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1. Predict what you would observe for the mixture of fatty acylchains of membrane

phospholipid present in bacteria first incubated at 37

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Sixta Kovacek
Sixta KovacekLv2
28 Sep 2019

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Related questions

The table below shows the percent of each type of phospholipid fatty acid tail found in each type of the grass membranes on Oct. 2 and Dec. 8th. The first column in the table shows the length of the fatty acid tail and the number of double-bonds in the fatty acid. For example the fatty acid “16:0” would be a fatty acid that was 16 carbons long and had 0 double-bonds. The second and third columns show the percent of all phospholipid fatty acids that were of this type. For example, in grass collected on October 2nd, 23.9 % of the phospholipid fatty acids were 16 carbons long and had no double-bonds (16:0 type), and in the grass collected on Dec. 8th, 21.0 % of the phospholipid fatty acids were 16 carbons long and had no double-bonds (16:0 type).

Fatty Acid composition

of Phospholipids

October 2

December 8

% of phospholipids

% of phospholipids

16:0

23.9

21.0

16.1

0.4

0.7

18:0

0.8

0.4

18:1

9.6

6.1

18:2

34.4

38.6

18:3

30.2

32.4

20:0

0.7

0.7

A. For each date the grass was collected, calculate the total percent of phospholipid fatty acids that were saturated fatty acids and the total percent of phospholipid fatty acids that were unsaturated fatty acids.

B. Draw a column graph that shows the total percent of phospholipid fatty acids that were saturated for each date that grass was collected and the total percent of phospholipids that were unsaturated for each date that grass were collected.

C. Why are the % of saturated and unsaturated fatty acid tails on the phospholipids of the Oct 2nd collected grass and the Dec 8th collected grass not the same? Use your understanding of membrane fluidity to address why these percentages have changed during this time period.

D. During this experiment the concentration of cholesterol found in the membranes of the grass was also measured. On Oct. 2th the concentration of cholesterol was 1.10 umol/mg and on Dec. 8th the concentration of cholesterol was 1.22 umol/mg. Why did the concentration of cholesterol change? Use your understanding of membrane fluidity to address why these concentrations have changed during this time period.

Most animal fats are solid at room temperature whereas plant and fish oils tend to be liquid. Both contain fatty acids.

1. Predict which type of lipid contains saturated fatty acids, and which type contains more unsaturated fatty acids. Explain your reasoning.

2. Predict which type(s) of fatty acids would be present in a cell’s plasma membrane. Explain your reasoning.

Most animal fats are solid at room temperature whereas plant and fish oils tend to be liquid. Both contain fatty acids. a. Predict which type of lipid contains saturated fatty acids, and which type contains more unsaturated fatty acids. Explain your reasoning. b. Predict which type(s) of fatty acids would be present in a cell’s plasma membrane. Explain your reasoning.

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