Question

You are investigating the membrane properties of a newly discoverd deep sea bacterium. You discover that it is composed of 71 % protein (with the remainder being made up of a variety of lipid molecules). Calculate the overage density of the membrane assuming that protein has an average density of 1.2 g/ml and lipid a density of 0.94 g/ml. Question 14 Not yet answered Marked out of 10.0 Give your answer to one decimal place. P Flag question Answer: Question 15 A sample of cellulose has an average RMM of 350,000. Calculate the number of glucose residues per molecule of cellulose. Assume that RMM glucose (in cellulose) 162. Give your answer to the nearest whole number. The units in this case are residues/molecule, as the computer can only store shortened versions of units. You might wish to have a more descriptive unit if you were to write this down. Not yet answered Marked out of 10.0 P Flag question Answer:

Answer 1

1. 71%* 1.2g/mol = 85.2g/mol

29%*0.94g/mol =27.26 g/mol

Average membrane density = 85.2 +27.26 = 112.46g/mol

2. Average RMM of cellulose =350,000

RMM of one glucose molecule = 162

162*X = 350,000

X = 2160

Where X is the number of glucose molecules in cellulose