1. Cholesterol is an amphipathic molecule.

a.) True

b.) False

2. An unsaturated fatty acid has no double bonds in its fatty acid tail.

a.) True

c.) False

3. An amino acid such as F would most likely be found in the interior of proteins that are soluble in a hydrophobic environment.

a.) True

b.) False

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Lelia LubowitzLv2

28 Sep 2019

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Related questions

Proteins with only the amino acids D, E, K, and R on their surface can be found exclusively in the interior of a lipid bilayer.

a.) True

b.) False

An amino acid such as F would most likely be found in the interior of proteins that are soluble in a hydrophobic environment.

a.) True

b.) False

scarletplatypus922

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 â16:0â 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. 8^th, 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
Fatty Acid composition of Phospholipids	% 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 2^nd collected grass and the Dec 8^th 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. 2^th the concentration of cholesterol was 1.10 umol/mg and on Dec. 8^th 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.

1)The transition temperature, Tm, of a sample cell's membrane was found to be much lower than a reference cell's membrane. What can be said about the membrane contents of each based on this experiment?

The reference cell likely has a higher cis-fatty acid content than the sample cell.

The reference cell likely has a higher saturated fatty acid content than the sample cell.

The reference cell likely has a higher polyunsaturated fatty acid content than the sample cell.

The reference cell likely contains lower amounts of cholesterol than the sample cell.

2)How many of the following statements about DNA are true?

A-DNA and B-DNA form left-handed helices.

G and C nucleotides base pair with two hydrogen bonds.

The phosphodiester bonds that link adjacent nucleotides join the 3âhydroxyl of one nucleotide to the 5â of the next.

The two strands run in a parallel fashion.

All monosaccharide units lack an âOH at C-2â