COPY: Cell Transport

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What is the primary function of cell transport?

To regulate cell growth
To store genetic information
To synthesize proteins
To facilitate the movement of substances across the cell membrane (correct)

What type of substances can readily pass through a phospholipid bilayer?

Carbohydrates
Proteins
Lipid-soluble substances (correct)
Water-soluble substances

Which of the following is a characteristic of the cell membrane?

Porously permeable barrier
Permeable barrier
Semi-permeable barrier (correct)
Impermeable barrier

What is the term for the movement of water molecules through the cell membrane?

Osmosis (C) Signup and view all the answers

What is the process of transporting substances out of the cell through the cell membrane?

Exocytosis (A) Signup and view all the answers

What is the role of membrane proteins in cell transport?

To provide an alternative pathway across the lipid bilayer (A) Signup and view all the answers

What is the characteristic of facilitated diffusion?

Rate of transport is directly proportional to the concentration of the diffusing substance (A) Signup and view all the answers

What is the main difference between simple diffusion and facilitated diffusion?

Simple diffusion occurs through the lipid bilayer, while facilitated diffusion occurs through specific proteins (A) Signup and view all the answers

What is the term for the minimum pressure required to stop osmosis?

Osmotic pressure (D) Signup and view all the answers

What is the primary function of aquaporins in the cell?

To facilitate the transport of water across the membrane (C) Signup and view all the answers

What is the characteristic of active transport?

Molecules move against their concentration gradient (A) Signup and view all the answers

What is the primary function of facilitated diffusion proteins?

To allow molecules to pass through the membrane (C) Signup and view all the answers

What is the main characteristic of ion channels?

They are highly selective and allow passage of specific ions or molecules (C) Signup and view all the answers

What is the purpose of aquaporins?

To allow water molecules to cross the membrane rapidly (B) Signup and view all the answers

What is the main difference between voltage-gated and ligand-gated channels?

Voltage-gated channels open in response to changes in voltage, while ligand-gated channels open in response to ligand binding (A) Signup and view all the answers

What is the energy source for primary active transport?

Breakdown of ATP or similar (D) Signup and view all the answers

What is the mechanism of secondary active transport?

The transport of molecules using the energy from the concentration gradient of the driving ion (B) Signup and view all the answers

What is the difference between symport and antiport?

Symport is the transport of two substances in the same direction, while antiport is the transport of two substances in opposite directions (D) Signup and view all the answers

What is the purpose of transcellular transport?

To transport substances across the cell from one ECF compartment to another (A) Signup and view all the answers

What is the mechanism of receptor-mediated endocytosis?

The binding of ligands to specific receptors on the cell surface (B) Signup and view all the answers

What is the difference between constitutive secretion and regulated secretion?

Constitutive secretion does not need a signal, while regulated secretion needs a signal (D) Signup and view all the answers

What is the primary function of the cell membrane as a barrier to substance movement?

To regulate the passage of substances into and out of the cell (A) Signup and view all the answers

Which type of transport does not require energy input to occur?

Passive transport (B) Signup and view all the answers

What determines the permeability of the cell membrane to certain substances?

The lipid solubility of the substance (C) Signup and view all the answers

What is the primary function of osmosis in cell transport?

To maintain the balance of water and solutes within the cell (B) Signup and view all the answers

What is the process by which cells take in external substances?

Endocytosis (C) Signup and view all the answers

Which type of transport does not require the cell to expend energy?

Passive transport (A) Signup and view all the answers

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

To bind to molecules or ions and facilitate their transport across the membrane (C) Signup and view all the answers

What determines the rate of simple diffusion across a membrane?

The lipid solubility of the substance (C) Signup and view all the answers

Which type of molecules can diffuse directly through the lipid bilayer?

Small hydrophobic molecules (B) Signup and view all the answers

What is the maximum rate of transport achieved by a carrier protein in facilitated diffusion?

Vmax (B) Signup and view all the answers

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

To bind to specific molecules and facilitate their passage across the membrane (C) Signup and view all the answers

What is the characteristic of ion channels that allows them to be selective?

Their ability to allow only specific ions to pass through (C) Signup and view all the answers

What is the function of aquaporins in the cell membrane?

To allow water molecules to cross the membrane more rapidly (B) Signup and view all the answers

What is the term for the simultaneous transport of two substances across a membrane in the same direction?

Symport (C) Signup and view all the answers

What is the primary function of voltage-gated channels?

To mediate the passage of ions across the plasma membrane in response to changes in voltage (A) Signup and view all the answers

What is the mechanism of transcellular transport?

Active transport through the cell membrane on one side and facilitated diffusion on the other (D) Signup and view all the answers

What is the function of receptor-mediated endocytosis?

To internalize specific molecules bound to receptors (B) Signup and view all the answers

What is the primary function of ion channels in the plasma membrane?

To mediate the passage of ions across the plasma membrane (B) Signup and view all the answers

What is the term for the process of transporting molecules out of the cell through the cell membrane using part of the membrane itself as a carrier?

Exocytosis (A) Signup and view all the answers

What is the primary function of constitutive secretion?

To incorporate proteins into the plasma membrane or extracellular matrix (B) Signup and view all the answers

What is the main function of the cell membrane in terms of substance movement?

To act as a semi-permeable barrier (B) Signup and view all the answers

What is the characteristic of substances that can readily pass through a phospholipid bilayer?

They are lipid-soluble (C) Signup and view all the answers

What is the purpose of the transport of substances across the cell membrane?

