A section of a gene in an algal cell codes for a chain of 24 amino acids. Each group of three bases on one DNA strand codes for one amino acid. The DNA has two strands.
Which pair gives the total number of nucleotide units and the total number of phosphate groups in this section of DNA?
144 nucleotide units and 288 phosphate groups.
144 nucleotide units and 144 phosphate groups.
72 nucleotide units and 144 phosphate groups.
72 nucleotide units and 72 phosphate groups.
62 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.