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Biology Chapter on Passive Transport

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@SpotlessFarce

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Questions and Answers

What is the primary characteristic of passive transport?

It occurs without any energy investment. (correct)

It involves movement against a concentration gradient.

It requires energy to move substances.

It is limited to only small molecules.

During diffusion, what determines the direction of molecular movement?

The molecular weight of the substances.

The size of the molecules only.

The concentration gradient of the substances. (correct)

The temperature of the surroundings.

What occurs when a system reaches dynamic equilibrium?

There is no movement of molecules across the membrane.

Molecules cross the membrane at the same rate in both directions. (correct)

Molecules move at different rates in each direction.

The concentration gradient becomes steep.

Which of the following best describes diffusion?

<p>The spontaneous tendency of molecules to spread out evenly in a space.</p> Signup and view all the answers

Which statement about high concentration to low concentration is true?

<p>It describes the natural direction of diffusion in passive transport.</p> Signup and view all the answers

Study Notes

Passive Transport

Involves the movement of substances across a membrane without using energy.
Facilitates the diffusion of molecules from areas of high concentration to areas of low concentration.

Diffusion

Describes the natural tendency for molecules to evenly distribute themselves within a space.
Molecules engage in random motion, but a population of molecules may exhibit a directional movement over time.
Importantly leads to a dynamic equilibrium, where the rate of molecules crossing the membrane in both directions becomes equal.

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Description

Explore the concepts of passive transport and diffusion in biological membranes. This quiz focuses on the movement of substances across cell membranes without energy investment, highlighting key principles such as concentration gradients and dynamic equilibrium.