DNA is a biological polymer made up of repeating monomer units.
Identify the three chemical groups that must covalently bond to form a single DNA nucleotide monomer.
In a double-stranded B-form DNA molecule, the longitudinal length of the helix increases by 0.34 nm0.34\text{ nm}0.34 nm for every nucleotide pair (base pair).
A single somatic cell from a newly discovered desert rodent, Dipodomus deserti, is found to contain a total of 8.2 × 109 nucleotides within its nuclear genome.
Calculate the total physical length of the double-stranded DNA in this rodent cell. Give your answer in metres to an appropriate number of 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.