Active Transport

Active transport moves molecules across the cell membrane from ______ to ______ concentration.

• High to low

• Low to high

• It depends on the situation

Active transport moves substances across the cell membrane _______ the concentration gradient.

• With

• Against

• Down

• Over

Active transport requires special proteins called _______.

• Enzymes

• Channels

• Pumps

• Antibodies

Active transport requires energy in the form of a molecule called _______.

• RTI

• RNA

• DNA

• ATP

Active transport requires energy from the cell.

• True

• False

One example of active transport that allows nerve cells to send messages is the ______ pump.

• Carbon-hydrogen

• Potassium- phosphorus

• Sodium-potassium

• Fluoride-chloride

Active transport often moves small charged atoms called _______ across the cell membrane.

• Protons

• Neutrons

• Isotopes

• Ions

How does active transport differ from passive transport? Active transport:

• Includes facilitated diffusion

• Moves substances DOWN/WITH the concentration gradient

• Moves substances from LOW to HIGH concentration

• Only moves substances OUT of the cell