WG Cell Membrane & Transport Notes

​Cell Membrane & Transport

By Greta Faurote

Cell Membrane

Multiple Choice

Why is the cell membrane referred to as being fluid mosaic?

• The cell membrane is rigid and lacks diversity in its components.
• The cell membrane is static and does not change shape or composition.
• The cell membrane is a solid structure made only of proteins.
• The cell membrane is referred to as being fluid mosaic due to its flexible structure and diverse composition of lipids and proteins.

Multiple Choice

What molecule aids in cell fluidity and flexibility? 

• Cholesterol
• Phospholipid
• Triglyceride
• Sphingolipid

Multiple Choice

The cell membrane is selectively permeable, which means...

• The cell membrane allows all substances to pass freely.
• The cell membrane is impermeable to all materials.
• The cell membrane only permits water to enter the cell.
• The cell membrane controls the entry and exit of substances.

Multiple Choice

Which of the following is NOT part of the cell membrane?

• Carbohydrates

• Lipids

• Nucleic Acids

• Proteins

Multiple Select

Phospholipid tails are...

• Nonpolar

• Polar

• Hydrophilic

• Hydrophobic

Multiple Select

Phospholipid heads are

• Nonpolar

• Polar

• Hydrophilic

• Hydrophobic

Selectively Permeable

Multiple Choice

What characteristic does the phospholipid bilayer have that allows smaller molecules to pass through the cell membrane?

• 
  The phospholipid bilayer can easily move around (is fluid) allowing small molecules to pass through.

• The phospholipid bilayer can not easily move around (is static), therefore is can not allow any molecules to pass through.

• The phospholipid bilayer has the ability to open and close like a draw bridge.

• 
  The phospholipid bilayer will only allow large particles to pass through.

Multiple Choice

What type of molecule has the most difficult time passing through the membrane? 

• small & hydrophobic

• small & hydrophilic

• large & hydrophobic

• large & hydrophilic

Multiple Choice

Which of the following molecules cannot pass through the membrane via simple diffusion?

• carbon dioxide

• oxygen

• water

• small lipid

Simple Diffusion

Multiple Choice

Simple diffusion flows from

• high to low concentration

• low to high concentration

Multiple Choice

Simple diffusion is 

• a form of active transport and requires energy

• a form of active transport and does not require energy

• a form of passive transport and requires energy

• a form of passive transport and does not require energy

Facilitated Diffusion

Multiple Choice

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

• low to high

• 
  high to low

• low to low

Multiple Choice

Passive Transport uses ____ energy

• no

• a lot of

• a little bit of

• some

Multiple Choice

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

• a phospholipid

• a carbohydrate

• a membrane-spanning protein

Multiple Choice

What is a difference between diffusion and facilitated diffusion?

• movement of particles from [high] to [low]

• movement of particles from [low] to [high]

• a protein "helper"

• energy

Active Transport

Multiple Choice

Which type of transport requires an input of energy?

• Passive Transport

• Simple Diffusion

• Osmosis

• Active Transport

Multiple Choice

What is the difference between active and passive transport?

• Active does not need energy and passive uses ATP (energy)

• Active stores transport proteins and passive releases

• Active uses ATP (energy) and passive does not need energy

• Active uses hormones and passive does not

Multiple Choice

The sodium potassium pump usually pumps

• potassium out of the cell

• sodium into the cell

• sodium out of the cell

• both potassium and sodium into the cell

Multiple Choice

Active transport is the movement of large materials across a cell membrane from ______ to ______ concentration

• high to low

• low to high

• high to high

• low to low

Exocytosis & Endocytosis

Multiple Choice

Which is NOT a form of active transport?

• Endocytosis

• Exocytosis

• Pinocytosis

• Osmosis

Multiple Choice

When cells take in food particles through active transport, what is it called?

• Pinocytosis

• Phagocytosis

• Exocytosis

• Osmosis

Multiple Choice

Which form of active transport is being shown?

• Pinocytosis

• Endocytosis

• Exocytosis

• Osmosis

Multiple Choice

Which does NOT require energy to occur?

• Active Transport

• Passive Transport

• Endocytosis

• Exocytosis

Multiple Choice

A general term for the various types of active transport that move particles into a cell by enclosing them in a vesicle made out of plasma membrane.

• Endocytosis

• Exocytosis

• Osmosis

• Diffusion

And now for some final questions...

Match

Match the following

Red blood cells in hypertonic solution

red blood cell in hypotonic solution

Red blood cell in an isotonic solution

• Red blood cells in hypertonic solution

• red blood cell in hypotonic solution

• Red blood cell in an isotonic solution

Labelling

Drag the appropriate words to the correct part of the sentence.

Drag labels to their correct position on the image

Osmosis

polar

nonpolar

charged

aquaporin

small

Poll

How do you feel about the cell membrane topic right now?

• I could teach it to others!

• Pretty good. I would do okay on test.

• Still very confused and need more time.

• I don't even know what I don't know!

Open Ended

What questions do you have? Which topic do you need more information about?