TLS Online TPP Program

#Question id: 23109


What is the similarities between RNA polymerase and scaffolds 

#Unit 2. Cellular Organization
  1. Both are histone 
  2. Both are non-histone
  3. Both are associated to euchromatin region only
  4. RNA polymerase and scaffolds have no role in control of gene expression and higher order structure.
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TLS Online TPP Program

#Question id: 12397

#Unit 6. System Physiology – Plant

when auxin binds to its receptor is the activation of a select group of transcription factors. The activated transcription factors enter the nucleus and promote the expression of specific genes. Genes whose expression is stimulated by the activation of pre-existing  transcription factors are called primary response genes or early genes. 
a) Some of the early genes encode proteins that regulate the transcription of secondary response genes, or late genes, that are required for the short-term responses to the hormone
b) Early genes are involved in intercellular communication, or cell-to-cell signaling and some also involved in adaptation to stress
c) Secondary response genes are required for the long-term responses to the hormone. Because late genes require de novo protein synthesis, their expression can be blocked by protein synthesis inhibitors
d) Early-gene expression can also be blocked by inhibitors of protein synthesis such as cycloheximide, the time required for the expression of the early genes can be quite short, ranging from a few minutes to several hours
Which of the following is the correct prediction about primary response gene?

TLS Online TPP Program

#Question id: 12398

#Unit 6. System Physiology – Plant

Early auxin-responsive genes have been identified as ___
I. Genes involved in auxin-regulated growth and development
II. Gene involved in Stress response 
Given some genes below which are identified as auxin regulated growth as well as stress response gene;
a) glutathione S-transferases
b) AUX/IAA gene family
c) 1-aminocyclopropane-1-carboxylic acid (ACC) synthase
d) GH3 gene family
e) SAUR gene family
Which one of the following combination from the above early auxin responsive gene is correct?

TLS Online TPP Program

#Question id: 12399

#Unit 6. System Physiology – Plant

Early auxin genes are regulated by___

TLS Online TPP Program

#Question id: 12400

#Unit 6. System Physiology – Plant

Given  some  statements  about auxin  signal  transduction  pathway;
a) ARFs bind the AuxRE stably, must form dimers promote transcription by binding to two AuxREs arranged in a palindrome
b) inactive heterodimers may act to inhibit ARF–AuxRE binding, thereby blocking either gene activation or repression
c) Protein encodes the AUX/IAA gene family can inhibit the transcription of early auxin response genes by forming inactive heterodimers with ARFs
d) Auxin induces the transcription of the early response genes by promoting the proteolytic degradation of the inhibitory AUX/IAA proteins so that active ARF dimers can form
e) AUX/IAA turnover to involve ubiquitination by a ubiquitin ligase and proteolysis by the massive 26S proteasome complex
f) A negative feedback loop is introduced into the pathway by virtue of the fact that one of the gene families turned on by auxin is AUX/IAA, which inhibits the response.
Find out the correct sequence from the following above statements;

TLS Online TPP Program

#Question id: 12401

#Unit 6. System Physiology – Plant

IAA enters the cell either passively in the undissociated form (IAAH) or by transporter in the anionic form (IAA-) , which one of the following  transporter are involved in influx of the anionic form of auxin?

TLS Online TPP Program

#Question id: 12402

#Unit 6. System Physiology – Plant

According to the Cholodny–Went model of phototropism, the tips of grass coleoptiles have specialized functions such as
a) Production of auxin
b) Perception of a unilateral light stimulus
c) Lateral transport of IAA in response to the phototropic stimulus
Which of the following given above functions is correct?