Question

1

Which is true of osmosis?

Group of answer choices

it moves with a water concentration gradient

it is the movement of oxygen across a membrane

it requires a source of energy such as ATP

it is a type of active transport

2

Movement in a membrane that is from one leaflet into the other leaflet, requiring flippase

Group of answer choices

Rotational

Transverse

Lateral

3

Which technique uses a mobile phase to transport molecules up an immobile phase support based upon polarity

Group of answer choices

TLC

Photobleaching

Cell Fusion

SDS-PAGE

4

Which technique uses antibodies to bind to proteins

Group of answer choices

Photobleaching

TLC

SDS-PAGE

Cell Fusion

5

Which technique indicates the movement of proteins within a membrane

Group of answer choices

Photobleaching

Cell Fusion

TLC

SDS-PAGE

6

Uses a laser to decolorize fluorescent dye

Group of answer choices

Photobleaching

TLC

SDS-PAGE

Cell Fusion

Answer 1

1)The osmosis is the movement of the water molecules from their high concentration to their low concentration through a semipermeable membrane.This process does not require ATP and is a passive process.So the right answer is it moves with a water concentration gradient ie from high water potential to a low water potential.

2)Transverse movement of the lipids from one leaflet to the other is through flippases.The transverse movement of lipids is a rare event because the polar head group will have to interact with the hyrophobic region. Therefore the plasma membrane is asymmetrical which contains different lipids on the either side of the leaflets.So the right answer is transverse.

3)The silica is the immobile phase and the solvent is the mobile phase containing hexane or any other organic solvent.The mixture of substances that need to be separated (plant pigment) is placed as a dot on the immobile phase and then dipped in the mobile phase such that the pigment just touches the mobile phase.Then the mixture of substances is made to run on the immobile phase through capillary action. If pigment  has more affinity for immobile phase then it will continue to move slowly compared to those having less affinity which will move fastly.So the right asnwer is TLC.

Please ask the other question separately.

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