Active transport is the movement of materials from a high concentration to a low

Question

Active transport is the movement of materials from a high concentration to a low concentration, requiring the use of energy from the dephosphorylation of ATP molecules.

True

False

1 points   

QUESTION 2

How is a lipid different from a carbohydrate?

Lipids are nonpolar.

Lipids dissolve in water.

A lipid is only made up of hydrocarbons.

Lipids store genetic information.

1 points   

QUESTION 3

If you place a cell that has a 1.0M solution of glucose in a beaker of 10.0M glucose, the cell

will gain water across its membrane, creating a hypotonic cell.

will lose water across its membrane, creating a hypotonic cell.

will take in water across its membrane, creating a hypertonic cell.

will lose water across its membrane, creating a hypertonic cell.

1 points   

QUESTION 4

Osmosis is a type of diffusion.

True

False

1 points   

QUESTION 5

Phospholipids require the presence of a nucleic acid to spontaneously form a phospholipid bilayer.

True

False

1 points   

QUESTION 6

Place a check by ALL of the cellular transport mechanisms that could possibly move an object across a cell membrane that is too large to pass freely across the phospholipid bilayer.

pinocytosis

facilitated diffusion

cotransport

diffusion

exocytosis

osmosis

2 points   

QUESTION 7

The hydrophilic portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group.

True

False

1 points   

QUESTION 8

Vegetable oil is liquid at room temperature due to the presence of one or more double bonds in the fatty acid chain.

True

False

1 points   

QUESTION 9

Which of the following is a function of cellular membranes proteins?

They allow passage of select molecules that could not otherwise cross the lipid bilayer.

They dissolve the lipids in the membrane.

They provide a structure on which the membrane lipids can assemble a bilayer.

They form one side of the cellular membrane bilayer.

Lipids are nonpolar.

Lipids dissolve in water.

A lipid is only made up of hydrocarbons.

Lipids store genetic information.

Explanation / Answer

Answer 1. False

Active transport utilises energy but goes from low to high concentration.

Answer 2. Lipids are non polar

While carbohydrates are polar molecules, they also serve as important markers for the cell.

Answer 3. Will loose water across the membrane creating a hypertonic cell.

Because the cell has low solute and high solvent concentration whereas, the solution has high solute and low solvent concentration. Thus, movement will occur from cell to solution i. e. From high solvent to low solvent concentration. As a result of Exosmosis, the cell will loose solvent.

Answer 4. True

Osmosis is a type of diffusion but it allows movement of only solvent molecules, solids and gases are not involved in osmosis.

Answer 5. False

The case isn't so, because in the plasma membrane phospholipids are present without being interacting with the genetic material.

Answer 6. Cotransport and the facilitated diffusion.

They both involves the use of carrier proteins that help in moving the large molecules across the cell. Cotransport can be antitransport or symport.

Answer 7. True

These heads are water loving and thus present towards outside whereas the hydrophobic tails are present towards inside.

Answer 8. True

Unsaturated fatty acids or vegetable oils are liquid at room temperature because of their double or triple bonds. Saturated contain single bond thus they are solid at room temperature.

Answer 9. They aloow passage of selected molecules that otherwise cannot cross the Lipid bilayer.

These proteins act as carrier proteins and help in facilitated diffusion which involves movement of large molecules.

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