# A Quiz On Simple Diffusion

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Do you know about the term simple diffusion? Take this quiz on simple diffusion to test your knowledge of the topic. Diffusion is basically the random movement of molecules in a gas or a liquid, causing the molecules to become evenly distributed in the environment. If you know everything related to it or you wish to learn more, take this quiz. All the best! You can ace the quiz with a perfect score and all the correct answers. Do share the quiz.

• 1.

### Simple diffusion is defined as the movement of

• A.

Molecules from areas of higher concentration to areas of lower concentration.

• B.

Molecules from areas of lower concentration to areas of higher concentration.

• C.

Water molecules across a membrane

• D.

Gas molecules across a membrane.

A. Molecules from areas of higher concentration to areas of lower concentration.
Explanation
Simple diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration. This process occurs without the need for energy input and is driven by the concentration gradient. In simple diffusion, molecules move freely across a membrane, spreading out and equalizing their concentration. Therefore, the correct answer is "molecules from areas of higher concentration to areas of lower concentration."

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• 2.

### When sugar is mixed with water, equilibrium is reached when

• A.

Molecules of sugar stop moving.

• B.

Water and sugar molecules are moving at the same speed.

• C.

The dissolved sugar molecules are evenly distributed throughout the solution.

• D.

There are the same number of water molecules as dissolved sugar molecules.

C. The dissolved sugar molecules are evenly distributed throughout the solution.
Explanation
When sugar is mixed with water, it dissolves and forms a homogeneous mixture. This means that the sugar molecules are evenly distributed throughout the solution. Equilibrium is reached when the rate of dissolution of sugar is equal to the rate of precipitation of sugar, resulting in a balanced concentration of dissolved sugar molecules in the solution. Therefore, the correct answer is that the dissolved sugar molecules are evenly distributed throughout the solution.

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• 3.

### The rate of diffusion is affected by which of the following?

• A.

Temperature

• B.

Size of molecules

• C.

• D.

A and B

• E.

A, B and C

E. A, B and C
Explanation
The rate of diffusion is affected by temperature because as temperature increases, the kinetic energy of the molecules also increases, leading to faster movement and higher diffusion rates. The size of molecules also affects diffusion as smaller molecules can move more easily through gaps and pores, resulting in faster diffusion. The steepness of the concentration gradient also plays a role as a steeper gradient means a larger difference in concentration, which leads to faster diffusion. Therefore, all three factors - temperature, size of molecules, and steepness of the concentration gradient - affect the rate of diffusion.

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• 4.

### The molecules in a solid lump of sugar do not move.

• A.

True

• B.

False

B. False
Explanation
In a solid lump of sugar, the molecules do not stay still, but they do vibrate in place. This is because the molecules are held together by intermolecular forces, which give the sugar its solid form. While the molecules do not move freely like in a liquid or gas, they still have some motion, albeit limited to vibrating in their fixed positions. Therefore, the statement that the molecules in a solid lump of sugar do not move is false.

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• 5.

### Diffusion is one of the processes whereby materials are exchanged between a cell and its environment.

• A.

True

• B.

False

A. True
Explanation
Diffusion is indeed one of the processes by which materials are exchanged between a cell and its environment. Diffusion occurs when molecules move from an area of high concentration to an area of low concentration, allowing for the exchange of essential substances such as oxygen, carbon dioxide, and nutrients across the cell membrane. This process is crucial for maintaining homeostasis and ensuring the proper functioning of cells. Therefore, the statement "Diffusion is one of the processes whereby materials are exchanged between a cell and its environment" is true.

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• 6.

### When there is an unequal concentration of something, it will create a

• A.

• B.

Equilibrium

• C.

An unequal diffusion

• D.

Sedimentation

Explanation
When there is an unequal concentration of something, it will create a concentration gradient. This means that there is a difference in the amount or concentration of a substance between two areas. Substances tend to move from areas of high concentration to areas of low concentration in order to reach equilibrium. The concentration gradient is what drives this movement, as substances try to balance out the concentration on both sides. Therefore, the correct answer is concentration gradient.

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• 7.

### Simple Diffusion is a type of Active Transport.

• A.

True

• B.

False

B. False
Explanation
Simple diffusion is actually a type of passive transport, not active transport. In simple diffusion, molecules move from an area of higher concentration to an area of lower concentration without the need for energy input. Active transport, on the other hand, requires the use of energy to move molecules against their concentration gradient. Therefore, the statement that simple diffusion is a type of active transport is incorrect.

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• 8.

### Simple Diffusion is able to use the concentration gradient for moving SMALL NON-POLAR molecules across the plasma membrane.

• A.

True

• B.

False

A. True
Explanation
Simple diffusion is a passive process that allows small non-polar molecules to move across the plasma membrane. It takes advantage of the concentration gradient, which is the difference in concentration between the inside and outside of the cell. Small non-polar molecules are able to move freely through the lipid bilayer of the membrane without the need for any energy input or assistance from transport proteins. Therefore, the statement that simple diffusion can use the concentration gradient to move small non-polar molecules across the plasma membrane is true.

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• 9.

### Which Biomolecule product helps to allows Simple Diffusion to happen?

• A.

Saturated Fatty Acids

• B.

Cellulose

• C.

Protein

• D.

Cholesterol

D. Cholesterol
Explanation
Cholesterol is the correct answer because it is a lipid molecule that is an essential component of cell membranes. It helps to maintain the fluidity and stability of the cell membrane, allowing for simple diffusion to occur. Simple diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration, and cholesterol plays a crucial role in facilitating this process.

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• 10.

### Which Biomolecule has an Amino Acid as a monomer?

• A.

Carbohydrates

• B.

Proteins

• C.

Lipids

• D.

Nucleic Acid

B. Proteins
Explanation
Proteins are biomolecules that have amino acids as their monomers. Amino acids are the building blocks of proteins and are linked together through peptide bonds to form long chains called polypeptides. These polypeptides then fold into complex three-dimensional structures to create functional proteins. Therefore, proteins are the correct answer to the question.

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