Question:
According to the article, Sangwan-Vemuganti team's cutting-edge procedure of implanting cornea grown from stem cells is considered a major advancement by the experts because
According to the article, Sangwan-Vemuganti team's cutting-edge procedure of implanting cornea grown from stem cells is considered a major advancement by the experts because
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Contrast the phrase "not ones derived from embryos" with what other teams elsewhere are attempting, and note the team's success is specific to corneas.
Updated On: Jul 14, 2026
- They derive stem cells from embryos.
- Their labs are customised to grow stem cells.
- They regrow cells in hearts, brains, livers with stem cells from tissues of living adults.
- They derive stem cells from tissues of living adults and grow cells in labs.
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The Correct Option is D
Solution and Explanation
Step 1: Understand what the question is asking.
The question asks why experts see the Sangwan-Vemuganti procedure as a major advance. The answer has to come straight from what the passage says makes their method different from other stem cell work happening elsewhere.
Step 2: Locate the relevant lines in the passage.
The passage says the team "uses stem cells found in the tissues of living adults, not ones derived from embryos," and that they grow these cells into working corneal tissue in the lab, with about 80 successful procedures a year.
Step 3: Match this against the options.
Option 1 is wrong because the passage explicitly rules out embryonic stem cells. Option 2 is wrong because the advance is not about customised labs, it is about the source and success of the cells. Option 3 is wrong because regrowing hearts, brains and livers is what other teams around the world are attempting with slow progress, not what Sangwan and Vemuganti achieved; their success is specifically with corneas. Option 4 correctly states that they take stem cells from living adults and grow them into functioning tissue in the lab, which is exactly what the passage credits as the breakthrough.
Final Answer:
The team's advance lies in using adult, not embryonic, stem cells and successfully growing them into corneal tissue in the lab. \[ \boxed{\text{They derive stem cells from tissues of living adults and grow cells in labs}} \]
The question asks why experts see the Sangwan-Vemuganti procedure as a major advance. The answer has to come straight from what the passage says makes their method different from other stem cell work happening elsewhere.
Step 2: Locate the relevant lines in the passage.
The passage says the team "uses stem cells found in the tissues of living adults, not ones derived from embryos," and that they grow these cells into working corneal tissue in the lab, with about 80 successful procedures a year.
Step 3: Match this against the options.
Option 1 is wrong because the passage explicitly rules out embryonic stem cells. Option 2 is wrong because the advance is not about customised labs, it is about the source and success of the cells. Option 3 is wrong because regrowing hearts, brains and livers is what other teams around the world are attempting with slow progress, not what Sangwan and Vemuganti achieved; their success is specifically with corneas. Option 4 correctly states that they take stem cells from living adults and grow them into functioning tissue in the lab, which is exactly what the passage credits as the breakthrough.
Final Answer:
The team's advance lies in using adult, not embryonic, stem cells and successfully growing them into corneal tissue in the lab. \[ \boxed{\text{They derive stem cells from tissues of living adults and grow cells in labs}} \]
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