To maintain cellular homeostasis (B) Signup and view all the answers

What is the key difference between passive and active transport?

The energy requirement (A) Signup and view all the answers

What is the term for the movement of water molecules from an area of high concentration to an area of low concentration?

Osmosis (C) Signup and view all the answers

What is the primary function of membrane proteins in cell transport?

To act as channels or carriers for molecule transport (D) Signup and view all the answers

What determines the permeability of small hydrophobic molecules across the lipid bilayer?

The lipid solubility of the molecule (A) Signup and view all the answers

What is the characteristic of facilitated diffusion that distinguishes it from simple diffusion?

It is specific to certain molecules or ions (A) Signup and view all the answers

What is the role of aquaporins in the cell membrane?

To act as channels for the transport of water molecules (A) Signup and view all the answers

What is the term for the movement of water molecules from an area of high concentration to an area of low concentration?

Osmosis (D) Signup and view all the answers

What is the maximum rate of transport achieved by a carrier protein in facilitated diffusion?

Vmax (A) Signup and view all the answers

What is the primary mechanism of facilitated diffusion?

Passive transport with the help of carrier proteins (A) Signup and view all the answers

What is the characteristic of ion channels that allows them to be selective?

All of the above (D) Signup and view all the answers

What is the primary function of aquaporins?

To transport water molecules across the cell membrane (B) Signup and view all the answers

What is the primary function of voltage-gated channels?

To transmit information along the length of a neuron (B) Signup and view all the answers

What is the primary mechanism of receptor-mediated endocytosis?

The binding of a ligand to a specific receptor (D) Signup and view all the answers

What is the primary function of facilitated diffusion proteins?

To bind to specific molecules and undergo conformational changes (B) Signup and view all the answers

What is the primary function of secondary active transport?

To couple the movement of an ion down its electrochemical gradient to the uphill movement of another molecule (B) Signup and view all the answers

What is the primary function of ion channels in the plasma membrane?

To regulate the amount of ions in the cell (A) Signup and view all the answers

What is the primary function of transcellular transport?

To transport molecules from one ECF compartment to another (C) Signup and view all the answers

What is the primary function of constitutive secretion?

To transport molecules out of the cell without the need for a signal (D) Signup and view all the answers

COPY: Cell Transport

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Questions and Answers

What is the primary function of cell transport?

What type of substances can readily pass through a phospholipid bilayer?

Which of the following is a characteristic of the cell membrane?

What is the term for the movement of water molecules through the cell membrane?

What is the process of transporting substances out of the cell through the cell membrane?

What is the role of membrane proteins in cell transport?

What is the characteristic of facilitated diffusion?

What is the main difference between simple diffusion and facilitated diffusion?

What is the term for the minimum pressure required to stop osmosis?

What is the primary function of aquaporins in the cell?

What is the characteristic of active transport?

What is the primary function of facilitated diffusion proteins?

What is the main characteristic of ion channels?

What is the purpose of aquaporins?

What is the main difference between voltage-gated and ligand-gated channels?

What is the energy source for primary active transport?

What is the mechanism of secondary active transport?

What is the difference between symport and antiport?

What is the purpose of transcellular transport?

What is the mechanism of receptor-mediated endocytosis?

What is the difference between constitutive secretion and regulated secretion?

What is the primary function of the cell membrane as a barrier to substance movement?

Which type of transport does not require energy input to occur?

What determines the permeability of the cell membrane to certain substances?

What is the primary function of osmosis in cell transport?

What is the process by which cells take in external substances?

Which type of transport does not require the cell to expend energy?

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

What determines the rate of simple diffusion across a membrane?

Which type of molecules can diffuse directly through the lipid bilayer?

What is the maximum rate of transport achieved by a carrier protein in facilitated diffusion?

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

What is the characteristic of ion channels that allows them to be selective?

What is the function of aquaporins in the cell membrane?

What is the term for the simultaneous transport of two substances across a membrane in the same direction?

What is the primary function of voltage-gated channels?

What is the mechanism of transcellular transport?

What is the function of receptor-mediated endocytosis?

What is the primary function of ion channels in the plasma membrane?

What is the term for the process of transporting molecules out of the cell through the cell membrane using part of the membrane itself as a carrier?

What is the primary function of constitutive secretion?

What is the main function of the cell membrane in terms of substance movement?

What is the characteristic of substances that can readily pass through a phospholipid bilayer?

What is the purpose of the transport of substances across the cell membrane?

What is the key difference between passive and active transport?

What is the term for the movement of water molecules from an area of high concentration to an area of low concentration?

What is the primary function of membrane proteins in cell transport?

What determines the permeability of small hydrophobic molecules across the lipid bilayer?

What is the characteristic of facilitated diffusion that distinguishes it from simple diffusion?

What is the role of aquaporins in the cell membrane?

What is the term for the movement of water molecules from an area of high concentration to an area of low concentration?

What is the maximum rate of transport achieved by a carrier protein in facilitated diffusion?

What is the primary mechanism of facilitated diffusion?

What is the characteristic of ion channels that allows them to be selective?

What is the primary function of aquaporins?

What is the primary function of voltage-gated channels?

What is the primary mechanism of receptor-mediated endocytosis?

What is the primary function of facilitated diffusion proteins?

What is the primary function of secondary active transport?

What is the primary function of ion channels in the plasma membrane?

What is the primary function of transcellular transport?

What is the primary function of constitutive secretion?

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