7.1 DNA Structure

Question 1

Outline the structure of nucleosome

Answer 1

Nucleosome = DNA wrapped twice around 8 histone protein, another histone protein bonds the structure together

Question 2

What do nucleosomes help do?

Answer 2

-supercoil chromosomes and help to regulate transcription

Question 3

Describe the structure of DNA including antiparallel strands, 3’-5’ linkages, and hydrogen bonding between purines and pyrimidines+**

Answer 3

• DNA strand = backbone of alternating phosphate and deoxyribose molecules
• held trigger by covalent bond
• Arranged as: phosphate - oxygen - carbon
• each nucleotide attached to other by hydrogen bond