MCQOPTIONS
Saved Bookmarks
MCQOPTIONS
This section includes 1275 Mcqs, each offering curated multiple-choice questions to sharpen your Biology Mcqs knowledge and support exam preparation. Choose a topic below to get started.
| 151. |
Amoeboid movements and movement of cyclosis is due to_________? |
| A. | Microfilaments |
| B. | Microtubules |
| C. | Intermediate filaments |
| D. | Cytoskeleton |
| Answer» B. Microtubules | |
| 152. |
Which step causes activation of catalytic site of an enzyme__________________? |
| A. | Change in pH of the surroundings |
| B. | Formation of Enzyme Susstrate complex |
| C. | Change in the charge of the active site |
| D. | Change in temperature |
| Answer» C. Change in the charge of the active site | |
| 153. |
A cofactor made of inorganic ion which is detachable is called__________________? |
| A. | Prosthetic group |
| B. | Coenzyme |
| C. | Activator |
| D. | Cofactor |
| Answer» D. Cofactor | |
| 154. |
Which one is an organic compound_____________? |
| A. | CO2 |
| B. | Water |
| C. | Lipids |
| D. | HCI |
| Answer» D. HCI | |
| 155. |
Which statement about enzyme is incorrect_________________? |
| A. | Some of them consist solely of protein with no non protein part |
| B. | They catalyze a chemical reaction without being utilized |
| C. | All enzymes are fibrous Proteins |
| D. | They without their cofactor are called apoenzyme. |
| Answer» D. They without their cofactor are called apoenzyme. | |
| 156. |
A three dimensional dcavity bearing a specific charge by which the enzyme reacts with its substrate is called_________________? |
| A. | Active site |
| B. | Binding site |
| C. | Catalytic site |
| D. | Allosteric site |
| Answer» B. Binding site | |
| 157. |
Whone is not the function of endoplasmic reticulum? |
| A. | Nerve impulse conduction |
| B. | Transport of material |
| C. | Mechanical support |
| D. | Synthesis of conjugated molecules |
| Answer» E. | |
| 158. |
If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________? |
| A. | Enzymes get denatured at higher substrate conc |
| B. | Rate of reaction is indirectly proportional to substrate concentration at this point |
| C. | All the active sites on enzyme molecule are occupied |
| D. | None of these |
| Answer» D. None of these | |
| 159. |
Cellular organelles related with H2O2 are___________? |
| A. | Glyoxisomes |
| B. | Lysosomes |
| C. | Peroxisomes |
| D. | Ribosomes |
| Answer» D. Ribosomes | |
| 160. |
Factory of Ribosomal systhesis is__________? |
| A. | Cytoplasm |
| B. | Nucleus |
| C. | Nucleolus |
| D. | Endoplasmic reticulum |
| Answer» D. Endoplasmic reticulum | |
| 161. |
The active site of an enzyme______________? |
| A. | Never changes |
| B. | Forms no chemical bond with substrate |
| C. | Determined by structure and the specificity of the enzyme |
| D. | They are non specific in their action |
| Answer» D. They are non specific in their action | |
| 162. |
If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________? |
| A. | increase in concentration of enzyme |
| B. | increase in concentration of substrate |
| C. | increase in pH |
| D. | increase in temperature |
| Answer» B. increase in concentration of substrate | |
| 163. |
If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________? |
| A. | Saturation |
| B. | Denaturation |
| C. | Composition |
| D. | Inhibition |
| Answer» B. Denaturation | |
| 164. |
Who opposed the idea the cell is an empty space bounded by thick wall? |
| A. | Lorenz Oken |
| B. | Schwann |
| C. | Robert Brown |
| D. | Rudolph Virchow |
| Answer» D. Rudolph Virchow | |
| 165. |
The structure of an enzyme is altered by____________? |
| A. | Irreversible inhibitor |
| B. | Reversible inhibitor |
| C. | Competitive inhibitor |
| D. | Non-competitive inhibitor |
| Answer» B. Reversible inhibitor | |
| 166. |
Malonic acid is an example of____________? |
| A. | Irreversible inhibitor |
| B. | Reversible inhibitor |
| C. | Competitive inhibitor |
| D. | Non-competitive inhibitor |
| Answer» D. Non-competitive inhibitor | |
| 167. |
Magnifying power of electron microscope as compared to eye is____________? |
| A. | 500 X |
| B. | 250000X |
| C. | 500000X |
| D. | 250X |
