Multiple choice

Embryonic stem cells are derived from

  1. fertilized embryo

  2. unfertilized embryo

  3. sperm

  4. kidney
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Embryonic stem cells (ESCs) are derived from the inner cell mass of a fertilized embryo at the blastocyst stage (approximately 5-7 days post-fertilization in humans). Option A is correct. Unfertilized embryo (B) is a contradiction in terms - an embryo by definition results from fertilization. ESCs cannot be derived from sperm (C) alone or adult tissues like kidney (D) - those would be adult stem cells if any. The key feature of ESCs is their pluripotency, derived from the earliest stages of embryonic development after fertilization has occurred.

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