# What Do You Know About Passive Transport? Quiz

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The cell is the basic building block for human beings and that being said for any substance to move within the body, it has to pass through the cell membranes. Have you just finished chapter five of section one in biology class? Take up this test and get to see just how much you got to understand about passive transport. All the best!

• 1.

### Diffision is the simplest type of passive transport because its is the movement of molecules from an area of ________ to __________ concentration.

• A.

Lower to higher

• B.

Equal to equal

• C.

Lower to lower

• D.

Higher to lower

• E.

No where land

D. Higher to lower
Explanation
This is driven entirely by kinetic energy because molecules which are in constant motion bump go in random diretions and when the bump into each other the bounce off into another direction and if the do not bump into another object they will keep traveling in a straight path until they do therefore they move to less crowed of higher concentrated areas to lower concentration areas.

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• 2.

### In diffusion the molecules move _________ the concentration gradient.

• A.

Up

• B.

Across

• C.

Over

• D.

Down

• E.

Under

D. Down
Explanation
In diffusion, molecules move down the concentration gradient. This means that they move from an area of higher concentration to an area of lower concentration. This movement occurs due to the random motion of molecules and does not require any external energy input. Therefore, the correct answer is "down".

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• 3.

### In the absence of other influences, diffusion will eventually cause the molecules to reach _______________, distributing the molecules evenly throughout the occupied space.

equilibrium
Explanation
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration until there is no longer a concentration gradient, leading to an equal distribution of molecules throughout the space. This state, where the concentration of molecules is the same everywhere, is known as equilibrium. It is a fundamental concept in chemistry and physics, illustrating how substances move and mix on a molecular level in the absence of external forces.

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• 4.

### Allowing certain molecules to diffuse across the membrane is...?

• A.

Diffuesion

• B.

Osmosis

• C.

Simple diffusion

• D.

Ionic

• E.

Who cares

C. Simple diffusion
Explanation
When the molecules diffuse across the membrane the diffuse from an area of high conecntration to an area of low concentration. ***Very small but not soluble in lipids.***

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• 5.

### Osmosis is...

• A.

The process where water diffuses through equal concentrations

• B.

The process where water diffuesed across the cells membrane from an area of lower to an area of higher concentration

• C.

Where water diffueses across the cell membrane from area of higher to lower concentration

• D.

The process where a solute diffuses into water through membranous sacks not using energy

• E.

...what

C. Where water diffueses across the cell membrane from area of higher to lower concentration
Explanation
Osmosis is the process by which water molecules move across a semipermeable membrane from an area of higher water concentration (dilute solution) to an area of lower water concentration (concentrated solution). This movement occurs in order to equalize the concentration of solutes on both sides of the membrane.

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• 6.

### When the concentration of solute molecules outside the cell is __________ then the concentration in the cytosol though solution is hypertonic.

higher, more, Higher, More
Explanation
The water diffuses out of the cell

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• 7.

### When the concentration inside and outside of the cell is equal the solutiom is _________ to the cytosol.

isotonic
Explanation
water diffuses in and out of the cell at equal rates

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• 8.

### Isotonic:regular shapehypotonic:bloatshypertonic:__________-

• A.

Nothing

• B.

Widens

• C.

Expand

• D.

Dies

• E.

Shrivel

E. Shrivel
Explanation
When a solution is hypertonic, it means that the concentration of solutes outside the cell is higher than inside the cell. This creates a concentration gradient, causing water to move out of the cell through osmosis. As a result, the cell loses water and starts to shrink or shrivel. Therefore, the correct answer is "shrivel."

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• 9.

### Most plant cells live in _________ environments.

• A.

Hypotonic

• B.

Hypertonic

• C.

Isotonic

• D.

Plasmolysis

• E.

W/e

A. Hypotonic
Explanation
Most plant cells live in hypotonic environments. In a hypotonic environment, the concentration of solutes outside the cell is lower than inside the cell. This causes water to move into the cell through osmosis, resulting in the cell becoming turgid or swollen. Plant cells are adapted to hypotonic environments because their cell walls prevent them from bursting when they take in excess water. This is important for the overall health and functioning of the plant.

