Which of the following is true of stem cells? A = Yes. B = No 1. Stem cells are

Question

Which of the following is true of stem cells? A = Yes. B = No 1. Stem cells are found in embryos, and are not present in adult tissues or organs. 2. Some of the time, stem cells are quiescent, and are not dividing or differentiating. 3. Stem cells can be triggered to undergo self-renewal divisions where they divide to form more stem cells, but do not differentiate at that time. Stem cells divide and differentiate to replace old cells and cells lost to injury or disease. You are studying a developing chick embryo (diagram shown below) and decide to isolate a cell and figure out what kind of cell it is. Your tests find that: There is an SR receptor in the membrane The ID genes are being expressed TF of the Skin Differentiation pathway is being expressed The Skin DIFF genes are not being expressed TF of the Neuron DIFF pathway is in the cytoplasm Which of the signals must have been received by this cell? A. SR signal only B. SR signal and Skin signal C. SR signal and Neuron signal This cell is most likely A. A non-dividing stem cell B. A dividing stem cell C. A differentiating skin cell D. A differentiating neuron cell What else is most likely true of these cells? (A = Yes; B = No) The DET genes are being expressed 8. The Neuron (DIFF) genes are being expressed TF for the Skin pathway is phosphorylated TF of the Skin pathway is in the nucleus TF of the neuron differentiation pathway was targeted for proteolysis

Explanation / Answer

answers:

1) A = yes

2) A= yes

3) A= yes

4) B = No

5) B

6) C

7) B=no

8) B=no

9) A=Yes

10) A=yes

11) A=yes

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