7.5.3-Moving Cellular Material

Passive Transport

Equilibrium

Molecules are equally spread out

Cell Membrane Structure

●Phospholipid bilayer

○Hydrophilic heads

○Hydrophobic tails

●Carbohydrates- ID tags, adhere cell to other cells

●Proteins- transport materials, act as enzymes to speed up reactions, or receptors

●Cholesterol- strength,
temperature regulation

●Selectively permeable- it allows
some but not all materials to
cross

○Maintains cell’s homeostasis

Multiple Choice

Marinating stable internal conditions is called ?

• Lipids

• Eukaryote

• Homeostasis

• polarity

Diffusion

Movement of molecules from high concentration to low concentration.

Stops when equilibrium is reached

Poll

Have you smelled food cooking that was across the room? (like burnt popcorn in the microwave)

• Yes

• No

Multiple Choice

How do molecules move during diffusion?

• From high concentration to low concentration

• From low concentration to high concentration

Equilibrium

Molecules are equally spread out

Multiple Choice

What is the goal of diffusion called when molecules are equally spread out?

• Samenss

• Equilibrium

Passive Transport

• Movement of substance across plasma membrane WITHOUT any energy

Multiple Choice

Does passive transport require energy?

• Yes

• No

Simple Diffusion

Molecules move from high concentration to low concentration through a membrane

Multiple Choice

True or False: In simple diffusion, molecules move from high concentration to low concentration across a membrane.

• True

• False

Osmosis

●The movement of water across membrane from higher water concentration to lower water concentration

○Water also moves from area
of lower solute concentration
to higher solute concentration

Higher concentration of solutes= lower concentration of water

Osmosis

• Special type of diffusion

• Often involves movement of water into the cell OR out of cell

Definition of Osmosis

• The diffusion of only water molecules through a cell membrane

Multiple Select

Select TWO answers that describe OSMOSIS.

• Small molecules

• Large molecules

• Water molecules

• Molecules move between phospholipids

• Molecules need a protein channel

Osmosis

-Down concentration gradient

-Does not require energy

-Involves only the movement of water molecules

-Occurs through a selectively permeable membrane

Facilitated Diffusion

Molecules move from high to low concentration through a PROTEIN

Facilitated Diffusion

Does NOT require energy

Multiple Choice

Which type of diffusion uses a protein to help molecules get across?

• Simple diffusion

• Facilitated diffusion

Remember:

Diffusion is how molecules cross your cell membrane WITHOUT any energy

Multiple Select

Check for Understanding:

Movement of particles from high to low concentration.

• Passive Transport

• Active Transport

Multiple Select

True or False: Passive transport occurs when molecules move from an area of low concentration to high concentration.

• True

• False

Multiple Choice

The movement of water across a membrane moving with the concentration gradient is called ________.

• facilitated diffusion

• osmosis

• active transport

• None of the above

Multiple Select

In facilitated diffusion, a _____ is needed to help molecules move across the cell membrane.

• lipid

• amino acid

• carbohydrate

• protein

Multiple Choice

True or False:

In passive transport, no energy is needed in order for molecules to move across the membrane.

• True

• False

Multiple Select

Diffusion across a cell membrane works best with large, complex molecules.

• True

• False

Active transport

requires energy from ATP to cause the protein channel to an area of lower concentration to an area of higher concentration
(HIGH TO LOW)

Endocytosis:

• Cell shifts the cell membrane in order to bring substances INTO the cell

• transports a bulk of molecules or molecules that are too large into the cell

• Uses a lot of energy and is NOT always safe

Exocytosis

• Cells shift the cell membrane to get rid of substances from the cell

• Uses a lot of energy

• transports a bulk of molecules out of the cell

• Uses alot of energy ATP

Multiple Choice

Which is true about active transport?

• it moves material from low to high concentration

• it does not require energy

• it moves material from high to low concentration

Multiple Choice

Type of cell transport that uses ATP (energy)

• Passive Transport

• Active Transport

Multiple Choice

True or False? Endocytosis brings large things into the cell and exocytosis brings large things outside of the cell

• true

• false

Multiple Choice

Which of the following is NOT a type of passive transport?

• endocytosis

• diffusion

• osmosis

• facilitated diffusion

Multiple Choice

In passive transport, molecules move from an area of __________ concentration to an area of __________ concentraiton

• high, low
• low, high
• water, salt
• active, passive

Multiple Choice

Osmosis is the movement of _____ across a membrane.

• food
• energy
• oxygen
• water

Multiple Choice

Passive transport requires no

• concentration gradients
• osmosis
• motion
• energy

Multiple Choice

What is diffusion?

• when molecules move 
• when molecules move from a high concentration to a low.
• no movement 
• molecules move everywhere

Multiple Choice

Which type of transport requires an input of energy?

• Passive Transport
• Osmosis
• Simple Diffusion
• Active Transport

Multiple Choice

The diffusion of water across a membrane is called

• equilibrium.
• osmosis.
• facilitated diffusion.
• active transport.

Multiple Choice

Someone sprays air freshener.  The scent fills the room.  This is an example of

• active transport
• osmosis
• diffusion
• cellular respiration

Multiple Choice

Which transport does not require energy?

• Passive
• Active 

Multiple Choice

Which of the following is a job of the cell membrane?

• Regulates which materials enter and leave the cell.
• Breaks apart lipids, carbohydrates, and proteins from foods.
• Stores water, salt, proteins, and carbohydrates.
• Keeps the cell wall in place.

Multiple Choice

Particles of dye, when placed in a beaker of water, eventually spread evenly throughout the water. This is an example of

• isotonic

• diffusion

• osmosis

• active transport

Multiple Choice

Movement of particles from high to low concentration. 

• Passive Transport
• Active Transport

Multiple Choice

Osmosis is a form of ______________. 

• Passive Transport
• Active Transport

Multiple Choice

Low to High

• Passive Transport
• Active Transport

Multiple Choice

ALL living cells have this in common

• Nucleus
• Cell Membrane
• Cell Wall
• Mitochondria

Multiple Choice

Controlling what goes into or out of the cell without energy is called

• active transport
• endocytosis
• passive transport
• exocytosis