Lecture 11: Cell Transport (English Sub)

Biology: Cell Transport Lecture (English)

Multiple Choice

Concentration gradients move things from

• high to low density

• from low to high density

Fill in the Blank

Molecular gradients across cell membranes have both a strength and __________

Multiple Choice

Which direction will the concentration gradient in this picture flow for molecule x?

• to the right

• to the left

Multiple Choice

How is a gradient's strength decreased?

• by allowing molecules to flow with it

• by moving molecules against it

Multiple Choice

How is a gradients strength increased?

• moving molecules against a gradient

• moving molecules with a gradient

Multiple Choice

The purple molecule wants to move

• into the cell

• out of the cell

Fill in the Blank

Concentration gradients disappear when a cell is at _________. Meaning, that materials flow in and out at the same rate.

Multiple Choice

Which molecule is being moved through the cell by facilitated diffusion?

• green

• blue

Multiple Choice

The blue molecule is moving through the membrane through

• active transport

• facilitated diffusion

• simple diffusion

Multiple Choice

Both types of transport shown

• require cellular energy

• do not require cellular energy

Fill in the Blank

What form of energy is needed for active transport?

Fill in the Blank

Cell eating is called

Fill in the Blank

Cell drinking is called

Multiple Choice

Using receptors to take in materials

• endocytosis

• exocytosis

Fill in the Blank

Lipid bilayer containers used by cells for endocytosis and exocytosis.

Fill in the Blank

Movement of water across cell membranes

Fill in the Blank

Water follows

Multiple Choice

Cells placed in salt water

• A

• B

• C

Multiple Choice

(S stands for solute) Osmotic flow is

• into the cell

• out of the cell

Multiple Choice

In order to be in homeostasis, cells must regulate solute concentrations inside their cells for proper osmotic flow. This concentration is most easily achieved in

• hypertonic environments

• hypotonic environments

• isotonic environments