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Crossing Membranes Quiz

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Questions and Answers

Which type of molecules can diffuse freely across membranes?

Charged ions

Large polar molecules

Large uncharged molecules

Small uncharged molecules (correct)

What is the major difference between channels and carrier proteins in facilitated diffusion?

Channels transport two molecules, while carrier proteins transport one molecule

Channels form pores, while carrier proteins undergo a conformational change (correct)

Channels require energy (ATP), while carrier proteins do not

Channels are highly specific to their solute, while carrier proteins are not

What is the function of symporters in facilitated diffusion?

Transport two molecules in the same direction (correct)

Transport charged ions

Transport only large polar molecules

Transport two molecules in opposite directions

What is the specificity of aquaporins in facilitated diffusion?

Specific to H2O Signup and view all the answers

What are the things that open the channel?

Voltage, ligand, temperature, pressure Signup and view all the answers

What is the main energy storage molecule and its charge?

ATP, negative charge Signup and view all the answers

What converts a chemical signal into the cell for Na+, K+ and Ca2+?

Ligand-gated ion channels Signup and view all the answers

What causes depolarization in cell membranes?

The interior voltage becomes less negative Signup and view all the answers

What is the function of aquaporins?

Allow rapid passage of water Signup and view all the answers

What is the role of voltage-gated sodium channels?

Transmit signals in a wave through the nervous system Signup and view all the answers

What is the function of transient receptor potential cation channel subfamily V member 1 (TrpV1)?

Temperature-gated Signup and view all the answers

What allows potassium ions to pass but blocks smaller sodium ions?

Potassium channels Signup and view all the answers