#Question id: 11840
#Unit 6. System Physiology – Plant
During an ethylene signalling pathway, what will have done inside cytosol and nucleus . Given below some
prediction about presence and absence of ethylene in column B match with column
A
|
COLUMN A |
COLUMN B |
|
I- In the presence of ethylene |
a) ETR1 signaling is repressed and CTR1 is
inactive |
|
II-
In the absence of ethylene |
b) ETR1 activate CTR1, a Ser/Thr kinase |
|
|
c) CTR1 phosphorylates the C-terminal domain
of EIN2 |
|
|
d) The nonphosphorylated C terminus of EIN2 is
cleaved by a protease |
|
|
e) Phosphorylation of EIN2 inhibits
proteolytic cleavage |
|
|
f) EIN3 transcription factors are
ubiquitinated and degraded in the nucleus by the 26S proteasome |
|
|
g) EIN3 initiates a transcriptional cascade by
activating expression of ethylene-responsive genes, including ERF1
transcription factor, leading to ethylene responses |
#Question id: 9591
#Unit 6. System Physiology – Plant
In light reaction, the funneling of excitation from the antenna system toward the reaction centre has been shown,
a.) The excited-state energy of pigments increases with distance from the reaction centre; that is, pigments closer to the reaction centre are lower in energy than those farther from the reaction centre
b.) The energy gradient ensures that excitation transfer toward the reaction centre is energetically favorable and that excitation transfer back out to the peripheral portions of the antenna is energetically unfavourable
c.) Some energy is lost as heat to the environment by this process, but under optimal conditions almost all the excitation energy absorbed in the antenna complexes can be delivered to the reaction centre
d.) The excited-state energy of pigments decreases with distance from the reaction centre
Which of the following above combination is true?
#Question id: 2853
#Unit 2. Cellular Organization
Not all bacteria need to maintain their DNA in a negatively supercoiled state. Bacteria that prefer to grow at very high temperatures must expend energy. Which of the following observation found to be true?
A. Bacteria don’t need to expend energy to prevent their DNA from unwinding due to thermal denaturation
B. These bacterial organisms have a different topoisomerase called reverse gyrase
C. Reverse gyrase decrease the linking number of relaxed DNA in the presence of ATP
#Question id: 31185
#Unit 4. Cell Communication and Cell Signaling
#Question id: 1696
#Unit 4. Cell Communication and Cell Signaling
TCR recognition of peptide-MHC class II depends on: