MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 89 Mcqs, each offering curated multiple-choice questions to sharpen your Cell Biology knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Epinephrine causes an increase in ____________________ |
| A. | blood glucose levels |
| B. | surface receptors |
| C. | rhodopsin pigments |
| D. | mast cells |
| Answer» B. surface receptors | |
| 52. |
The Protein-tyrosine kinases phosphorylate the ______________ residues. |
| A. | adenine |
| B. | cytosine |
| C. | tyrosine |
| D. | chymosin |
| Answer» D. chymosin | |
| 53. |
The Cholera toxin produced by Vibrio cholera exerts its effect by _____________________ |
| A. | modifying G-protein |
| B. | modifying primary messengers |
| C. | modifying effectors |
| D. | modifying receptors |
| Answer» B. modifying primary messengers | |
| 54. |
The Kaposi’s sarcoma is caused by ____________________ |
| A. | Herpes virus |
| B. | Adeno virus |
| C. | Human immunodeficiency virus |
| D. | Retro virus |
| Answer» B. Adeno virus | |
| 55. |
A somatic mutation is present in all of the individual’s body cells. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» C. May be True or False | |
| 56. |
The cytoplasmic protein-tyrosine kinases are activated indirectly by the extracellular signals. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 57. |
How many types of protein-tyrosine kinases are there? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» C. 3 | |
| 58. |
When the levels of glucose drop, alpha-cells in the pancreas secrete ____________________ |
| A. | glucose |
| B. | glucagon |
| C. | starch |
| D. | pancreatic fluid |
| Answer» C. starch | |
| 59. |
Bringing 2 kinase domains in close contact allows for ___________________ |
| A. | trans-autophosphorylation |
| B. | cis-autophosphorylation |
| C. | inactivation of one domain |
| D. | inactivation of both domains |
| Answer» B. cis-autophosphorylation | |
| 60. |
Which cells release insulin when glucose levels elevate in the body? |
| A. | zeta cells |
| B. | alpha cells |
| C. | gamma cells |
| D. | beta cells |
| Answer» E. | |
| 61. |
Ribosomes transcribe mRNA into |
| A. | carbohydrate |
| B. | protein |
| C. | fat |
| D. | lipid |
| Answer» C. fat | |
| 62. |
Regulators in animals that stimulate cells to grow and divide are called |
| A. | growth factors |
| B. | dividing factors |
| C. | growth inducers |
| D. | growth enzymes |
| Answer» B. dividing factors | |
| 63. |
Which of following molecules help in long-distance signaling in plants and animals? |
| A. | hormones |
| B. | glycoproteins |
| C. | enzymes |
| D. | steroids |
| Answer» B. glycoproteins | |
| 64. |
What is aggregation of bacteria called that is adhered to surface? |
| A. | bacterial surface |
| B. | plaque |
| C. | biofilm |
| D. | bio surface |
| Answer» D. bio surface | |
| 65. |
Which of following is coded by genes in DNA? |
| A. | mRNA |
| B. | rRNA |
| C. | miRNA |
| D. | tRNA |
| Answer» B. rRNA | |
| 66. |
Which of following hormone regulates sugar levels in humans? |
| A. | estrogen |
| B. | ethylene |
| C. | progesterone |
| D. | insulin |
| Answer» E. | |
| 67. |
Which of following hormones is a gas? |
| A. | ethylene |
| B. | estrogen |
| C. | progesterone |
| D. | steroids |
| Answer» B. estrogen | |
| 68. |
The a, b, and c respectively in the following image are _________________________ |
| A. | autocrine, paracrine, endocrine |
| B. | autocrine, endocrine, paracrine |
| C. | endocrine, paracrine, autocrine |
| D. | endocrine, autocrine, paracrine |
| Answer» B. autocrine, endocrine, paracrine | |
| 69. |
How many types of cell signaling are there? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» D. 4 | |
