Membrane Transport, Thermodynamics and Enzymes

Glutamate (E) has an _______ side chain.

• acidic

• basic

• neutral

• polar

Fill in the blank: Threonine (T) has a _______ side chain.

• Threonine (T) has a polar side chain.

• Threonine (T) has a nonpolar side chain.

• Threonine (T) has an aromatic side chain.

• Threonine (T) has a charged side chain.

Fill in the blank: Alanine (A) has a _______ side chain.

• side chain

• polar

• non-polar

• charged

What is passive transport?

• Movement of materials with energy input

• Movement of materials without energy input

• Movement of water only

• Movement of materials against concentration gradient

Fill in the blank: Diffusion occurs down the ________ gradient.

• concentration

• temperature

• pressure

• electrical

Which type of transport requires energy to move substances across the membrane?

• Passive transport

• Active transport

• Osmosis

• Facilitated diffusion

What is osmosis?

• Movement of proteins

• Movement of water

• Movement of ions

• Movement of lipids

What is the movement of water across lipid bilayers called?

• Diffusion

• Osmosis

• Filtration

• Active Transport

Water moves from regions of ______ solute concentration to regions of ______ solute concentration.

(a)  

What does the movement of water during osmosis do to the concentration on both sides of the bilayer?

• Increases concentration on one side

• Decreases concentration on one side

• Equalizes the concentration

• Has no effect