1./The paired bascs of a DNA moleculc are best described as a covalently linked across the width of the double helix . identical c. mirror images d complementary c. single-stranded 2. (two marks) The percentage composition of a nucleic acid molecule found in bacterial cells is 32.3% adenine 30.7% thymine 19.1% cytosine 17.9% guanine The molecule is most likely to be a double-stranded DNA b. mitochondrial DNA c. messenger RNA d double-stranded RNA c. single-stranded DNA Page 1 581401 Lesson Assignment 3. two marks, Which of the following is a correct representation of a segment of DNA? 4 'ATAG3 3TATCS S'ACGA3 3TGOTS 5. SATTC3 3'ATTCS S'AUUC3 3'UAAGS SCOGG3 SGGCC3 2. 3 d 4 and 5 Sand 1 1 b. 1 and 3 C 2 and 3 78% Paan