Question

3) Embryonic Stem Cells (ESCs) from the inner cell mass of a blastocyst are very valuable for medical research, they are defined as which type of stem cell?

A) Totipotent B) Pluripotent C) Multipotent D) All of these are correct

Answer 1

Ans)D

All the above are correct.

Stem cells.

stem cells and multiply and differentiate into every cell in the human body within the human body.

There are classifications for stem cells

a) based on differentiation

b) based on collection during human life cycle.

based on differentiation they are classified into three as

1. totipotent

2.pluripotent

3.multipotent

Based on collection during human life cycle they are classified as

1. embryonic stem cells

2.prenatal stem cells

3.post natal stem cells

4.Adult stem cells.

prenatal and postnatal are called also called perinatal stem cells.

Induced pluripotent and cancer stem cells are result of research.

Totipotent stem cells

that have the capacity to form an entire organism

Pluripotent stem cells

can give rise to most, but not all, tissues within an organism

Multipotent stem cells

They are undifferentiated cells that are limited to giving rise to specific populations of cells.

Human embryonic stem cells are totipotent cells that are derived from embryos that have been created in vitro at the fertility clinic

Embryonic stem cells are typically collected shortly after fertilization (within 4-5 days ).

At 5 to 6 days after fertilization embryonic stem cells begin to specialize, at which point they become pluripotent or multipotent cells

The precise point at which a stem cell switches from a totipotent stem cell to a pluripotent or multipotent stem cells is often unclear.