6. Which of these things will affect the way a foetus grows? Choose the option you think is right.( )
A) Chemicals in cigarette smoke B) Alcohol C) Drugs D) All of the above
7. Which of the following is the correct sequence of steps in the human life cycle? Choose the right
option. ( )
A) Babyhood, childhood, adolescence, adulthood
B) Childhood, babyhood, adulthood, adolescence,
C) Adolescence, babyhood, adulthood, childhood D) None of these

Dr. Potu Narasimha Rao, a renowned scholar and an eminent cytologist came from a poor family in Muppalla village of Guntur district. He completed his graduation in Agriculture and did his MS at IARI, New Delhi. Later, he went to USA for research. He worked on the cytogenetics of tobacco plant. During his research, a cell line called Hela, isolated from a human tumour was established in 1952 and received his PhD in 1963. He switched his attention from plant cytogenetic to the field of cancer cells. He conducted research in cell kinematics and studied extensively on the 'triggering factor' of cell division i.e mitosi

He found that human cells either normal or cancer cells in culture media usually divide every 20 to 24 hours. But actually normal mitosis is completed in 40 to 60 minutes. The period in between two cell divisions is called interphase. The interphase further consists of 3 phases G1, S and G2 phases. To understand the functional relationship between these phases of cell cycle. Dr.N.Rao and his research associate Dr.Johnson conducted experiments on cell fusion technique. His researches revealed that the cell cycle is sequential

Unidirectional and controlled by a series of chemical signals. His experiments are considered to be a milestone in the cell cycle studies.This study threw a new hope of ray for the budding scientists to carry out researches on cell division. If you want to talk to this great scientist log in with email poturao@yahoo.com

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