DNA is a polynucleotide consisting of repeating monomer units called nucleotides.
Identify the three chemical components that covalently link together to form a single DNA nucleotide monomer.
In B-DNA, the distance along the helical axis increases by 0.34 nm0.34\text{ nm}0.34 nm for every complementary base pair. A diploid somatic cell of a certain mammalian species contains a total of 6.8×1096.8 \times 10^96.8×109 nucleotides in its genomic DNA.
Calculate the total length of the DNA double helix in this mammalian cell. Give your answer in metres, rounded to 3 significant figures.
76 exam-style questions on AQA GCSE Biology 6.1 Reproduction, covering 6.1.1 Sexual and asexual reproduction, 6.1.2 Meiosis, 6.1.3 Advantages and disadvantages of sexual and asexual reproduction, 6.1.4 DNA and the genome, 6.1.5 DNA structure, 6.1.6 Genetic inheritance, 6.1.7 Inherited disorders, and 6.1.8 Sex determination. Each one has a worked solution and a mark scheme showing where the marks go.