Membrane Transport 2021

If a solution outside a cell is more concentrated so that the cell loses water to its environment, the external solution is said to be __________ to the cell contents.

• Hypertonic

• In equilibrium

• Hypotonic

• Isotonic

Which mechanism of membrane transport requires energy?

• Facilitated diffusion

• osmosis

• diffustion

• active transport

Pinching in of fluids by a unicellular organism is the process of...

• phagocytosis

• osmosis

• pinocytosis

• exocytosis

Certain types of lymphocytes (white blood cells) in the lymph nodes ingest bacteria and debris. This function most likely occurs by

• exocytosis

• passive transport

• phagocytosis

• facilitated transport

Osmosis is a process that

• involves the movement of particles from saturated solutions

• uses energy to move water molecules from an area of higher concentration to an area of lower concentration

• involves the active transport of dissolved solids

• equalizes the concentration of particles by the movement of water molecules

Which substance would have normally have the LEAST difficulty crossing a cell membrane?

• oxygen

• protein

• carbohydrate

• sodium ions

Which requires the cell to use ATP?

• diffusion

• facilitated diffusion

• bulk transport

• osmosis

Phospholipid molecules in a membrane are arranged with their ____________ on the exterior and their ______________ on the interior.

• hydrophobic heads ... hydrophilic tails

• hydrophilic heads ... hydrophobic tails

• nonpolar heads ... polar tails

• hydrophobic tails ... hydrophilic heads

In osmosis, water always moves toward the ____________ solution.

• hypertonic

• isotonic

• hypotonic

• quadraphonic

In osmosis, water always moves toward the solution with the ______________________ solute concentration.

• greater

• lesser

• same

• more variable