The Somatic Cell Nuclear Transfer technique has the potential to be used to reproduce extinct species.
Explanation:
Somatic cell nuclear transfer (SCNT) involves the nucleus from a somatic body cell being transferred to the cytoplasm of an enucleated egg (an egg that has had its own nucleus removed). Once the somatic nucleus is inside the egg it is reprogrammed by egg cytoplasmic factors to become a fertilized egg (zygote) nucleus. The egg is allowed to develop to the blastocyst stage where embryonic stem cells can be created from the inner cell mass of the blastocyst. Mouse, monkey and human embryonic stem cells have been made using SCNT.
Reproductive cloning occurs by implanting a SCNT derived blastocyst into the uterus of a surrogate mother, where the embryo develops into a fetus.
The SCNT technique was used to create the first cloned mammal, Dolly the sheep.
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.
Destruction of animals' habitats. Some examples of this are... tree logging, slash and burn farming, and deforestation. Humans also hunt animals to extinction either for sport or food.
Explanation: this is one of the various ways in which the immune system fights against bacteria and other pathogenic organisms. It does this by extending its plasma membrane outwards forming a structure like a pseudopodia which it utilises to engulf the invading organism.
