A microbiologist extracts the genomic DNA from two different cell samples: a bacterium (Escherichia coli) and a unicellular eukaryote (yeast, Saccharomyces cerevisiae), as shown in the diagram below.
Which of the following correctly describes the structural properties of the main genomic DNA in these cells?
E. coli genomic DNA is circular and not associated with histones, whereas yeast nuclear genomic DNA is linear and associated with histones.
E. coli genomic DNA is linear and associated with histones, whereas yeast nuclear genomic DNA is circular and not associated with histones.
E. coli genomic DNA is circular and associated with histones, whereas yeast nuclear genomic DNA is linear and not associated with histones.
E. coli genomic DNA is linear and not associated with histones, whereas yeast nuclear genomic DNA is circular and associated with histones.
Cell structures Questions
Practise OCR GCSE Biology Cell structures with exam-style questions for Foundation and Higher tier. 69 questions, matched to the OCR GCSE Biology (J247) specification and written in the written papers style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.