Which statements correctly describe features of stem cells that are essential for their role in cell replacement and tissue repair? 1 After mitosis of stem cells, the daughter cells can either remain as stem cells or follow a developmental pathway that leads to the formation of specialised cells. 2 Stem cells are different to all other body cells because they retain all of the genetic information in their DNA throughout the life of the organism. 3 A small population of stem cells is retained in the body of adults throughout their life time. 4 Stem cells have more telomeres than other body cells and this allows them to undergo an unlimited number of mitotic divisions.

A nucleus in a body cell of a species of fruit fly has 8 chromosomes. How many strands of DNA are present in the nucl…

Which percentage of the chromosomal DNA present in a cell during G₁ is present in the same cell later in the same mit…

The statements are about two genes and their protein products that can have a role in tumour formation. • The protein…

Which relationships could be investigated using a colorimeter? 1 the effect of light intensity on the rate at which a…

Which transport mechanism does not require a concentration gradient to be present in order to take place?

High concentrations of ethanol disrupt cell membrane structure by denaturing proteins and increasing the separation o…