Cellular senescence may have evolved to protect organisms against cancer. Instead of dividing out of control, the cells die. Cellular senescence appears to be regulated by several tumor suppressor genes, especially p53.what is the most appropriate reason behind this,

1) Transcription factor p53 is thought to suppress tumorigenesis by causing cell arrest and senescence in response to short telomeres, DNA damage, and viral or external signals to divide

2) This factor can stop the cell cycle, cause cellular senescence in rapidly dividing cells, instruct genes to initiate cellular apoptosis, and activate DNA repair enzymes.

3) Induction of apoptosis or cellular senescence by p53 always beneficial.

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#Question id: 11655

#10. Ecological Principles

succession as proceeding to a distinct end point, each phase of succession shown in given diagram (A → D)

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#Question id: 11196

#7. System Physiology – Animal

Pyrethroid insecticides prevent the voltage-gated sodium channels of insects from inactivating. Neurons that were exposed to pyrethroids would ________.

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#Question id: 9188

#9. Diversity of Life Forms

Which of the following are examples or parts of plantsʹ systemic acquired resistance against infection?

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#Question id: 2294

#2. Cellular Organization

________ use such high magnification that even atoms are discernable.

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#Question id: 23946

#Aptitude

Which of the following is not related to Indian Education Commission's (1964-66) recommendations?