Active Transport in Bacteria

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What is the main function of carrier proteins in facilitated diffusion?

Provide a direct passageway for specific molecules

Facilitate movement of molecules against their concentration gradient

Act as channels for molecules to pass through

Bind specific solute and undergo conformational changes (correct)

In facilitated diffusion, what happens when the concentration gradient dissipates?

The passage of molecules into the cell stops (correct)

Molecules start moving out of the cell

Molecules continue to enter the cell regardless

The carrier proteins change shape

How do channel proteins differ from carrier proteins?

They bind specific solutes and undergo conformational changes

They require energy input for molecule transport

They move molecules against their concentration gradient

They facilitate passive diffusion of molecules (correct)

Which statement is true about active transport?

It requires energy input to move molecules against their concentration gradient Signup and view all the answers

What distinguishes primary active transport from facilitated diffusion?

Primary active transport requires energy input Signup and view all the answers

In secondary active transport, what is the role of carrier proteins?

They bind specific solutes and undergo conformational changes Signup and view all the answers

What distinguishes active transport from facilitated diffusion?

Active transport uses metabolic energy, while facilitated diffusion does not. Signup and view all the answers

What type of transport is characterized by carriers called primary active transporters?

Primary active transport Signup and view all the answers

What is the distinguishing feature of primary active transporters in terms of the molecules they move?

They move a single molecule across the membrane. Signup and view all the answers

How does secondary active transport differ from primary active transport?

It does not directly use energy from ATP hydrolysis. Signup and view all the answers

Which statement best describes cotransporters in secondary active transport?

They move molecules in the same direction. Signup and view all the answers

What type of carrier proteins can be either uniporters or cotransporters?

Carrier proteins Signup and view all the answers

What is the defining characteristic of symporter proteins in secondary active transport?

They transport an ion and another substance in the same direction Signup and view all the answers

What distinguishes uniporters from cotransporters in terms of the substances they move across the membrane?

Cotransporters move two substances simultaneously Signup and view all the answers

Which type of transporter moves an ion and another substance in opposite directions?

Antiporter Signup and view all the answers

In group translocation active transport, what is chemically modified as it is brought into the cell?

The substance being transported Signup and view all the answers

What is the distinguishing feature of the Sugar phosphotransferase system (PTS) regarding active transport?

It uses an energy-rich organic compound other than ATP Signup and view all the answers

Why is iron uptake by siderophores essential for microbes?

To support the function of cytochromes and enzymes Signup and view all the answers

Active Transport in Bacteria

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