Active Transport

Active Transport

Tuesday 9th February 2021

Active Transport

• We have already looked at diffusion and osmosis.

• Active transport is another method in which cells can get nutrients from elsewhere.

• It is another process involving the movement of molecules.

Multiple Choice

What is diffusion?

• The movement of molecules from high to low concentration

• The movement of water molecules from high to low concentration across a partially permeable membrane

• The movement of molecules from low to high concentration

Multiple Choice

What is osmosis?

• The movement of molecules from high to low concentration

• The movement of water molecules from high to low concentration across a partially permeable membrane

• The movement of molecules from low to high concentration

Multiple Choice

TRUE OR FALSE? Osmosis is a type of diffusion

• TRUE

• FALSE

Active Transport

In the examples we looked at previously, substances are transported passively, down concentration gradients.

Sometimes, substances have to be moved from a low to a high concentration - against a concentration gradient.

Active transport is a process that is required to move molecules against a concentration gradient. This process does require energy.

Active Transport

Is the process by which molecules move from low to high concentration, using energy.

Multiple Choice

TRUE OR FALSE? Active Transport is a passive process.

• TRUE

• FALSE

Open Ended

What is the name of the process that mammals use in order to get enough energy for active transport?

Youtube Video

Root Hair Cell

For plants to take up mineral ions, ions are moved into root hair cells, where they are in a higher concentration than in the soil.

Active transport occurs within the root so that the plant takes in even more of the ions that it needs from the soil.

Multiple Choice

During active transport, molecules are moved from a region of _____ concentration to _____ concentration

• high, low

• low, high

Lumen of the Intestine

In animals, glucose molecules have to be moved across the gut wall into the blood. The glucose molecules in the intestine might be in a higher concentration than in the intestinal cells and blood – for instance, after a meal.

However, all of the glucose in the gut needs to be absorbed.

When the glucose concentration in the intestine is lower than in the intestinal cells, movement of glucose involves active transport. The process requires energy produced by respiration.

Multiple Choice

In mammals, which process is used to produce energy needed for active transport?

• photosynthesis

• breathing

• respiration

• homeostasis

Multiple Select

How confident do you feel with answering questions on active transport?

THERE IS NO RIGHT OR WRONG ANSWER! It is just to let me know how you feel with the topic :).

• Not great, I could do with some practice.

• I think I've got it, but some practice would help.

• I know what I'm doing and should be able to do the practice questions myself.