MCQ

UNITY OF LIFE

Q1) Chemically, protoplasm contains:

A) 60-70% of H2O

B) 30-40% of H2O

C) 90-95% of H2O

D) 70-90% of H2O

E) 50-60% of H2O

Q2) If water is evaporated, the remaining dry weight of the cell consists of:

A) Carbon

B) Hydrogen

C) Nitrogen

D) Oxygen

E) Ammonia

Q3) During photosynthesis, which one is used as a reducing agent:

A) Carbon

B) Oxygen

C) Hydrogen

D) Nitrogen

E) Ammonia

Q4) Regarding the chemical composition of cells, which combination is correct?

A) Water…. 95%

B) Lipids…. 10%

C) Protein…. 18%

D) Carbohydrates…. 20%

E) DNA…. 1%

Q5) Regarding nucleic acid composition (in%) of the cell:

A) RNA is more than DNA

B) DNA is more than RNA

C) DNA and RNA are in the same ratio

D) The amount of DNA & RNA varies from individual to individual

E) In bacterial cell, DNA is more whereas in mammalian cells RNA is relatively greater in amount

Q6) Percentage of elements by weight in the human body (in descending order):

A) Nitrogen → Oxygen → Hydrogen → Carbon

B) Oxygen → Hydrogen → Nitrogen → Carbon

C) Carbon → Nitrogen → Oxygen → Hydrogen

D) Carbon → Oxygen → Hydrogen → Nitrogen

E) Carbon → Hydrogen → Oxygen → Nitrogen

Q7) Regarding the water molecule:

A) It acts as an acid  

B) It acts as a base

C) It acts as both an acid and a base

D) It acts as neither acid nor base

E) None of them is correct

Q8) Regarding buffer:

A) It helps to increase pH of a solution

B)It helps to prevent changes in pH

C) It helps to decrease pH of a solution

D) Water cannot act as a buffer, as it is amphoteric  

E) A & C are correct

Q9) Huge and highly organized molecules that form the structure & carry out activities are called:

A) Monomers

B) Micromers

C) Macromolecules

D) Micro molecules

E) Dimers

Q10) The joining of two monomers is called:

A) Hydrolysis

B) Hybridization

C) Condensation

D) Dehydration

E) Polymerization

Q11) A process during which polymers are broken down into monomers by the addition of H2O is called:

A) Hydrolysis

B) Hydration

C) Condensation

D) Dehydration

E) Polymerization

Q12) Which element constitute the highest percentage by weight in the human body?

A) Oxygen

B) Carbon

C) Nitrogen

D) Hydrogen

E) Phosphorus

Q13) which element is important for protein synthesis, nucleic acids, hormones, co-enzymes?

A) Carbon

B) Oxygen

C) Hydrogen

D) Nitrogen

E) Phosphorus

Q14) Biological molecules can be divided into main classes:

A) Two

B) Three

C) Four

D) Five

E) Six

Q15) Protein constitute ________ % of dry weight of cell.

A) More than 40

B) Less than 40

C) More than 50

D) Less than 50

E) None of the above

Q16) Proteins are the complex organic compounds having:

A) Only C, H, O

B) Only C, H, O & N

C) Carbon & hydrogen only

D) C, H, O, N, S

E) C, H, O but not phosphorus and sulphur

Q17) Dutch chemist G.J Murlder recognized the importance of protein as vital compound in:

A) 1993

B) 1793

C) 1883

D) 1893

E) None of the above

Q18) Amino acids are:

A) Organic compounds

B) Inorganic compounds

C) Macromolecules

D) Polymers

E) Tetramers

Q19) In polypeptide chain, amino acids are linked together by the process of:

A) Hydrolysis

B) hydration

C) Condensation

D) Dehydration

E) Polymerization

Q20) There are _____ basic structural level of protein:

A) Two

B) Three

C) Four

D) Five

E) Six

Answers:

  1. 70-90 % of H2O
  2. Carbon
  3. Hydrogen
  4. Protein…. 18%
  5. RNA is more than DNA
  6. Carbon → Hydrogen → Oxygen → Nitrogen
  7. It acts as both an acid and a base
  8. It helps to prevent changes in pH
  9. Macromolecules
  10. Condensation
  11. Hydrolysis
  12. Carbon
  13. Nitrogen
  14. Four
  15. More than 50
  16. C, H, O, N, S
  17. 1883
  18. Organic compounds
  19. Condensation
  20. Four



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