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PHY201-B Lecture 2: Membrane Transport Mechanisms

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PHY201-B Lecture 2: Membrane Transport Mechanisms

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Questions and Answers

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

To synthesize large nonpolar molecules

To help transport molecules in and out of the cell (correct)

To act as receptors for the cell

To regulate the movement of gases in the cell

Which type of molecule can pass through the cell membrane easily?

Charged molecule

Large polar molecule

Small nonpolar molecule (correct)

Amino acid

What is the characteristic of symporter proteins?

Move molecules with their gradient

Move molecules in the same direction (correct)

Move molecules in opposite directions

Move molecules against their gradient

What is the process of molecules moving from higher concentration areas to lower concentration areas?

Diffusion Signup and view all the answers

What is the function of secondary active transporter proteins?

To move two molecules at the same time Signup and view all the answers

Which type of molecule is unable to pass through the cell membrane?

Glucose Signup and view all the answers

What is Fick's law used to model?

Transport processes Signup and view all the answers

What is the flux of molecules flowing through a membrane given in terms of?

Permeability of the membrane and concentration difference Signup and view all the answers

What is the direction of diffusive flux?

From high concentration to low concentration Signup and view all the answers

What is P in the equation J = P (C1-C2)?

Permeability of the membrane Signup and view all the answers

What is the condition for facilitated diffusion?

The system shows saturation kinetics Signup and view all the answers

What is the relation between J and concentration gradient?

J is directly proportional to the concentration gradient Signup and view all the answers