Pluripotent stem cells are best described as cells that can differentiate into almost all types of tissues and cells in the body.

Pluripotent stem cells are best described as cells that can differentiate into almost all types of tissues and cells in the body.

• A. Stem cells that can differentiate into any type of specialised cells found in organisms of that species.
• B. Stem cells that can differentiate into almost all types of tissues and cells in the body.
• C. Stem cells that can become a limited number of types of tissues.
• D. Stem cells that can form only nerve tissue.

Answer: (B)

Pluripotent stem cells can form cell types from all three germ layers—ectoderm, mesoderm, and endoderm—so they can differentiate into many different tissues and organs of the body. This breadth comes from their origin in the inner cell mass of the blastocyst, which gives rise to most body tissues, while they cannot form extraembryonic structures like the placenta. Therefore, describing them as capable of becoming almost all tissues and cells in the body captures their wide developmental potential without reaching into placenta, which they do not form. Other statements are less accurate for describing pluripotent cells: one suggesting they become any type of specialized cell in the organism would imply including extraembryonic tissues like the placenta, which pluripotent cells cannot form; statements about a limited number of tissue types or only nerve tissue describe more restricted stem cell types, such as multipotent or neural stem cells.

Pluripotent stem cells can form cell types from all three germ layers—ectoderm, mesoderm, and endoderm—so they can differentiate into many different tissues and organs of the body. This breadth comes from their origin in the inner cell mass of the blastocyst, which gives rise to most body tissues, while they cannot form extraembryonic structures like the placenta. Therefore, describing them as capable of becoming almost all tissues and cells in the body captures their wide developmental potential without reaching into placenta, which they do not form.

Other statements are less accurate for describing pluripotent cells: one suggesting they become any type of specialized cell in the organism would imply including extraembryonic tissues like the placenta, which pluripotent cells cannot form; statements about a limited number of tissue types or only nerve tissue describe more restricted stem cell types, such as multipotent or neural stem cells.