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icq4 - MCDB 4650 Class 4 Answers to in class questions What...

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MCDB 4650 Class 4 Answers to in class questions
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What does it mean (molecularly) when we say that a cell is “determined” to take on a particular fate? a. It can still make a different fate if given the right signals b. It is actively translating cell-specific proteins c. It has received the signals required for its fate d. It can no longer respond to certain signals e. It has differentiated into its known fate
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Different states of determination in response to a gradient of a diffusible ligand called a morphogen gradient of a diffusible ligand, called a morphogen Concentration of morphogen decreases with distance from source of signal Signaling cell with distance from source of signal. secretes ligand Were these cells along the bottom equivalent before the morphogen reached them? a. Yes b. No c. Maybe Equivalent: only the exposure to different amounts of morphogen changes their fate Different: the presence of different proteins could trigger different response thresholds
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