Invagination of the Sea Urchin Blastula

question 42

Multiple Choice

Invagination of the sea urchin blastula

• A) is preceded by changes in the shape of individual blastomeres.
• B) involves the filopodia of secondary mesenchyme cells.
• C) is due to the uneven distribution of various transcriptional regulatory proteins in the egg cytoplasm.
• D) forms the archenteron.
• E) All of the above

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