MCQOPTIONS
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MCQOPTIONS
This section includes 134 Mcqs, each offering curated multiple-choice questions to sharpen your Life Sciences knowledge and support exam preparation. Choose a topic below to get started.
| 1. |
What is reduction potential? |
| A. | The molecule loses an electron |
| B. | An atom/molecule gains an electron |
| C. | Reducing the power of an electron |
| D. | Oxidation power of an electron |
| Answer» C. Reducing the power of an electron | |
| 2. |
What is the name of the molecule which donates its electrons? |
| A. | Reducing agent |
| B. | Oxidative agent |
| C. | Standard reduction potential |
| D. | Oxidant |
| Answer» B. Oxidative agent | |
| 3. |
Which of the following equation gives the relationship between ∆G֯ and Keq? |
| A. | ∆G֯ = -RT ln Keq |
| B. | ∆G֯ = ln Keq |
| C. | ∆G = ∆G֯ (-RT Keq) |
| D. | ∆G = -RT ln Keq |
| Answer» B. ∆G֯ = ln Keq | |
| 4. |
Which of the following factor is not responsible for the actual change in free energy (∆G)? |
| A. | Temperature |
| B. | Pressure |
| C. | The initial concentration of reactant and products |
| D. | pH |
| Answer» E. | |
| 5. |
What is the value of ∆G, when a system is in equilibrium? |
| A. | ∆G = 0 |
| B. | ∆G = 1 |
| C. | ∆G = -1 |
| D. | ∆G = ∆G֯ |
| Answer» B. ∆G = 1 | |
| 6. |
Which of the following equation shows the relationship between free energy change (∆G) and the change in entropy (∆S), under constant temperature and pressure? |
| A. | ∆G = T∆H – ∆S |
| B. | ∆G = T∆H/∆S |
| C. | ∆G = ∆H/T∆S |
| D. | ∆G = ∆H – T∆S |
| Answer» E. | |
| 7. |
Gibb’s free energy is the portion of the total energy which is available for useful work. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 8. |
What is the process of synthesis of glucose by the liver is referred to as? |
| A. | gluconeogenesis |
| B. | neogenesis |
| C. | glycolysis |
| D. | saccharification |
| Answer» B. neogenesis | |
| 9. |
Feedback inhibition is cell’s mechanism to _____________ the process of anabolism. |
| A. | activate |
| B. | inhibit |
| C. | increase |
| D. | decrease |
| Answer» C. increase | |
| 10. |
Allosteric site is same as enzyme’s active site. |
| A. | True |
| B. | False |
| Answer» C. | |
| 11. |
Induced fit in an enzyme refers to ____________________ |
| A. | error |
| B. | loop |
| C. | conformational change |
| D. | torsional change |
| Answer» D. torsional change | |
| 12. |
Chymotrypsin is a ___________ |
| A. | starch |
| B. | polymer |
| C. | buffer |
| D. | enzyme |
| Answer» E. | |
| 13. |
What will happen if heat is applied to an enzyme mediated reaction? |
| A. | Rate will increase |
| B. | pH will increase |
| C. | pH will decrease |
| D. | Denaturation of enzyme |
| Answer» B. pH will increase | |
| 14. |
Enzymes have no effect on which of the following, in a chemical reaction? |
| A. | activation energy |
| B. | speed |
| C. | thermodynamics |
| D. | completion time |
| Answer» D. completion time | |
| 15. |
The non-protein constituents of conjugated proteins are called ___________ |
| A. | enzymes |
| B. | cofactors |
| C. | amino acids |
| D. | nucleosides |
| Answer» C. amino acids | |
| 16. |
Protein catalysts are called __________ and RNA catalysts are called _____________ |
| A. | enzymes, ribozymes |
| B. | ribozymes, enzymes |
| C. | enzymes, ribosomes |
| D. | ribosomes, enzymes |
| Answer» B. ribozymes, enzymes | |
| 17. |
Which of the following are responsible virtually for every reaction that takes place inside a cell? |
| A. | Carbohydrates |
| B. | ADP |
| C. | Nucleic acids |
| D. | Enzymes |
| Answer» B. ADP | |
| 18. |
Cellular metabolism is a non-equilibrium metabolism. |
| A. | True |
| B. | False |
| Answer» B. False | |
| 19. |
Hydrolysis of ATP is which type of reaction? |
| A. | Physical |
| B. | Mechanical |
| C. | Endergonic |
| D. | Exergonic |
| Answer» E. | |
| 20. |
Exergonic processes are thermodynamically unfavorable. |
| A. | True |
| B. | False |
| Answer» C. | |
| 21. |
According to laws of thermodynamics, the energy of the Universe is _________ whereas the entropy ______________ |
| A. | constant, increases |
| B. | constant, decreases |
| C. | increases, remains constant |
| D. | decreases, remains constant |
| Answer» B. constant, decreases | |
| 22. |
Reactions that lose heat are termed as _____________ |
| A. | endothermic |
| B. | exothermic |
| C. | chemical |
| D. | physical |
| Answer» C. chemical | |
| 23. |
Inorganic gases released during decomposition includes |
| A. | carbon dioxide |
| B. | hydrogen sulphide |
| C. | water vapors |
| D. | all of above |
| Answer» E. | |
| 24. |
Alternative path adopted by photo excited electrons is |
