | |
| 79. |
What is a protein produced by host cells infected by viruses? |
| A. | Interferon |
| B. | Histamine |
| C. | Antiserum |
| D. | Vaccine |
| Answer» B. Histamine | |
| 80. |
Type A blood |
| A. | can be used to donate to type AB individuals |
| B. | can be used to donate to type B individuals |
| C. | contains type B antigens on the surface of red blood cells |
| D. | can always be used to donate to an Rh+ individual |
| Answer» B. can be used to donate to type B individuals | |
| 81. |
Which of the following blood proteins can destroy pathogens? |
| A. | Major histocompatibility complex |
| B. | Platelets |
| C. | Fibrinogen |
| D. | Complement system |
| Answer» E. | |
| 82. |
What is the behavior in which T cells and B cells constantly travel throughout the body seeking out and destroying foreign substances? |
| A. | Antibody-mediated immune response |
| B. | Immune surveillance |
| C. | Cell-mediated immune response |
| D. | Vaccination |
| Answer» C. Cell-mediated immune response | |
| 83. |
What is the result of invasion of a body by pathogens? |
| A. | Infection |
| B. | Inflammation |
| C. | Swelling |
| D. | Pus |
| Answer» B. Inflammation | |
| 84. |
Which of the following produces the antibodies employed in the specific immune response of vertebrates? |
| A. | B lymphocytes |
| B. | T lymphocytes |
| C. | Neutrophils |
| D. | Macrophages |
| Answer» B. T lymphocytes | |
| 85. |
In a fetus, where are lymphocytes produced? |
| A. | In the spleen |
| B. | In the bone marrow |
| C. | In the liver |
| D. | In the heart |
| Answer» D. In the heart | |
| 86. |
Which of the following is not part of the vertebrate immune system? |
| A. | Lymphocytes |
| B. | Antibodies |
| C. | Cardiac glycosides |
| D. | Lymph nodes |
| Answer» D. Lymph nodes | |
| 87. |
In animals, blood clots serve the function of |
| A. | consuming invading organisms |
| B. | helping them match the background coloration of the habitat |
| C. | stimulating production of killer T lymphocytes |
| D. | repairing damage to the body wall |
| Answer» E. | |
| 88. |
Which of these is a type of specific defense against pathogens? |
| A. | Lymphocytes |
| B. | Macrophages |
| C. | Phagocytes |
| D. | Leukocytes |
| Answer» B. Macrophages | |
| 89. |
The maturation of T cells and the production of particular T cell receptors occurs in the |
| A. | thyroid gland |
| B. | thymus gland |
| C. | testes |
| D. | all of these |
| Answer» C. testes | |
| 90. |
What type of B cell remains dormant in the body, but can respond rapidly if the same antigen appears again? |
| A. | T cells |
| B. | Memory cells |
| C. | Plasma cells |
| D. | Macrophages |
| Answer» C. Plasma cells | |
| 91. |
Which of the following provide specific defense against viruses and bacteria? |
| A. | T cells |
| B. | B cells |
| C. | Complement |
| D. | inflammation |
| Answer» C. Complement | |