Steem cells

Question 1

what is stem cells

Answer 1

The unspecialized cells from which differentiated cells develop are known as Stem cells

Question 2

Blastocyst,

Answer 2

After about four days of development, a human embryo forms into a Blastocyst, a hollow ball of cells
with a cluster of cells inside known as the inner cell mass.

Question 3

Pluripotent stem cells

Answer 3

The cells of the inner cell mass are said to be Pluripotent stem cells, which means that they are
capable of developing into many, but not all, of the body’s cell types.
5-14 days old

Question 4

Totipotent

Answer 4

Each cell can develop into a new individual. Cells from early (1-3 days) embryos

Question 5

Multipotent

Answer 5

Cells differentiated, but can form a number of other tissues. Fetal tissue, cord blood, and adult stem cells
14 day old embryo

Question 6

Embryonic stem cells

Answer 6

Are found in the inner cells mass of the early embryo.
• Embryonic stem cells are pluripotent.
• Researchers have grown stem cells isolated from human embryos in culture. Their experiments
confirmed that embryonic stem cells have the capacity to produce most cell types in the human
body

Question 7

Adult stem cells

Answer 7

Adult stem cells are undifferentiated cells found among specialized or differentiated cells in a tissue or
organ after birth and it appear to have a more restricted ability to produce different cell types and to
self-renew. Adult stem cells are multipotent. They can produce many types of differentiated cells.
• Adult stem cells of a given organ or tissue typically produce only the types of cells that are unique to
that tissue.

Question 8

characters of nerve cells

Answer 8

3 different type; oligodendrocyte, astrocyte, neurons

Question 9

Posotional cloning

Answer 9

Positional cloning is a laboratory technique used to locate the position of a disease-associated gene along the chromosome. … It involves the isolation of partially overlapping DNA segments that progress along the chromosome toward a candidate gene.

Question 10

techniques to study gene expression

Answer 10

laboratory techniques such as a Northern blot or serial analysis of gene expression (SAGE). Both of these techniques make it possible to identify which genes are turned on and which are turned off within cells.