| A. | cyclic electron flow |
| B. | non-cyclic electron flow |
| C. | cyclic neutron flow |
| D. | non-cyclic proton flow |
| Answer» B. non-cyclic electron flow | |
| 25. |
Oxygen which is released during process of photosynthesis comes from |
| A. | hydrogen |
| B. | leaves |
| C. | water |
| D. | oxygen |
| Answer» D. oxygen | |
| 26. |
Tail attached to pyrrole ring is called |
| A. | porpyrin |
| B. | tail |
| C. | phytol |
| D. | nostale |
| Answer» D. nostale | |
| 27. |
Light is form of energy called |
| A. | electromagnetic energy |
| B. | radiations |
| C. | longitudinal-wave patterned energy |
| D. | Both a and b |
| Answer» E. | |
| 28. |
Yellowing of plants is due to absence of |
| A. | calcium |
| B. | chlorophyll |
| C. | magnesium |
| D. | nitrogen |
| Answer» D. nitrogen | |
| 29. |
Inorganic salts released during decomposition include |
| A. | nitrate |
| B. | sulfate |
| C. | phosphate |
| D. | all of above |
| Answer» E. | |
| 30. |
Splitting of water molecule releasing oxygen is called |
| A. | photosynthesis |
| B. | photolysis |
| C. | photolytic |
| D. | photophosphorylation |
| Answer» C. photolytic | |
| 31. |
Second pay off phase of cellular respiration is called |
| A. | preparatory phase |
| B. | net phase |
| C. | respiratory phase |
| D. | oxidative phase |
| Answer» E. | |
| 32. |
Type of respiration which humans adopt in severe physical activities is |
| A. | aerobic |
| B. | anaerobic |
| C. | fermentation |
| D. | accumulation |
| Answer» C. fermentation | |
| 33. |
Most abundant and most important photosynthetic pigment is |
| A. | chlorophyll-a |
| B. | chlorophyll-b |
| C. | chlorophyll-c |
| D. | chlorophyll-d |
| Answer» B. chlorophyll-b | |
| 34. |
Fungi paly a role as decomposers through enzyme |
| A. | protease |
| B. | lactase |
| C. | ADH |
| D. | insulin |
| Answer» B. lactase | |
| 35. |
Link between composers and decomposers is called as |
| A. | nitrogen cycle |
| B. | water cycle |
| C. | carbon cycle |
| D. | fertility restoration process |
| Answer» D. fertility restoration process | |
| 36. |
Exchange of gases between organism and environment is termed as |
| A. | internal respiration |
| B. | external respiration |
| C. | respiration |
| D. | acquired respiration |
| Answer» C. respiration | |
| 37. |
Phases of Calvin cycle involves |
| A. | carbon fixation |
| B. | reduction |
| C. | regeneration |
| D. | All of the Above |
| Answer» E. | |
| 38. |
Synthesis of ATP by initiation of reaction with light is called |
| A. | photophosphorylation |
| B. | photolysis |
| C. | photo system |
| D. | photosynthesis |
| Answer» B. photolysis | |
| 39. |
End product of glycolsis is |
| A. | glucose |
| B. | pyruvic acid |
| C. | citric acid |
| D. | glycogen |
| Answer» C. citric acid | |
| 40. |
Reactions which are light-independent are termed as |
| A. | light reactions |
| B. | dark reactions |
| C. | gaseous reactions |
| D. | dull reactions |
| Answer» C. gaseous reactions | |
| 41. |
Dense fluid filled region which helps in producing carbohydrate molecules is called |
| A. | lumen |
| B. | carpel |
| C. | stroma |
| D. | grana |
| Answer» D. grana | |
| 42. |
Special complex which is build in thylakoid membrane which helps in moving down gradient is called |
| A. | ATP complex |
| B. | ATP synthetase |
| C. | ATP synthase |
| D. | ANP complex |
| Answer» D. ANP complex | |
| 43. |
Oxidizing agent which removes hydrogen from fumarate is called |
| A. | FAD |
| B. | NAD |
| C. | NADP |
| D. | NADPH |
| Answer» B. NAD | |
| 44. |
T.W.Engleman, in 1833, obtained first action spectrum while working on |
| A. | bacteria |
| B. | virus |
| C. | spirogyra |
| D. | fungi |
| Answer» D. fungi | |
| 45. |
Smallest particles of light are called |
| A. | dust |
| B. | protons |
| C. | photons |
| D. | positrons |
| Answer» D. positrons | |
| 46. |
Wave-length of a visible light ranges between |
| A. | 360-678 |
| B. | 380-750 |
| C. | 280-670 |
| D. | 380-700` |
| Answer» C. 280-670 | |
| 47. |
Molecule of chlorophyll is composed of |
| A. | hydrophyllic head |
| B. | tail |
| C. | Both a and b |
| D. | hydrophillc joint |
| Answer» D. hydrophillc joint | |
| 48. |
Biogas includes none ,but |
| A. | carbon monoxide |
| B. | carboxyl acids |
| C. | methane |
| D. | ethane |
| Answer» D. ethane | |
| 49. |
During dark reactions, photosynthesis takes place by help of certain enzymes through cycle called |
| A. | kerb's cycle |
| B. | life cycle |
| C. | calvin cycle |
| D. | nitrogen cycle |
| Answer» D. nitrogen cycle | |
| 50. |
There is a chemical link between anabolism and catabolism in form of |
| A. | ADP |
| B. | ATP |
| C. | ATT |
| D. | ASP |
| Answer» C. ATT | |