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TLS Online TPP Program

#Question id: 7246

Treatment of Xenopus embryos with lithium dorsalizes the embryos by interfering with cell-cell signaling pathways. What, if anything, is the effect of lithium on hydra, and what might we infer about its mechanism of action?

#Unit 5. Developmental Biology
  1. Lithium has no effect in hydra
  2. Lithium dorsalizes hydra just as it does Xenopus, so we would assume its mechanism of action is identical in the two organisms
  3. Lithium causes the formation of extra basal discs, which we might infer arise through interference with cell-cell signaling pathways
  4. Lithium causes the formation of extra head regions, since the head of hydra is mechanistically analogous to the dorsal side of Xenopus embryos
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TLS Online TPP Program

#Question id: 28043

#Unit 1. Molecules and their Interaction Relevant to Biology

Which of the following statement holds true for the hydrogen and hydrophobic interaction in protein folding 
(1) The Hydrophobic Effect Has the minimal Influence on Protein Stability
(2) The Hydrophobic Effect Has the Greatest Influence on Protein Stability
(3) Hydrogen bonds, which are central features of protein structures, make only minor contributions to protein stability
(4) Hydrogen bonds, which are central features of protein structures, makes major contributions to protein stability
TLS Online TPP Program

#Question id: 28044

#Unit 1. Molecules and their Interaction Relevant to Biology

Which one of the following is INCORRECT about protein structures?
TLS Online TPP Program

#Question id: 28045

#Unit 1. Molecules and their Interaction Relevant to Biology

Native proteins are 
TLS Online TPP Program

#Question id: 28046

#Unit 1. Molecules and their Interaction Relevant to Biology

Protein stability depend on interactions which one of the following is correctly representing the increasing order of contribution
TLS Online TPP Program

#Question id: 28047

#Unit 1. Molecules and their Interaction Relevant to Biology

Protein A will fold into its native state only when protein B is also present in the solution. However, protein B can fold itself into native confirmation without the presence of protein A. Which of the following is true? 
TLS Online TPP Program

#Question id: 28048

#Unit 1. Molecules and their Interaction Relevant to Biology

As folding progresses which of the following does not take place?