TLS Online TPP Program

#Question id: 4001


Which is not true about the lac repressor?

#Unit 3. Fundamental Processes
  1. Its gene is part of the lac operon and is transcribed along with lacZ, lacA and lacY.

  2. When it binds to DNA, it forms a loop-type structure.

  3. It likely blocks both RNA polymerase binding as well as transcription initiation.

  4. It binds to DNA by interaction of an α-helix with the major groove.

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TLS Online TPP Program

#Question id: 10760

#Unit 6. System Physiology – Plant

Following are some statements of secondary metabolites of terpenes in plants is incorrect?

TLS Online TPP Program

#Question id: 10761

#Unit 6. System Physiology – Plant

Which one of the following combinations of secondary metabolite biosynthetic pathway found in the biosynthesis of terpenes?

TLS Online TPP Program

#Question id: 10762

#Unit 6. System Physiology – Plant

The following are certain statements about secondary metabolites:

a) They protect plants against being eaten by herbivores and against being infected by microbial pathogens

b) Terpenes, are the class of secondary metabolites are synthesized by methyl erythritol phosphate(MEP) pathway and Mevalonic acid pathway

c) Terpenes, are the class of secondary metabolites are synthesized by methyl erythritol phosphate(MEP) pathway and sikkimic acid pathway

Which one of the following combinations of the above statements is correct?

TLS Online TPP Program

#Question id: 10763

#Unit 6. System Physiology – Plant

In mevalonic acid pathway, three molecules of acetyl-CoA are joined together stepwise to form mevalonic acid, which intermediate steps it will perform to yield isopentenyl diphosphate (IPP2)?

TLS Online TPP Program

#Question id: 10774

#Unit 6. System Physiology – Plant

Following are a few statements regarding the structure of terpenes:

a) Isopentenyl diphosphate and Dimethyallyl diphosphate are combinely called monoterpene, respectively

b) Isopentenyl diphosphate and Farnesyl diphosphate are Sesquiterpenes and Tetraterpenes

c) Monoterpenes, Sesquiterpenes and Diterpenes have 10, 20  and 30 carbons, respectively

d) Grenyl grenyl diphosphate usually have 20 carbons compound by multiplying with  2X is known as testraterpenes

Which combination of the above statements is correct?

TLS Online TPP Program

#Question id: 10775

#Unit 6. System Physiology – Plant

Geranyl diphosphate is a precursor of which plant hormone biosynthesis?