Problem:

Question 1: What would most likely happen if a stem cell were unable to differentiate?

1. It would undergo morphogenesis from many undifferentiated cells.
2. It would remain a single, undifferentiated stem cell.
3. It would divide into many undifferentiated stem cells.
4. It would divide into many different cells identical to the egg cell.
5. It would divide into many of one type of differentiated cell.

Question 2: Which of the following is an example of a totipotent cell?

1. a hematopoietic stem cell
2. an inner cell mass cell
3. an embryonic stem cell
4. an induced pluripotent stem cell
5. a fertilized egg

Question 3: Which of the following is a step in apoptosis that can be a potential target for therapeutic intervention?

1. the binding of signals to the death receptors of the extrinsic pathway
2. activation of the caspase cascade
3. the processing of cellular proteins by effector caspases
4. All of the answers are correct.
5. All of the answers are incorrect.

Question 4: Which of the following is a source for human stem cells?

1. blastocysts and embryos only
2. adult bone marrow and skin cells
3. embryos and adult somatic cells
4. embryos only
5. adult somatic cells only

Please select correct answer and also provide explaination.