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1. An alien has just crash landed in your backyard. Being the inquisitive biology student that you are, the first
thing you do is take a tissue sample (its ok he/she's dead and won't mind) so that you can determine the
osmolarity of the alien's cells. After incubating pieces of the tissue in solutions containing various
concentrations of sucrose for 1 hour you get the results depicted in the table below. Based on these
results you could conclude that...
a. The alien tissue contains no osmotically active substances
b. The alien tissue is isotonic with the solution containing 0.1 M sucrose
c. The alien tissue is hypertonic compared to the 0.6 M sucrose solution
d. The alien tissue is hypotonic compared to the 0.6 M sucrose solution
e. None of the above
Approximate time in solution _1 hour_
Sucrose Molarity
0.0
0.1
0.2
0.3
0.4
0.5
0.6
Final weight
2.4g
2.2g
2.2 g
2.0 g
1.8 g
1.7g
1.4g
Initial weight
1.2g
1.3 g
1.2 g
1.1g
1.1g
1.3 g
1.1g
Weight change
1.2g
0.9 g
1.0 g
0.9 9
0.7g
0.4g
0.39
% weight change
100
69
83
81
64
31
27

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