| Answer» C. 500000X | |
| 168. |
A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________? |
| A. | Irreversible inhibitor |
| B. | Reversible inhibitor |
| C. | Competitive inhibitor |
| D. | Non-competitive inhibitor |
| Answer» D. Non-competitive inhibitor | |
| 169. |
Inhibitors which block the enzyme by forming weak bond are called___________? |
| A. | Competitive inhibitors |
| B. | Non-competitive inhibitors |
| C. | Irreversible inhibitors |
| D. | Both a and b |
| Answer» E. | |
| 170. |
60S and 40S subunit combine to form ________ particle. |
| A. | 100 S |
| B. | 90 S |
| C. | 80 S |
| D. | 70 S |
| Answer» D. 70 S | |
| 171. |
Which of the statement about cell membrane is not true? |
| A. | It contains protein molecules embedded in lipid bilayer |
| B. | It is a differentially permeable membrane |
| C. | It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles. |
| D. | It may get infolded to engulf solid or liquid material. |
| Answer» D. It may get infolded to engulf solid or liquid material. | |
| 172. |
Specific heat of vaporization of water is_______________? |
| A. | 574 Kcal/kg |
| B. | 674 Kcal/kg |
| C. | 774 Kcal/kg |
| D. | 874 Kcal/kg |
| Answer» B. 674 Kcal/kg | |
| 173. |
Carbon atom is_____________? |
| A. | Monovalent |
| B. | Divalent |
| C. | Trivalent |
| D. | Tetravalent |
| Answer» E. | |
| 174. |
Maximum number of species of living things on earth are___________? |
| A. | Algae |
| B. | Fungi |
| C. | Insects |
| D. | Protozoa |
| Answer» D. Protozoa | |
| 175. |
Which of the following statement is incorrect about Glyoxisomes? |
| A. | They contain enzymes which help in conversion of fatty acids into carbohydrate |
| B. | They are abundant in soyabeans but absent in pea |
| C. | They are present through out life of a plant and provide them whth energy through Glyoxylate cycle |
| D. | They are signle membranous organelles |
| Answer» D. They are signle membranous organelles | |
| 176. |
The branch of biology which deals with the study of chemical compounds and the chemical processes in the fliving organisms is called_________________? |
| A. | Chemistry |
| B. | Biochemistry |
| C. | Molocular biology |
| D. | Both a and b |
| Answer» C. Molocular biology | |
| 177. |
Which chemical component has the same % in bacterial as well as the mammalian cell_____________? |
| A. | Water |
| B. | Carbohydrate |
| C. | Proteins |
| D. | Lipids |
| Answer» B. Carbohydrate | |
| 178. |
Primary structure of proteins determines__________? |
| A. | Number of polypeptide chains involved |
| B. | Bending of polypeptide chains |
| C. | Amino acid sequence |
| D. | Coiling of polypeptide chains |
| Answer» D. Coiling of polypeptide chains | |
| 179. |
Which chemical component has the greatest contribution in the total mammalian cell weight__________? |
| A. | Proteins |
| B. | Carbohydrate |
| C. | Lipids |
| D. | Water |
| Answer» E. | |
| 180. |
Variety among amino acids is produced due to_____________? |
| A. | NH2 group |
| B. | COOH group |
| C. | R group |
| D. | All of these |
| Answer» D. All of these | |
| 181. |
Which statement is true about an aqueous medium________________? |
| A. | Ionic as well as non ionic substance in aqueous media retains their identity |
| B. | Enzymes can not perform catalysis reaction in this medium |
| C. | Ions and molecules move randomly thus are in more favorable state to react with other molecules and ions |
| D. | It is less favorable media for chemical reactions |
| Answer» D. It is less favorable media for chemical reactions | |
| 182. |
Which of the statement is not true for compounds like glycoprotein and glycolipids____________? |
| A. | They are conjugated molecules of carbohydrates |
| B. | Both have role in the extra cellular matrix of animals and bacterial cell wall |
| C. | They are components of biological membranes. |
| D. | Both are produced and secreted by endoplasmic reticulum |
| Answer» E. | |
| 183. |
Which of the following carbohydrate is tasteless___________? |
| A. | Monosaccharide |
| B. | Oligosaccharide |
| C. | Polysaccharide |
| D. | None of these |
| Answer» D. None of these | |
| 184. |
