Introduction to DNA
This post will be an introduction to DNA structure and replication for QCE Biology.
4.1.1 – DNA Structure and Replication
- Understand that deoxyribonucleic acid (DNA) is a double-stranded molecule that occurs bound to proteins (histones) in chromosomes in the nucleus, and as unbound circular DNA in the cytosol of prokaryotes, and in the mitochondria and chloroplasts of eukaryotic cells
- Recall the structure of DNA, including:
- Nucleotide composition
- Complementary base pairing
- Weak, base-specific hydrogen bonds between DNA strands
- Explain the role of helicase (in terms of unwinding the double helix and separation of the strands) and DNA polymerase (in terms of formation of the new complementary strands) in the process of DNA replication. Reference should be made to the direction of replication
What is DNA?
This video goes through the structure and function of DNA.
This video is a little animation on the structure of DNA.
This video goes through DNA replication.
This video is an additional resource on DNA replication.
This video goes through the role of helicase and DNA polymerase in DNA replication.