Signalling between cells is essential for patterning of the embryo and differentiation into different cell types.  

Which of the features below is characteristic of signalling by a water soluble morphogen?  Select all options that apply.  

Water soluble morphogens: 

Looking at the image of a cross section through a developing embryo below: 

What names are given to, and what derivatives are formed by the structures labelled E?  Select all options that apply. 

Which of the following stains would you use to identify nuclei on a tissue section using fluorescence microscopy? 

Choose the CORRECT option below:

Match the following components of the cell to molecules you will find within that structure: 

What axis does the 2nd polar body define?

The hypoblast primarily forms: 

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With respect to events occurring at the earliest stages of human development:

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Which of the following are homologous structures?

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During cell division, very rapid production of the histone proteins is required. Where is the mRNA encoding these proteins translated?

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MicroRNA molecules can affect translation of particular genes.  Where will the microRNAs be transcribed?  

Choose the CORRECT option below: