According to the current model for HIV infection, which of the following is not involved in the process of membrane fusion?

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#Question id: 28402

#Unit 5. Developmental Biology

A cell that high level of β-catenin with high concentration of nodal related protein and also have vegT and vg1 expression that type of cell undergo to the formation of which structure?

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#Question id: 88

#Unit 1. Molecules and their Interaction Relevant to Biology

Anomers can be interconverted ________.

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#Question id: 12293

#Unit 10. Ecological Principles

_______________ features of the environment determine the abundance and distribution of living things.

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#Question id: 17802

#Unit 9. Diversity of Life Forms

Which of the following was not a challenge for survival of the first land plants? 

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#Question id: 178

#Unit 1. Molecules and their Interaction Relevant to Biology

Given the pKa values of different acidic sites in cysteine, the principal ionic form which will never exist at any pH