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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To qualify as a biodiversity hotspot, a region must meet following two strict criteria

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When a cell is in equilibrium with its environment, which of the following processes occurs for substances that can diffuse through the plasma membrane?

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Which one of the following proteins is involved in promoter recognition in eukaryotes?

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Binding to the phosphorylated RTK through one of the RTK’s cytoplasmic domains, the adaptor protein also activates Ras. The activated receptor stimulates the adaptor protein to activate the: