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Short Lessons

Big topics in small pieces.

Each lesson focuses on one idea, so you can get it before moving on. They're made to help you learn, not just read.

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Active transport

Diffusion moves molecules downhill, from where there are many to where there are few. Sometimes a cell needs the opposite, so it spends energy to pump them uphill.

Key Point

Active transport moves molecules against their gradient, and it costs the cell ATP.

Question 1Multiple Choice

Which process moves molecules against their concentration gradient?

ASimple diffusion
BOsmosis
CActive transport
DFacilitated diffusion

100%

0 of 1 answered

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Active transport

Diffusion moves molecules downhill, from where there are many to where there are few. Sometimes a cell needs the opposite, so it spends energy to pump them uphill.

Key Point

Active transport moves molecules against their gradient, and it costs the cell ATP.

Question 1Multiple Choice

Which process moves molecules against their concentration gradient?

ASimple diffusion
BOsmosis
CActive transport
DFacilitated diffusion

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Vesicles and bulk transport

Large molecules are too big to cross the membrane through a pump, so the cell moves them another way.

EndocytosisAsk AI Tutor folds the membrane around a particle and pulls it inside the cell.

Key Point

Endocytosis brings large particles in. Exocytosis sends them out. Both use energy.

Exocytosis works the other way round: a vesicle joins the membrane and releases what it carries outside the cell.

100%

0 of 1 answered

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Active transport

Diffusion moves molecules downhill, from where there are many to where there are few. Sometimes a cell needs the opposite, so it spends energy to pump them uphill.

Key Point

Active transport moves molecules against their gradient, and it costs the cell ATP.

Question 1Multiple Choice

Which process moves molecules against their concentration gradient?

ASimple diffusion
BOsmosis
CActive transport
DFacilitated diffusion

100%

0 of 1 answered

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