This animation takes you through a tour of a typical human cell, moving from larger to smaller cell structures (i.e., from nucleus to chromosomes to DNA strands and their bases). It briefly describes some of these structures and describes how DNA strands are constructed. This animation can be used as an introduction to the study of chromosomes and DNA.
Students should know that cells are the fundamental working units of every living system. All the instructions needed to direct their activities are contained within the chemical DNA (deoxyribonucleic acid). Emphasize to students that genes are specific sequences of bases that encode instructions on how to make proteins.