Exploring Passive Transport Mechanisms in Cell Membranes

What does passive movement across the cell membrane mean?

• It does not require energy.

• It involves active transport.

• It requires energy.

• It only occurs in plant cells.

Why is homeostasis important for cells?

• It helps cells to grow faster.

• It enables cells to move freely.

• It helps cells to produce more energy.

• It allows cells to maintain stable internal conditions.

What is diffusion?

• Movement of molecules from low to high concentration.

• Movement of molecules from high to low concentration.

• Movement of water across a membrane.

• Movement of large molecules through a protein channel.

Which of the following is an example of diffusion?

• Salt dissolving in water.

• Sugar moving through a protein channel.

• Oxygen moving from blood to cells.

• Water moving through a membrane.

What types of molecules can diffuse across the cell membrane?

• Small non-polar gases like oxygen and carbon dioxide.

• Large hydrophilic molecules.

• Large polar molecules.

• Proteins and amino acids.

What is facilitated diffusion?

• Movement of small non-polar gases.

• Movement of larger molecules through a protein channel from high to low concentration.

• Movement of molecules from low to high concentration.

• Movement of water across a membrane.

What role do channel proteins play in facilitated diffusion?

• They create a tunnel for larger molecules to pass through the membrane.

• They provide energy for transport.

• They transport small non-polar gases.

• They move water across the membrane.

What is a solution?

• A solid substance dissolved in water.

• A mixture of two or more substances that are not dissolved.

• A mixture of two or more substances that are completely dissolved.

• A single substance in liquid form.

In osmosis, water moves from an area of _____ concentration to an area of _____ concentration.

• low solute, high solute

• high water, low water

• high solute, low solute

• low water, high water

Why does salt make you thirsty?

• Salt helps water move into your cells.

• Salt decreases the concentration of solute in your cells.

• Salt draws water out of your cells.

• Salt increases the energy in your cells.