Molecular Transport

What controls exchange in a cell?

plasma membrane

What is stable internal environment called?

homeostasis

Do plant cells lack membranes?

False

What is the structure of the phospholipid bilayer?

hydrophobic tails inside

What does selective permeability mean?

allows some, blocks others, some need ATP

Which of the following is NOT a transport method: Active, Diffusion, Hydrolysis, Osmosis?

Hydrolysis

Which transport methods require energy: Active, Osmosis, Facilitated, A & C?

A & C

Is transport against the gradient impossible?

False

Does osmosis mean spreading substances?

False

What is passive transport?

no ATP, high → low

What factors affect diffusion?

temp, size, gradient

If a solute cannot diffuse, what happens?

water moves to balance across the membrane (via osmosis)

What direction does water move in osmosis?

(draw arrow)

What type of transport is shown in the diagram?

Active transport

What happens to tissue in distilled water?

swell water

What happens to a cell in a 5% solute solution?

water out

What type of solution is a hypertonic solution?

hypertonic

Can plant cells survive in hypotonic solutions?

False

What is the result for animal cells in hypotonic solutions?

cytolysis

What is transport using proteins called?

facilitated diffusion

What type of transport uses ATP?

active transport

How does diffusion differ in cold vs hot tea?

slower in cold

Identify the method of molecular transport shown below.

Active Transport

Identify the method of molecular transport shown below

Facilitated diffusion

If you soak an animal cell in a solution with 5% solute,
what type of molecular transport will occur?

Water will exit the cells through osmosis.

A plant cell exposed to an extremely hypotonic environment cannot
survive.

False