TLS Online TPP Program

#Question id: 28283


Following statements are related to fast block to polyspermy, which statement is incorrect?

#Unit 5. Developmental Biology
  1. by changing the electric potential to a more positive level additional sperm binding is prevented 
  2. chemicals from the fusing sperm cytoplasm alter the sodium ion channels on the membrane
  3. after the binding of the first sperm, the membrane potential shifts from -20mV to about +70 mV
  4. Occur within 1–3 seconds
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TLS Online TPP Program

#Question id: 11821

#Unit 6. System Physiology – Plant

Immediate precursor of ethylene is___

TLS Online TPP Program

#Question id: 11822

#Unit 6. System Physiology – Plant

The rate-limiting step in the Ethylene biosynthetic pathway is____

TLS Online TPP Program

#Question id: 11823

#Unit 6. System Physiology – Plant

_____A________the enzyme that catalyzes the conversion of AdoMet to ACC, while ___B_____ catalyzes the conversion of ACC to ethylene

TLS Online TPP Program

#Question id: 11824

#Unit 6. System Physiology – Plant

Only two of the ethylene receptors in Arabidopsis have intrinsic histidine kinase activity, these receptors are_______

TLS Online TPP Program

#Question id: 11825

#Unit 6. System Physiology – Plant

Ethylene receptors are localized into the______

TLS Online TPP Program

#Question id: 11826

#Unit 6. System Physiology – Plant

Some given statements about ethylene signalling pathways are listed;

a) Ethylene receptors are interact with two downstream signaling proteins, CTR1 (CONSTITUTIVE TRIPLE RESPONSE1) and EIN3 (ETHYLENE-INSENSITIVE3)

b) CTR1 is a soluble serine/threonine kinase that is associated with ethylene receptors, while EIN2 is an ER transmembrane protein with a cytosolic C-terminal domain that is a target for CTR1 kinase activity

c) EIN2 is required to stabilize transcription factors of the EIN3 (ETHYLENEINSENSITIVE3) family, which activate the transcription of ethylene-responsive genes

d) EIN3 is required to stabilize transcription factors of the EIN2 (ETHYLENEINSENSITIVE2) family, which activate the transcription of ethylene-responsive genes

Which of the following is the correct statements  of auxin signalling pathway ?