A complex substance which on hydrolysis yields polyhydroxy aldehyde or ketone subunits is called__________? |
| A. | Lipid |
| B. | Carbohydrate |
| C. | Protein |
| D. | Carotein |
| Answer» C. Protein | |
| 185. |
Which one are most complex sugar_____________? |
| A. | Monosaccharides |
| B. | Oligosaccharides |
| C. | Polysaccharides |
| D. | None of these |
| Answer» D. None of these | |
| 186. |
The property of water due to which it works as a temperature stabilizer and hence protect living organisms from sudden thermal changes is_______________? |
| A. | High specific heat of vaporization |
| B. | High specific heat capacity |
| C. | Its Dipole nature |
| D. | Its liquid state |
| Answer» C. Its Dipole nature | |
| 187. |
During digesting the phagocytosed food particles vesicles formed from fusion of phagocytic vacuole with the enzymes secreted by Golgi apparantus are called_______? |
| A. | Lysosomes |
| B. | Primary lysosomes |
| C. | Secondary lysosomes |
| D. | Food vacuole |
| Answer» D. Food vacuole | |
| 188. |
Which one forms the raw material for coenzymes_______________________? |
| A. | Vitamins |
| B. | Carbohydrates |
| C. | Proteins |
| D. | Metals |
| Answer» B. Carbohydrates | |
| 189. |
If more substrate to already occurring enzymatic reaction is added more enzyme activity is seen because_____________? |
| A. | There is probably more substrate present than there is enzyme. |
| B. | There is probably more enzayme available than there is substrate. |
| C. | There is probably more product present than there is either substrate or enzyme. |
| D. | The enzyme substrate complex is probably failing to form during the reaction |
| Answer» C. There is probably more product present than there is either substrate or enzyme. | |
| 190. |
The number of calories required to raise the temperature of 1g of water from 15 to 16?C is called___________? |
| A. | Specific Heat of Vaporization |
| B. | Specific Heat capacity |
| C. | Caloric Heat |
| D. | Both A and C |
| Answer» C. Caloric Heat | |
| 191. |
The single healthy megaspore retained within the megasporangium germinates to form an egg containing female gaemtophyte called______________? |
| A. | Ovule |
| B. | Seed |
| C. | Fruit |
| D. | Embroyo sac |
| Answer» E. | |
| 192. |
The mechanism of stomatal movement is related to the branch of Biology called__________? |
| A. | Taxonomy |
| B. | Physiology |
| C. | Morphology |
| D. | Anatomy |
| Answer» C. Morphology | |
| 193. |
The one which is present in all living things is ___________? |
| A. | Cell nucleus |
| B. | DNA or RNA |
| C. | Cell membrane |
| D. | Vacuole |
| Answer» C. Cell membrane | |
| 194. |
Which of the following impart a red colour to Rose petals? |
| A. | Chloroplast |
| B. | Chlorophyll |
| C. | Chromoplast |
| D. | Leucoplast |
| Answer» D. Leucoplast | |
| 195. |
Which of the following substance is most favorable to form structural component of biological membranes___________? |
| A. | Hydrophilic Carbohydrates |
| B. | Hydrophobic fats |
| C. | Both a and b |
| D. | None of these |
| Answer» C. Both a and b | |
| 196. |
Which one is the basic element of organic compounds _________________? |
| A. | Oxygen |
| B. | Hydrogen |
| C. | Sulphur |
| D. | Carbon |
| Answer» E. | |
| 197. |
The bond formed when two or more atoms complete their electron shells by sharing electrons is called_____________? |
| A. | Ionic bond |
| B. | Hydrogen bond |
| C. | Covalent bond |
| D. | Electrovalent bond |
| Answer» D. Electrovalent bond | |
| 198. |
Reactions in which simple substances are combined to form complex substances are called_____________? |
| A. | Metabolic reactions |
| B. | Catabolic reactions |
| C. | Anabolic reactions |
| D. | None of these |
| Answer» D. None of these | |
| 199. |
A chemical substance which can react (in place of substrate) with the enzyme but is not transformed into product/s and thus blocks the active site temporarily or permanently is called_______________? |
| A. | Co-enzyme |
| B. | Blocker |
| C. | Inhibitor |
| D. | Cofactor |
| Answer» D. Cofactor | |
| 200. |
Optimal temperature of enzymes present in human body is_____________? |
| A. | 27?C |
| B. | 37?C |
| C. | 47?C |
| D. | 30?C |
| Answer» C. 47?C | |