Question 1

Which step in the process depicted in the diagram is essential for generating patient-specific embryonic stem cells for therapeutic purposes?

Accepted Answer

Removing the inner cell mass from the blastocyst stage cloned embryo

Question 2

In the nuclear transfer process shown, what is the primary purpose of using an enucleated egg?

Accepted Answer

To provide mitochondria and cytoplasmic factors necessary for reprogramming the somatic nucleus

Question 3

Which of the following best describes the type of stem cells produced after culturing the inner cell mass from the blastocyst stage cloned embryo?

Accepted Answer

Pluripotent stem cells

Question 4

If the somatic cell used for nuclear transfer contains a genetic mutation, what is the likely outcome for the derived embryonic stem cells?

Accepted Answer

The embryonic stem cells will carry the same genetic mutation as the somatic cell

Question 5

Which equation best represents the probability $$P of $$successful nuclear transfer if the probability of enucleation is $$p_1$$ and the probability of somatic cell fusion is $$p_2$$?

Accepted Answer

$$P = p_1$ 	imes p_2$

Question 6

What is the main ethical concern associated with the process illustrated in the diagram?

Accepted Answer

The destruction of the blastocyst to obtain embryonic stem cells

Question 7

Which of the following is a potential advantage of using patient-derived embryonic stem cells for transplantation?

Accepted Answer

Reduced risk of immune rejection

Question 8

If the cultured embryonic stem cells are differentiated into nerve cells, which property must they retain to be considered functional for transplantation?

Accepted Answer

Ability to generate action potentials

Question 9

Which step in the diagram is analogous to the process used in cloning animals such as Dolly the sheep?

Accepted Answer

Nuclear transfer of a somatic cell into an enucleated egg

Question 10

If the efficiency of producing healthy cells from embryonic stem cells is $$e$$, and the probability of successful transplantation is $$t$$, what is the overall probability $$P_{total} of a $$successful therapy?

Accepted Answer

$$P_{total} = e 	imes t$$

Question 11

Which of the following best explains why the inner cell mass is removed from the blastocyst stage cloned embryo?

Accepted Answer

To isolate pluripotent stem cells for culture and differentiation

Question 12

What is the primary difference between the cells produced by this process and cells obtained from adult stem cells?

Accepted Answer

Embryonic stem cells are pluripotent, while most adult stem cells are multipotent or unipotent

Question 13

If a patient has a mitochondrial disorder, why might the process depicted not fully cure their disease?

Accepted Answer

The enucleated egg provides mitochondria, which may carry the original mitochondrial disorder

Question 14

Which of the following is a limitation of using the process shown for regenerative medicine?

Accepted Answer

Low efficiency and ethical concerns regarding embryo destruction

Question 15

If the probability of successful differentiation into muscle cells is $$d$$, and the probability of survival after transplantation is $$s$$, what is the probability $$P$$ that a transplanted muscle cell survives?

Accepted Answer

$$P = d 	imes s$$

Question 16

Which of the following best describes the role of nuclear transfer in the process shown?

Accepted Answer

It reprograms the somatic cell nucleus to a pluripotent state

Question 17

What is the significance of culturing embryonic stem cells before producing desired healthy cells?

Accepted Answer

It allows expansion and differentiation into multiple cell types

Question 18

Which of the following steps is NOT required for the process depicted in the diagram?

Accepted Answer

Direct injection of somatic cells into the patient without reprogramming

Question 19

If the probability of successful nuclear transfer is $$p$$, and the probability of blastocyst formation is $$b$$, what is the probability $$P of $$obtaining a blastocyst from a nuclear transfer?

Accepted Answer

$$P = p 	imes b$$

Stem Cells, Cellular Reprogramming, and Viruses: Mechanisms and Applications

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