Which of the following steps has not yet been accomplished by scientists studying the origin of life? 

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#Question id: 15739

#Unit 5. Developmental Biology

 In mammals, If no Y chromosome is present then transcription factors Wt1, Lhx9, GATA4, and Sf1 activate expression of:

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#Question id: 2315

#Unit 2. Cellular Organization

The function of the Golgi apparatus is to

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#Question id: 7166

#Unit 5. Developmental Biology

Just prior to the onset of gastrulation in an embryo, the "organizer" cells are specified. If you were to experimentally block the specification of these cells, what would you expect the result to be in the developing embryo?

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#Question id: 27571

#Unit 1. Molecules and their Interaction Relevant to Biology

As atom "A" approaches, the electrons of atom "B" will be attracted by the positive end of atom "A". As a result, the electrons of atom "B" will migrate to the left side and make the left side slightly negative, such given condition leads to the formation of

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#Question id: 33434

#Unit 1. Molecules and their Interaction Relevant to Biology

How many precursors are involved in synthesis of amino acids