page 04 7. The surface area to volume ratio of a cell is an important factor affecting transport into cells. The surface area to volume ratio of an E. coli cell is 4·5. A eukaryotic cell has a surface area of 1809 μm2 and a volume of 7235 μm3. Compared to E. coli, the surface area to volume ratio of the eukaryotic cell is approximately A 1·1 times larger B 1·1 times smaller C 18 times larger D 18 times smaller. 8. Alpha helices in proteins are stabilised by A hydrogen bonds B ionic bonds C disulphide bridges D hydrophobic interactions. 9. Which row in the table describes the effects of an increase in temperature on haemoglobin and oxygen delivery to cells? Affinity of haemoglobin for oxygen Oxygen delivery to tissue A increase increase B increase decrease C decrease increase D decrease decrease