Answer:
Embryonic stem cells, Adult stem cells, Induced pluripotent stem cells (iPSCs), Cord blood stem cells
, and Amniotic fluid stem cells
Explanation:
Identical twins may have less in common than they think. A study now shows that the expression of their genes gets more and more different with age.
The findings could help to explain why one twin may develop a genetically influenced disease, such as diabetes, while the other remains perfectly healthy.
Identical twins have identical genes, because they are born of an embryo that splits at a very early stage in development. Such twins are often indistinguishable in outward appearance. But over the course of time they may experience radically dissimilar health.
Most scientists have assumed that environmental and lifestyle differences cause such divergence. These things trigger chemical reactions that affect our DNA and the proteins entwined with our DNA, called histones. One such reaction, known as methylation, influences the expression of genes and so can have an impact on health.
<span>Cell membranes serve as barriers and gatekeepers. They are semi-permeable, which means that some molecules can diffuse across the lipid bilayer but others cannot</span>
Answer:
DNA changes in a gene are called mutations. ... The environment can also cause DNA mutations. Sunlight, cigarette smoke, and radiation are all known to cause changes to our DNA. These are also random and can happen anywhere in the DNA sequence.
Predator and prey relationship is call predation. the predator kills the prey for consumption. parasitic relationship does not kill anyone. the parasite only hurts the host organism but does not kill it