BY116L Quiz 1

Larger solute molecules have a greater affect on osmolarity than smaller solute molecules.

false

\_________ is the random movements of particles in a fluid.

Brownian Motion

Concentration gradient and rate of diffusion are directly related.

true

Molecules crossing a membrane by passing between the phospholipids are crossing by \_________.

simple diffusion

Rate of diffusion is inversely related to the size of the substrate.

true

The cell placed in an hypertonic solution will cause it to \__________.

crenate

All osmotically active molecules dissociate in water to form multiple particles.

false

The concentration of osmotically active particles in solution is referred to as \________.

osmolarity

Only molecules that cannot diffuse to equilibrium across the semipermeable membrane will cause osmosis to occur.

true

Osmosis occurs as water moves form an area of lower solute concentration to an area of higher solute concentration.

true

Temperature and rate of diffusion are directly related.

true

Absorption and exchange surfaces tend to be very convoluted. This increase in surface area tends to increase the rate of \_________.

diffusion

If net diffusion is occurring, there will be a net change in \________ over time.

concentration

Net diffusion stops at \__________.

equilibrium

Pure water would be hypertonic and cause cells to crenate.

false

Osmolarity is always double molarity (molarity x 2 \= osmolarity)

false

A solute that diffuses to equilibrium across a semipermeable membrane will still cause osmosis to occur if it is only solute in the solution.

false

hypo

lyse

hyper

crenate

256 mmHg can’t cross a semipermeable membrane add more solute to the right the osmotic pressure will

increase

molecules that can’t cross semipermeable membrane are osmotically active

true

osmolarity and molarity are equal

false

a cell mediated transport process that uses ATP as an energy source

primary/active transport

for secondary active transport to occur, a primary/active transport process must have occurred to create and/or maintain a concentration gradient

true