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TLS Online TPP Program

#Question id: 679

b sandwich forms when

#Unit 1. Molecules and their Interaction Relevant to Biology

  1. two hydrophobic sides of b-sheets interact.

  2. two hydrophilic sides of b-sheets interact.

  3. an a-helix separates two b-sheets.

  4. two amphipathic a-helices interact.

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TLS Online TPP Program

#Question id: 12973

#Unit 10. Ecological Principles

The oceans affect the biosphere in all of the following ways except 
TLS Online TPP Program

#Question id: 12965

#Unit 10. Ecological Principles

Phytoplankton is most frequently found in which of the following zones?
TLS Online TPP Program

#Question id: 5017

#Unit 11. Evolution and Behavior

Arrange these events from earliest to most recent.

1.  emission of lava in what is now Siberia at time of Permian extinctions

2.  emission of lava that solidified at the same time as iron-bearing terrestrial rocks began to rust

3.  emission of lava that solidified at the same time as rusted iron precipitated from seawater

4.  emission of lava in what is now India at time of Cretaceous extinctions
TLS Online TPP Program

#Question id: 12091

#Unit 10. Ecological Principles

Which of the following is a postzygotic isolating mechanism in speciation?
TLS Online TPP Program

#Question id: 5243

#Unit 8. Inheritance Biology

Auxotroph culture (His- and Lac-) culture of E. coli was mutagenised. On what media would one spread the mutagenised cells to select prototroph for both His+  and Lac+ cells?