TLS Online TPP Program

#Question id: 1086


What is the most likely mechanism by which testosterone functions inside a cell?

#Unit 4. Cell Communication and Cell Signaling
  1. It acts as a signal receptor that activates tyrosine kinases.

  2. It binds with a receptor protein that enters the nucleus and activates expression of specific genes.

  3. It acts as a steroid signal receptor that activates ion channel proteins in the plasma membrane.

  4. It coordinates a phosphorylation cascade that reduces spermatogenesis.

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TLS Online TPP Program

#Question id: 21257

#Unit 12. Applied Biology

Lysine is a member of the_______________of amino acids.

TLS Online TPP Program

#Question id: 21258

#Unit 12. Applied Biology

Some classes of mutants were obtained from the parental strain as the source of genetic material for transduction:
I) A strain that are resistance to thialysine
II) A strain in which both the threonine-regulated AK and HD were resistant to feedback inhibition by threonine
III) A strain is selected for ß-hydroxynorvaline Sensitive, in which HDI was sensitive to both inhibition and repression and the threonine-regulated AK was constitutively synthesized 

TLS Online TPP Program

#Question id: 21259

#Unit 12. Applied Biology

Production of l-Threonine amino acid used for feeding pigs and poultry, Starting from l-aspartate, the pathway involves five steps catalyzed by five enzymes sequence of using enzyme is that;

TLS Online TPP Program

#Question id: 21260

#Unit 12. Applied Biology

L-Cysteine has traditionally been obtained by extracting it from acid hydrolysates of human hair and animal feathers. High levels cannot be synthesized from glucose because l-cysteine feedback inhibits the enzyme, which catalyzes one of the steps in the biosynthesis of l-cysteine. These enzyme are,

TLS Online TPP Program

#Question id: 21261

#Unit 12. Applied Biology

A copy of the gene encoding enzyme, which is the rate-limiting enzyme in the normal tryptophan biosynthetic pathway is,

TLS Online TPP Program

#Question id: 21262

#Unit 12. Applied Biology

A constitutive promoter derived from the cauliflower mosaic virus is__