You Are Analyzing the Transmembrane Proteins in Cells from a Developing

question 109

Multiple Choice

You are analyzing the transmembrane proteins in cells from a developing mouse embryo and find that there are many integrins in the membrane and also in the cytoplasm.How would you explain their presence in the cytoplasm, given what you know about the roles of integrins?

• A) The integrins are removed from the membrane and sent to the cytoplasm to be digested as a source of nutrients.
• B) Integrins are recycled through the cytoplasm after serving to transport developing cells in the embryo.
• C) The extracellular matrix is too immature for integrins to attach, so they must stay in the cytoplasm.
• D) A developing embryo requires additional integrins for the cytoskeleton.
• E) Integrins are not needed during embryo development and are stored in the cytoplasm for later use.

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