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TLS Online TPP Program

#Question id: 1091

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?

#Unit 4. Cell Communication and Cell Signaling

  1. Only target cells retain the appropriate genes regulated by testosterone.

  2. Intracellular receptors for testosterone are present only in target cells.

  3. Only target cells possess the cytosolic enzymes that transduce the signal from testosterone to adenylyl cyclase.

  4. Only in target cells is testosterone able to initiate the phosphorylation cascade leading to activated transcription factor.

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TLS Online TPP Program

#Question id: 19830

#Unit 12. Applied Biology

The expression of avr gene must be precisely regulated: it must be expressed immediately following pathogen attack but only in
TLS Online TPP Program

#Question id: 19831

#Unit 12. Applied Biology

Expression of the avr gene would produce the elicitor that would be recognized by the corresponding R gene product; this recognition will initiate and culminate in
TLS Online TPP Program

#Question id: 19832

#Unit 12. Applied Biology

The single component system is based on the expression of a toxic polypeptide in response to
TLS Online TPP Program

#Question id: 19840

#Unit 13. Methods in Biology

Match the following source of thermostable DNA polymerase with proofreading (3’−5’ exonuclease) activity;

DNA PolymeraseSources
A- Tmai) Pyrococcus furiosus
B- Deep Vent™ii) Pyrococcus woesi
C- Tliiii) Thermotoga maritima
D- Pfuiv) Pyrococcus sp.
E- Pwov) Thermococcus litoralis
TLS Online TPP Program

#Question id: 19841

#Unit 13. Methods in Biology

Which of the following is true regarding Reverse transcriptase ?
TLS Online TPP Program

#Question id: 19842

#Unit 13. Methods in Biology

Primer-Dimer leads to the formation of ___
a) Inter-complemetary primers
b) Hybrid 
c) Amplicons