TLS Online TPP Program

#Question id: 2871


With respect to X-chromosome inactivation in females, which, if any, of the following statements is incorrect?

#Unit 2. Cellular Organization
  1. X-inactivation first occurs in the preimplantation female mammalian embryo.

  2. One of the two X chromosomes in each diploid cell of a normal woman is randomly selected to undergo X-inactivation and becomes highly condensed.

  3. The process involves epigenetic silencing of each gene on one of the two X chromosomes, either the maternal X chromosome or the paternal X chromosome.

  4. Once the decision is made to inactivate a paternal X or the maternal X in a cell, all descendant cells will continue with that pattern of X-inactivation.

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TLS Online TPP Program

#Question id: 11532

#Unit 6. System Physiology – Plant

Which of the following are the primary sites of IAA synthesis?

TLS Online TPP Program

#Question id: 11533

#Unit 6. System Physiology – Plant

 IAA biosynthesis is associated with__

TLS Online TPP Program

#Question id: 11534

#Unit 6. System Physiology – Plant

Which of the following is the precursor of auxin?

TLS Online TPP Program

#Question id: 11535

#Unit 6. System Physiology – Plant

During IPA pathway in the biosynthesis of auxin using  following enzymes except_____

TLS Online TPP Program

#Question id: 11536

#Unit 6. System Physiology – Plant

IAA has been found to be conjugated to both high- and low-molecular-weight compounds such as,

a) Low-molecular-weight conjugated auxins include esters of IAA with glucose or myo-inositol and amide conjugates such as IAA-N-aspartate

b) High-molecular-weight IAA conjugates include IAAglucan and IAA-glycoproteins found in cereal seeds

c) High-molecular-weight conjugated auxins include esters of IAA with glucose or myo-inositol and amide conjugates such as IAA-N-aspartate

d) Low-molecular-weight IAA conjugates include IAAglucan and IAA-glycoproteins found in cereal seeds

Which of the following is the correct prediction about low-and high-molecular weight ?

TLS Online TPP Program

#Question id: 11537

#Unit 7. System Physiology – Animal

Testosterone is an example of a chemical signal that affects the very cells that synthesize it, the neighboring cells in the testis, along with distant cells outside the gonads. Thus, testosterone is an example of ________.

 I) an autocrine signal

 II) a paracrine signal

 III) an endocrine signal