| 70. |
In which type of signaling, the cell that expresses messenger molecules also produces receptors? |
| A. | autocrine |
| B. | heterocrine |
| C. | paracrine |
| D. | endocrine |
| Answer» B. heterocrine | |
| 71. |
The last proteins to involve in the apoptotic pathway induced by TNF are ______________________ |
| A. | caspase-2 |
| B. | procaspase-2 |
| C. | caspase-8 |
| D. | procaspase-8 |
| Answer» E. | |
| 72. |
Which of the following is involved in the intrinsic pathway of apoptosis? |
| A. | cytochrome a |
| B. | cytochrome b |
| C. | cytochrome c |
| D. | cytochrome d |
| Answer» D. cytochrome d | |
| 73. |
Which family of proteins regulates the intrinsic pathway of apoptosis? |
| A. | Bcl-2 |
| B. | Bcl-4 |
| C. | Caspase-2 |
| D. | Caspase-8 |
| Answer» B. Bcl-4 | |
| 74. |
Apoptotic bodies can be recognized by the presence of _____________________ on the surface. |
| A. | phosphatidylserine |
| B. | phosphatidylcholine |
| C. | phosphatidylinositol |
| D. | phosphatidyltyrosine |
| Answer» B. phosphatidylcholine | |
| 75. |
Protein kinases and phosphatases act by altering ______________ of the signaling proteins. |
| A. | basicity |
| B. | conformation |
| C. | acidity |
| D. | size |
| Answer» C. acidity | |
| 76. |
Paracrine messenger molecules are usually ________________ |
| A. | large |
| B. | stable |
| C. | unstable |
| D. | amphoteric |
| Answer» D. amphoteric | |
| 77. |
Cell signaling is a process by which cells communicate. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 78. |
The primary messenger molecules bind to the transmembrane receptors. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 79. |
Endocrine messengers are also called ___________________ |
| A. | hormones |
| B. | receptors |
| C. | antibody |
| D. | antigen |
| Answer» B. receptors | |
| 80. |
The Etr1 gene in plants encodes for ___________________ |
| A. | ethylene gas |
| B. | ethylene gas receptor |
| C. | hydrogen sulfide |
| D. | hydrogen sulfide receptor |
| Answer» C. hydrogen sulfide | |
| 81. |
How many subunits does the Ras protein contain? |
| A. | 1 |
| B. | 2 |
| C. | 3 |
| D. | 4 |
| Answer» B. 2 | |
| 82. |
Which of the following synthesis is decreased (or stopped) when the blood glucose levels are high? |
| A. | gluconeogenesis |
| B. | triglyceride |
| C. | glycogen |
| D. | glucagon |
| Answer» B. triglyceride | |
| 83. |
Diabetes Mellitus is caused by defects in insulin signaling. |
| A. | True |
| B. | False |
| C. | May be True or False |
| D. | Can't say |
| Answer» B. False | |
| 84. |
Diabetes Mellitus type II is caused due __________________________ |
| A. | inability to produce insulin |
| B. | insulin resistance |
| C. | low glucose levels |
| D. | low lactose levels |
| Answer» C. low glucose levels | |
| 85. |
Which of following is an example of neurodegenerative disease? |
| A. | diabetes |
| B. | parkinson's disease |
| C. | lymphoma |
| D. | cancer |
| Answer» C. lymphoma | |
| 86. |
How many caspases are involved in apoptosis of human cells? |
| A. | 12 |
| B. | 13 |
| C. | 14 |
| D. | 15 |
| Answer» E. | |
| 87. |
What is term used for a molecule that binds specifically to another larger molecule? |
| A. | substrate |
| B. | protein |
| C. | ligand |
| D. | enzyme |
| Answer» D. enzyme | |
| 88. |
Which of following disorder is associated with malfunction of Ced-4 protein? |
| A. | diabetes |
| B. | parkinson's disease |
| C. | down syndrome |
| D. | lymphoma |
| Answer» E. | |
| 89. |
What are main proteins of apoptosis called? |
| A. | caspases |
| B. | lipases |
| C. | phosphatases |
| D. | proteases |
| Answer» B. lipases | |