Q.1 Embryonic stem cells are derived from
- (A) fertilized embryo
- (B) unfertilized embryo
- (C) sperm
- (D) kidney
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In the fascinating world of biotechnology and regenerative medicine, embryonic stem cells are derived from early-stage embryos, holding immense promise for treating diseases like Parkinson’s and diabetes. If you’re studying molecular biology or preparing for exams, understanding their origin is crucial. This article answers the multiple-choice question: Embryonic stem cells are derived from (A) fertilized embryo, (B) unfertilized embryo, (C) sperm, or (D) kidney—with the correct answer, detailed explanations, and key insights into stem cell science.
The Correct Answer: Option (A) Fertilized Embryo
Embryonic stem cells are derived from the inner cell mass of a fertilized embryo, specifically at the blastocyst stage (around 4-5 days post-fertilization).
A fertilized embryo forms when a sperm penetrates an egg, creating a zygote that divides into a blastocyst. Scientists isolate pluripotent stem cells from this inner cluster, which can differentiate into any cell type. This derivation process, pioneered in mice (1981) and humans (1998), revolutionized bioengineering. These cells are “totipotent” or “pluripotent,” enabling research in tissue engineering and gene therapy.
Why Not the Other Options? Detailed Breakdown
Let’s examine each incorrect option to clarify common misconceptions in microbiology and cell biology.
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(B) Unfertilized embryo: Incorrect. An unfertilized embryo (like an oocyte or egg) lacks the genetic material from sperm, so it can’t form a blastocyst with pluripotent cells. Parthenogenesis (egg activation without sperm) occurs in some animals but doesn’t yield true embryonic stem cells in humans—those require fertilization for full developmental potential.
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(C) Sperm: Incorrect. Sperm cells are haploid gametes focused on fertilization, not stem cell production. They carry half the DNA and lack pluripotency. While sperm stem cells (spermatogonial stem cells) exist in testes for sperm renewal, they differ vastly from embryonic stem cells in potency and origin.
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(D) Kidney: Incorrect. Kidney-derived cells, like mesenchymal stem cells from adult tissues, are multipotent (limited differentiation) and come from somatic organs, not embryos. Embryonic stem cells’ unique pluripotency stems from their embryonic source, not adult organs like the kidney.
Option Source Description Stem Cell Type Potency Level Why Incorrect/Correct (A) Fertilized embryo Blastocyst inner cell mass Embryonic stem cells Pluripotent Correct: True origin for versatile stem cells (B) Unfertilized embryo Oocyte/egg None (or parthenogenetic) Limited/none Lacks sperm DNA for full embryo development (C) Sperm Male gamete Spermatogonial (adult) Unipotent Not pluripotent; reproduction-focused (D) Kidney Adult organ tissue Mesenchymal (adult) Multipotent Somatic, not embryonic source Why This Matters in Biotechnology and Research
Understanding that embryonic stem cells are derived from fertilized embryos highlights ethical debates (e.g., embryo destruction) and alternatives like induced pluripotent stem cells (iPSCs) from adult cells. In India, institutions like CCMB Hyderabad advance this field for drug testing and personalized medicine.
For students in biochemistry or bioengineering, mastering this boosts exam prep and research skills. Fun fact: These cells grow indefinitely in culture, mimicking microbial fermentation kinetics in bioprocess engineering.
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