Types of Transport

Other particles consumed by deer mice, such as calcium, have to move into the cells by active transport. Which diagram correctly shows the movement of particles into the cells by active transport?

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When glucose is broken down, carbon dioxide is produced, which results in more carbon dioxide inside the cell than outside the cell. The carbon dioxide then diffuses out of the cell.

Which statement best describes the movement of carbon dioxide by diffusion?

• The carbon dioxide can move through the plasma membrane by moving down the concentration gradient.

• Water molecules are needed to move the carbon dioxide across the plasma membrane.

• Peripheral proteins help move the carbon dioxide across the plasma membrane.

• The transport of carbon dioxide through the plasma membrane require energy from ATP.

Answer explanation

The correct choice states that carbon dioxide moves through the plasma membrane by diffusing down its concentration gradient, which is a passive process requiring no energy, unlike the other options.

Tags

NGSS.HS-LS1-7

Select the 3 types of passive transport

• Endocytosis

• Simple Diffusion

• Exocytosis

• Osmosis

• Facilitated diffusion

Answer explanation

The correct types of passive transport are Simple Diffusion, Osmosis, and Facilitated Diffusion. These processes allow substances to move across cell membranes without energy, unlike Endocytosis and Exocytosis, which require energy.

This type of transport does not require energy and moves down the concentration gradient from a high concentration to a low concentration.

• Active transport

• Passive transport

Answer explanation

Passive transport is the process that moves substances across cell membranes without the use of energy, following the concentration gradient from high to low concentration, making it the correct choice.

This type of transport requires energy (ATP) and moves against the concentration gradient moving from a low concentration to a high concentration.

• Active transport

• Passive transport

Answer explanation

Active transport requires energy (ATP) to move substances against their concentration gradient, from low to high concentration, unlike passive transport which occurs without energy and moves from high to low concentration.

This type of transport moves from high concentration to low concentration and passes directly through the membrane.

• Facilitated diffusion

• Simple diffusion

• Endocystosis

• Active transport

Answer explanation

Simple diffusion is the process where substances move from an area of high concentration to an area of low concentration directly through the membrane, without the need for energy or transport proteins.

This is the transfer of water across a membrane from an area of high concentration to an area of low concentration.

• Simple diffusion

• Facilitated diffusion

• Osmosis

• Active transport

Answer explanation

Osmosis is the specific process of water moving across a membrane from an area of high water concentration to an area of low water concentration, distinguishing it from other forms of transport like simple diffusion or active transport.

What type of tonicity is this? What way does the water move?

• Hypotonic, the water moves into the cell causing the cell to swell

• Isotonic, there is no net movement the cell stays the same

• Hypertonic, the water moves out of the cell causing the cell to shrink

Answer explanation

In an isotonic solution, the concentration of solutes is equal inside and outside the cell, resulting in no net movement of water. Therefore, the cell remains the same size.

The black dots represent the solute (salt or sugar). What is the tonicity of this solution? Which way will the water move?

• Hypotonic, the water will move into the cell causing the cell to swell

• Isotonic, there is no net movement of water the cell will stay the same

• Hypertonic, the water will move out of the cell causing the cell to shrink

Answer explanation

The solution is hypertonic because it has a higher concentration of solute (black dots) compared to the inside of the cell. Therefore, water will move out of the cell, causing it to shrink.

Tags

NGSS.HS-LS1-3

The black dots represent the solute (salt or sugar). What is the tonicity of the solution? Which way will the water move?

• Hypotonic, the water will move into the cell causing the cell to swell

• Isotonic, there is no net movement the cell will stay the same

• Hypertonic, the water will move out of the cell causing the cell to shrink

Answer explanation

The solution is hypotonic because it has a lower concentration of solute compared to the inside of the cell. Therefore, water will move into the cell, causing it to swell.