The active site of an enzyme_____.

1. 1. Determined by structure and the specificity of the enzyme
   2. Forms no chemical bond with substrate
   3. They are non specific in their action
   4. Never changes

In which group of tracheophytes ovules are born on the exposed surface of megasporophylls_____.

1. 1. Gymnosperms
   2. Filicineae
   3. Angiosperms
   4. Spheospsida

Which of the following bacteria are thick rigid and spiral_____.

1. 1. Coccus
   2. Vibrio
   3. Spirochete
   4. Spirillum

Who coined the term Animalcules for microorganisms like Bacteria and protozoa_____.

1. 1. Alexander Fleming
   2. Leeuwenhoek
   3. Robert Koch
   4. Louis Pasteur

Oxygen accounts for ____ % of totals human body mass?

1. 1. 0.16
   2. 0.4
   3. 0.65
   4. 0.70

Ribosomes + m-RNA?

1. 1. Polosome
   2. Phlosome
   3. Polysome
   4. None of these

_____ is concerned with cell secretions?

1. 1. Cell membrane
   2. Lysosomes
   3. Endoplasmic reticulum
   4. Golgi complex

In Urea cycle _____ammonia molecules combine with 1 CO2 molecule to form 1 molecule of urea.

1. 1. 2
   2. 3
   3. 4
   4. 5

Which of the following excretory structure is associated with gut of the organism?

1. 1. Malpighian tubules
   2. Nephrons
   3. Protonephridium
   4. Metanephridium

Accumulation of lipid molecules in brain cells lead to_____.

1. 1. Mental retardation
   2. Edema
   3. Paralysis
   4. All of these