QUESTION 1 An unsaturated site in a phospholipid will cause what is referred to

Question

QUESTION 1

An unsaturated site in a phospholipid will cause what is referred to in the fatty acid chain as a .

QUESTION 2

Fatty acids esterified to glycerol in the lipid bilayer having one or more unsaturated sites is less flexible than one with where all sltes are saturated.

True

False

QUESTION 3

The thickness of the membrane is .

QUESTION 4

In a phospholipid, the fatty acid chains are linked to the  by  bonds.

QUESTION 5

The hydrophilic head group is hydrophilic because it can  bond.

2 points   

QUESTION 6

The number of carbons in the esterified fatty acid tails is  and ranges between  and .

3 points   

QUESTION 7

Lipids can move freely in the plane of the membrane because they are covalently linked.

True

False

1 points   

QUESTION 8

Flip flopping between the inner leaflet and outer leaflet of the membrane is a frequent event

True

False

1 points   

QUESTION 9

Transmembrane Proteins:

can move laterally and flip 180 in the membrane.

cannot move laterally but can flip 180 in the membrane.

can move laterally and cannot flip  180 in the membrane.

are fixed in position in the membrane because of covalent bonds with lipids.

none of the above.

1 points   

QUESTION 10

The presence of 2 disulfide bonds near each other is a good thing when a stretch of protein is to be immobilized.

True

False

1 points   

QUESTION 11

From the following, where would a proline residue be least likely to be?

in the cytoplasm

in the membrane

outside the cell

in the middle of an alpha helix

at the end of an alpha helix

1 points   

QUESTION 12

Submembrane cytoskeletons can provide shape to a cell.

True

False

1 points   

QUESTION 13

Beta pleated sheets can provide a unique environment on one side of the sheet relative to the other side of the sheet because of the types of side groups that can accumulate there

True

False

1 points   

QUESTION 14

The empty center of a single pass transmembrane protein provides a channel for the transport of ions.

True

False

1 points   

QUESTION 15

Membrane anchors set up the geography of a cell.

True

False

1 points   

QUESTION 16

How many amino acids are required to span a typical membrane?

1 points   

QUESTION 17

Transmembrane proteins of alpha helices most frequently span the membrane  or  times.

2 points   

QUESTION 18

After homogenization, the first centrifugation pellets the .

1 points   

QUESTION 19

A sucrose gradient is used to purify  away from other .

2 points   

QUESTION 20

An organic precipitation works because the solvent, , disrupts  of the solute

2 points   

QUESTION 21

Homogenization buffer can be identical to an intracellular buffer.

True

False

1 points   

QUESTION 22

A salt wash of membranes is used to remove the cytoskeleton.

True

False

can move laterally and flip 180 in the membrane.

cannot move laterally but can flip 180 in the membrane.

can move laterally and cannot flip  180 in the membrane.

are fixed in position in the membrane because of covalent bonds with lipids.

none of the above.

Explanation / Answer

1) unsaturated site will cause bend in the phospholipds that is referred to in the fatty acid as a KINK. And thus makes phospholipd more liquid.

2) False. Because unsaturated sites make bend in the fatty acid chains and that make less proper packaging of fatty acid chain and thus making it more flexible and saturated fats fits properly and make the structure rigid.

3) The thickness of the membrane is around 7.5-10 nm with two layers of lipid molecules.

4) Fatty acid chains in the phospholipds are bound by ESTER bond with glycerol. It is formed between hydroxyl group of glycerol and carboxylic group of fatty acid chains

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