#Question id: 32370
#Unit 2. Cellular Organization
#Question id: 28050
#Unit 1. Molecules and their Interaction Relevant to Biology
Which of the following does not lead to exposure of hydrophobic amino acids on the surface of a protein?
#Question id: 24445
#Unit 13. Methods in Biology
#Question id: 27402
#Unit 1. Molecules and their Interaction Relevant to Biology
In which of the following lipid two phosphatidic acids share a single glycerol (R1 and R2 are fatty acyl groups).
#Question id: 7764
#Unit 5. Developmental Biology
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.