Microbiology Chapter 4 Passive transport (passive diffusion and facilitated diffusion)

What is a characteristic of passive transport?

• Involves active transport proteins

• Moves substances from low to high concentration

• Moves substances from high to low concentration without using energy

• Requires ATP to move substances

Which of the following molecules can pass directly through the membrane via simple diffusion?

• Large hydrophilic molecules

• Water, gases (O2, CO2), and small hydrophobic molecules

• Ions like sodium and potassium

• Proteins

What is the direction of movement for molecules during simple diffusion?

• Against the concentration gradient, requiring ATP

• From high to low concentration without using ATP

• From low to high concentration, requiring energy

• Through transport proteins using ATP

Which process does water follow when moving across the membrane in simple diffusion?

• Active transport

• Facilitated diffusion

• Osmosis

• Phagocytosis

What is a key feature of simple diffusion?

• It uses transport proteins to move molecules

• It requires ATP to move molecules across the membrane

• Molecules move with their concentration gradient without energy usage

• It only works for large hydrophilic molecules

Which of the following is NOT true about simple diffusion?

• It allows small hydrophobic molecules to pass through the membrane

• It requires ATP for movement across the membrane

• It works for gases like O2 and CO2

• It moves substances from high to low concentration

Which of the following best describes facilitated diffusion?

• Molecules move from low to high concentration using ATP

• Molecules pass through transport proteins down their concentration gradient without ATP

• Molecules move against the concentration gradient using energy

• It requires the use of vesicles for transport

What type of molecules typically use facilitated diffusion to cross the membrane?

• Small hydrophobic molecules

• Water molecules via osmosis

• Impermeable molecules that cannot pass through the lipid bilayer

• Large proteins that need to be actively transported

What is the role of transport proteins in facilitated diffusion?

• To move molecules against their concentration gradient

• To use ATP to pump molecules across the membrane

• To span the lipid bilayer and allow molecules to pass through

• To act as enzymes to break down molecules

Which of the following is true regarding facilitated diffusion?

• It requires ATP to move molecules

• It moves molecules from low to high concentration

• It involves transport proteins and moves molecules down the concentration gradient

• It is only used for small hydrophobic molecules