True/False - predict whether each statement is true or false.

1 - Cloning occurs in nature as well as in a laboratory.

2 - Nuclear transfer involves replacing the nucleus of a fertilized egg with the nucleus of a cell from the animal that is being cloned.

3 - Dolly the sheep was the first mammal cloned from an embryonic cell.

4 - HeLa cells stop dividing after five divisions.

5 - It is a benefit in cystic fibrosis to use gene therapy to introduce a copy of the gene into the cell that produces a normal functioning protein.

6 - There is no risk for herbicide-resistant crops to receive genes for resistance to the herbicide.