#Question id: 4361
#SCPH28 | Zoology
How do steroid hormones produce their effects in cells?
#Question id: 7294
#SCPH01 Biochemistry
Multiple factors regulate flowering in Arabidopsis. FT mRNA is expressed in companion cells of the leaf vein in response to multiple signals, including day length, light quality, and temperature. FT moves in the phloem from leaves to the apical meristem. FT is unloaded from the phloem in the meristem and interacts with FD.
FT-FD complex activates multiple genes. Which of the following combination is correct?(SS)
#Question id: 4569
#I Life Science/ Life Sciences Group – I-V
Which of the following must exist in a population before natural selection can act upon that population?
#Question id: 1057
#SCPH28 | Zoology
Phage-encoded proteins are
#Question id: 7764
#SCPH01 Biochemistry
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.