Transport Processes

Which of the following is not a small, non-polar molecule?

• Carbon Dioxide

• Methane

• Water

• Molecular Oxygen

A molecule is amphipathic if:

• It has both a hydrophilic end and a hydrophobic end.

• It has two hydrophilic ends separated by a hydrophobic center.

• It has two hydrophobic ends separated by a hydrophilic center.

• It is made of alternating hydrophilic and hydrophobic subunits.

What type of lipid is the primary component of biological membranes?

• triglycerides

• phospholipids

• sterols

• waxes

Which of the following would cross a membrane by simple diffusion?

• Na+

• Water

• Carbon Dioxide

• Sucrose

Diffusion occurs:

• any time a particle moves across a biological membrane

• any time a particle moves from where it is in high concentration to where it is in low concentration

• any time a particle moves from where it is in low concentration to where it is in high concentration

• any time a particle moves as a result of its intrinsic kinetic energy

The main difference between simple diffusion and facilitated diffusion is:

• only simple diffusion results in an equilibrium

• simple diffusion does not require an energy input while facilitated diffusion does

• facilitated diffusion moves small, non-polar molecules across membranes while simple diffusion moves polar or charged particles

• simple diffusion does not require a protein channel while facilitated diffusion does.

Osmosis is a special case of facilitated diffusion that supports the transport of:

• water

• methane

• glucose

• oxygen

A phospholipid with a carbohydrate chain attached to it is called a:

• glycoprotein

• glycohydrate

• glycolipid

• glyconucleotide

Transport processes that move particles from low concentration to a high concentration require:

• a particle that moves

• an input of energy

• a transmembrane channel

• all of these things

Which of the following moves across a membrane by primary active transport?

• water

• methane

• potassium ions

• carbon dioxide