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• 10.

### Some cells fill with water until cell membrane presses against cell wall. The pressure water molecules exert against the cell wall is... ____________?

• A.

Turgor pressure

• B.

W/e

• C.

Cell wall

• D.

Facilitated diffusion

• E.

Plasmolysis

A. Turgor pressure
Explanation
When cells fill with water, the pressure exerted by the water molecules against the cell wall is known as turgor pressure. This pressure is created when water enters the cell and pushes against the cell membrane, causing it to press against the rigid cell wall. Turgor pressure is important for maintaining the shape and rigidity of plant cells, as well as for supporting the overall structure of the plant.

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• 11.

### In hypertonic environment water leaves cell through osmosis and turgor pressure is lost which is called _________________.

• A.

Cytolysis

• B.

Plasmolysis

• C.

Turgor pressure

• D.

Hypertonic

• E.

Facilitated diffusion

B. Plasmolysis
Explanation
Plasmolysis is the correct answer because in a hypertonic environment, water leaves the cell through osmosis, causing the cell to shrink and lose turgor pressure. This process is known as plasmolysis.

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• 12.

### The bursting of a cell is ______.

cytolysis
Explanation
Cytolysis refers to the bursting or rupturing of a cell due to excessive osmotic pressure. When a cell is placed in a hypotonic solution, water enters the cell, causing it to swell. If the cell cannot regulate the influx of water and the pressure inside the cell becomes too high, the cell membrane may rupture, leading to cytolysis. This process is commonly observed in bacteria, red blood cells, and other types of cells.

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• 13.

### The process used when molecules can not be readily diffused through the cell membrane is _______________.

facilitated diffusion
Explanation
molecules may not be soluble in lipids or too large

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• 14.

### In facilitated diffusion the movment of these molecules is assisted by ---------------.

carrier proteins
Explanation
Facilitated diffusion is a type of passive transport in which molecules move across a cell membrane with the help of carrier proteins. These carrier proteins bind to specific molecules and assist in their movement across the membrane, allowing them to pass through more easily than they would through simple diffusion. Therefore, the correct answer is carrier proteins.

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• 15.

### Carrier proteins transport molecules from an area of ________ to _________ concentration from one to the other side of the cell membrane.

higher to lower
Explanation
Carrier proteins are integral membrane proteins that facilitate the movement of molecules across the cell membrane. In this case, they transport molecules from an area of higher concentration to an area of lower concentration. This process is known as passive transport or facilitated diffusion. It occurs down the concentration gradient, which means that molecules move from areas of higher concentration to areas of lower concentration. The carrier proteins bind to the molecules and undergo a conformational change, allowing them to transport the molecules across the cell membrane without the need for energy expenditure.

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• 16.

### When ________ transport ions from higher to lower concentrations they are a form of passive transport.

ion channels
Explanation
Ion channels are protein structures found in the cell membrane that allow the passage of specific ions, such as sodium, potassium, or calcium, across the membrane. They facilitate the movement of ions from areas of higher concentration to areas of lower concentration, which is known as passive transport. This process does not require the cell to expend energy and is driven by the concentration gradient of the ions. Therefore, ion channels transport ions in a passive manner, making them a form of passive transport.

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• 17.

### Because ions are not ______ __ __________ they can not diffuse across the phospholipid bilayer with out assistence.

• A.

Unsoluble in lipids

• B.

Active

• C.

Kinetic energy

• D.

Passive

• E.

Soleuble in lipids

E. Soleuble in lipids
Explanation
they provide small passageways and each type of channel is specific to one type of ion

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• 18.

### Some ion channels are always open but some have "________".

• A.

• B.

Gates

• C.

Bars

• D.

Crosses

• E.

Passages

B. Gates
Explanation
Some ion channels are always open but some have "gates" that can open or close. These gates act as a control mechanism, allowing the ion channel to regulate the flow of ions through it. When the gates are open, ions can pass through the channel, but when the gates are closed, the flow of ions is blocked. This gating mechanism allows ion channels to play a crucial role in various physiological processes, such as nerve signaling and muscle contraction.

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• Apr 04, 2024
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• Oct 28, 2008
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