141. The replication of DNA is a pre-requisite for a eukaryotic cell to undergo division. During the cell cycle, the DNA replicates in

1. 1. S-phase

   
   
   

   2. G₁ phase

   
   
   

   3. G₂ phase

   
   
   

   4. M-phase

   
   
   

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   S-phase

   Correct Option: A

   S-phase

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142. During which stage of mitosis does cytokinesis usually occur in animals ?

1. 1. Prophase

   
   
   

   2. Metaphase

   
   
   

   3. Anaphase

   
   
   

   4. Telophase

   
   
   

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   Telophase

   Correct Option: D

   Telophase

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143. Which of the following substances if introduce in the blood stream would cause coagulation at the site of its introduction ?

1. 1. Fibrinogen

   
   
   

   2. Prothrombin

   
   
   

   3. Heparin

   
   
   

   4. Thromboplastin

   
   
   

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1. View Hint View Answer Discuss in Forum

   Thromboplastin is a plasma protein aiding blood coagulatin through conversion of prothrombin to thrombin.

   Correct Option: D

   Thromboplastin is a plasma protein aiding blood coagulation through conversion of prothrombin to thrombin.

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144. Lysosome arises from

1. 1. endoplasmic reticulum

   
   
   

   2. golgi apparatus

   
   
   

   3. nucleus

   
   
   

   4. mitochondria

   
   
   

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   Lysosomal membrane is formed in ER, later it is modified and transferred to the cis face of Golgi apparatus where further processing release lysosome.

   Correct Option: B

   Lysosomal membrane is formed in ER, later it is modified and transferred to the cis face of Golgi apparatus where further processing release lysosome.

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145. pH of human blood is

1. 1. 7.4

   
   
   

   2. 6.2

   
   
   

   3. 9.0

   
   
   

   4. 7.5 - 8.0

   
   
   

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1. View Hint View Answer Discuss in Forum

   7.4

   Correct Option: A

   7.4

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