TLS Online TPP Program

#Question id: 5118


Which of the following is not a mechanism by which cells communicate with each other?

#Unit 5. Developmental Biology
  1. transcription factors are secreted from one cell and taken up by the target cell, where they influence gene expression

  2. cell surface molecules on adjacent cells interact and initiate a signal transduction process that influences cellular behavior and gene expression

  3. cells form gap junctions with adjacent cells, allowing the passage of small molecules

  4. cells secrete proteins and small hydrophilic molecules, which interact with cell surface receptors on target cells and initiate a signal transduction process that influences cellular behavior and gene expression

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TLS Online TPP Program

#Question id: 11846

#Unit 6. System Physiology – Plant

In maize  orange pericarp (orp) mutant is

TLS Online TPP Program

#Question id: 11847

#Unit 6. System Physiology – Plant

On the basis of isotopic labeling and metabolite identification, oxidative pathways are more likely to be involved in the controlled degradation of IAA by____

Statement-I ___IAA is oxidized without decarboxylation to OxIAA

Statement-II___ IAA-aspartate conjugate is oxidized first to the intermediate dioxindole-3-acetylaspartate, and then to OxIAA

TLS Online TPP Program

#Question id: 11848

#Unit 6. System Physiology – Plant

Polar transport is specific for active auxins, such as

TLS Online TPP Program

#Question id: 11849

#Unit 6. System Physiology – Plant

According to chemiosmotic model for polar auxin transport, auxin _____A_______is driven by the______B________ across the plasma membrane, while auxin ___C_____is driven by the_________D_________

TLS Online TPP Program

#Question id: 11850

#Unit 6. System Physiology – Plant

The first step in polar transport is auxin influx. According to the model, auxin can enter plant cells from any direction by either of two mechanisms:

a) Passive diffusion of the protonated (IAAH) form across the phospholipid bilayer

b) Secondary active transport of the dissociated (IAA–) form via a 2H+–IAA– symporter

c) Active diffusion of the protonated (IAAH) form across the phospholipid bilayer

Find out the correct statements of about diffusion of IAA.

TLS Online TPP Program

#Question id: 11851

#General Aptitude

The greatest number of four digits which is divisible by 15, 25, 40 and 75 is :