Cell Transport

Transport through the cell Membrane

The cell membrane is a selectively

permeable membrane- like a castle
wall it allows some things in but keeps
others out.

The cell membrane acts like a
fence...some small things can move
through freely, larger things need to be
brought in

Multiple Choice

What is NOT TRUE about the cell membrane

• It controls what enters and leaves the cell
• Semipermeable
• Phospholipid bilayer
• Contains digestive enzymes

Multiple Choice

It forms a boundary between the inside of the cell and the outside of the cell. 

• Cell Membrane
• Lipid Cleric Layer
• Membrane Gate
• Protein Receptors 

Multiple Choice

Something is ___________ ____________
when some molecules can cross the membrane while others cannot. 

• Selectively (or Semi) Permeable 
• Totally Transparent
• Liquid Licorice 
• Heavily Patrolled 

Transport through the cell Membrane
Transport without energy or Passive Transport:

Diffusion - tiny particles like oxygen can move through the gaps in
the cell membrane...the molecules generally move to spread out
evenly

Facilitated Diffusion - just like regular diffusion but molecules move
from high to low concentration by sliding through gap created by
proteins in the cell membrane

Diffusion

Key idea – The main way that small molecules

move across the cell membrane

Diffusion – is a type of passive transport process of molecules moving from an

area of high concentration to an area of lower concentration until they spread out evenly

Diffusion

What causes Diffusion?

- Diffusion is always

happening as molecules
push and bump against
each other in an effort to spread out evenly.

- Moves from high to Low concentration!!

Diffusion of Oxygen
Example: Oxygen in the blood is higher then in a

cell so the oxygen moves into the cell by
diffusing to an area of lower concentration, the
opposite happens as the blood circulates back to the lungs.

Multiple Choice

Diffusion & Facilitated Diffusion are both __________ transport.

• Passive

• Active

• Easy

• Free

Multiple Choice

Passive Transport is the movement of particles across the membrane from an area of [ ___ ] to an area of [ ___ ]

• high to low

• low to high

• low to low

• high to high

Multiple Choice

Passive Transport uses ____ energy

• no

• a lot of

• a little bit of

• some

Multiple Choice

An example of diffusion is

• CO₂ and O₂ exchange in the lungs

• Glucose transport

• Na⁺ / K⁺ Pumps

• Exocytosis

Multiple Choice

What is the movement of particles with the concentration gradient using protein "helpers"?

• diffusion

• facilitated diffusion

• active transport

• enzymatic reactions

Multiple Choice

An example of facilitated diffusion is

• CO₂ and O₂ exchange in the lungs

• Glucose transport

• Na⁺ / K⁺ Pumps

• Endocytosis

Multiple Choice

Facilitated diffusion needs what to get particles from one side of the membrane to the other?

• a membrane-spanning protein

• a surface protein

• a phospholipid

• a carbohydrate

Osmosis

Osmosis - The diffusion of water across

a selectively permeable membrane

Key Idea – because cells cannot function

properly without adequate water, many cellular process depend on osmosis

Osmosis

Osmosis and Diffusion

- water spreading from high concentration
to low concentration

Effects of Osmosis
- Effects the size of
cells based on available
water

Multiple Choice

Osmosis is the movement of _____ across a membrane.

• food
• energy
• oxygen
• water

Multiple Choice

During osmosis

• water moves from high to low concentration
• large or oddly shaped molecules move across a cell membrane
• water moves when energy is used
• proteins are built

Active transport

Passive transport – movement of molecules

that does not require energy

Active transport – movement across the cell

membrane that requires energy

4.

Transport through the cell Membrane Transport Using Energy:

Active transport or moving things into the cell that requires energy
with protein is on method of getting resources into the cell...this
occurs when moving things from a low concentration to a high (like moving things uphill)

Two other types of energy required transport are: endocytosis
(moving large particles into the cell) and ectocytosis (moving large particles out of the cell)

Multiple Choice

Which type of transport requires an input of energy?

• Passive Transport
• Osmosis
• Simple Diffusion
• Active Transport

Multiple Choice

Which form of active transport is being shown?

• Facilitated Diffusion
• Exocytosis
• Endocytosis
• Protein Pumps

Multiple Choice

Which is NOT a form of active transport?

• Endocytosis
• Osmosis
• Exocytosis
• Pinocytosis

Multiple Choice

Which form of active transport is being shown?

• Pinocytosis
• Endocytosis
• Exocytosis
• Osmosis

Prokaryotes

The prokaryotes are a group of organisms that lack a

cell nucleus or any other membrane-bound
organelles. There are 2 groups Archaea and Bacteria.

Eukaryotes

The presence of a nucleus defines eukaryotes. All species

of large complex organisms are eukaryotes, including animals, plants and fungi, although most species of eukaryote are protist microorganisms.

Multiple Choice

What type of cell has a nucleus?

• eukaryotic

• prokaryotic

• neither

• both

Multiple Choice

Plants and animal cells are examples of ___ cells

• prokaryotic cells

• eukaryotic cells

• both eukaryotic and prokaryotic

• neither

Multiple Choice

Prokaryotes do NOT have....

• membrane bound organelles

• DNA or RNA

• Cell membrane

• Life

Multiple Choice

Bacteria are considered what?

• Eukaryotes

• Prokaryotes

Multiple Choice

This is a picture of:

• Prokaryote
• Eukaryote

Multiple Choice

Which type of cell?

• Prokaryote
• Eukaryote

Multiple Choice

Which type of cell?

• Prokaryote
• Eukaryote