Final answer:
Enantiomers are mirror images of each other and have the same chemical structure and bonds, but differ in their three-dimensional arrangement of atoms. D-alanine and L-alanine are examples of enantiomers.
Step-by-step explanation:
Enantiomers are molecules that share the same chemical structure and chemical bonds but differ in the three-dimensional placement of atoms so that they are non-superimposable mirror images. For example, D-alanine and L-alanine are enantiomers found in bacterial cell walls and human cells, respectively. Enantiomers are mirror images of each other and have the same chemical structure and bonds, but differ in their three-dimensional arrangement of atoms. D-alanine and L-alanine are examples of enantiomers.