Exploring Passive Transport and Selective Permeability

What is passive transport primarily about?

• Molecules moving up their concentration gradient

• Molecules requiring energy to move

• Molecules moving down their concentration gradient

• Molecules moving randomly without any gradient

Which type of molecules can easily diffuse through the cellular membrane?

• Large and charged molecules

• Small and non-charged molecules

• Large and non-charged molecules

• Small and charged molecules

Why can carbon dioxide diffuse well across cellular membranes?

• Because it is small and charged

• Because it is large and non-charged

• Because it is small and non-charged

• Because it is large and charged

What is a characteristic of molecular oxygen that allows it to diffuse through the membrane?

• It is large and non-charged

• It is small and non-charged

• It is large and charged

• It is small and charged

Why do sodium and potassium ions have trouble diffusing through the membrane?

• They are non-charged

• They are too small

• They are attracted to the hydrophilic heads and cannot pass the hydrophobic tails

• They are too large

What is the main reason charged ions cannot passively diffuse through the membrane?

• They are too small

• They are non-charged

• They are repelled by the hydrophilic heads

• They are attracted to the hydrophilic heads and cannot pass the hydrophobic tails

How do water molecules manage to diffuse through the membrane despite their partial charges?

• Their partial charges are not strong enough to prevent diffusion

• They are large enough to pass through

• They are repelled by the hydrophilic heads

• They are attracted to the hydrophobic tails

What characteristic of water molecules allows them to slowly diffuse through the membrane?

• They are large and non-charged

• They are small and non-charged

• They are small and have partial charges

• They are large and charged

What type of molecules would have the most difficulty diffusing through the cellular membrane?

• Large and non-charged molecules

• Small and charged molecules

• Large and charged molecules

• Small and non-charged molecules

What will be discussed in the next video?

• Active transport

• Facilitated passive transport

• Osmosis

• Endocytosis