Diffusion Quiz

Exocytosis

Process by which a cell releases large amounts of material

Are endocytosis and exocytosis forms of passive or active transport?

active

Is facilitated diffusion passive or active transport?

passive

Is simple diffusion passive or active transport?

passive

During exocytosis, which organelles fuse with the cell membrane?

vesicles

Hypertonic

when comparing two solutions, the solution with the greater concentration of solutes

Hypotonic

when comparing two solutions, the solution with the lesser concentration of solutes

isotonic

when the concentration of two solutions is the same

Phagocytosis

A type of endocytosis in which a cell engulfs large particles or whole cells

pinocytosis

A type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes.

Circle the statements below that would be TRUE about simple diffusion. HINT: There is more than one!

A) It is a form of passive transport. B) Molecules travel with the concentration gradient. c) D) It is how oxygen and carbon dioxide travel across the membrane.

which molecule powers active transport?

ATP

how are active and passive transport different

Active and Passive transport are different by how active transport requires an input of energy while passive transport does not require an input of energy. Active transport requires the input of the molecule ATP and passive transport does not have any input of energy. Active transport goes from low concentration to high concentration while passive transport goes from high concentration to low concentration.

Osmosis

Diffusion of water through a selectively permeable membrane

How are -endo and -exocytosis similar and different?

Endocytosis and exocytosis are different by how endocytosis brings materials to the inside of the cell while exocytosis brings materials out of the cell Exocytosis has the vesicle being formed in the Golgi apparatus which then fuses with the membrane, while endo has the vesicle. (both need energy)

Sometimes, a substance can only travel across a cell membrane via facilitated diffusion. What is facilitated diffusion?

Facilitated diffusion is when molecules still have net movement of high concentration to low concentration, but they may be too large or have other characteristics that prevent them from traveling directly across the selective cell membrane. They then have to go through a protein channel to get across membrane.

In diffusion, the net movement of a substance travels down its concentration gradient. Explain using the image below.

In diffusion the net movement or overall, of a substance will travel from an area of high concentration to an area of low concentration.

When diffusion has reached equilibrium, we say that the net movement of the molecules is zero. Does this mean these molecules below would stop moving? Explain using the image below

The molecules will not stop moving. The molecules are continuously moving even when they have reached equilibrium. It is just that the overall movement has moved from an area of high concentration to an area of low concentration. In the image below we see the molecules have reached equilibrium, but they are still moving continuously.

receptor-mediated Endocytosis

The movement of specific molecules into a cell by the inward budding of membranous vesicles containing proteins with receptor sites specific to the molecules being taken in; enables a cell to acquire bulk quantities of specific substances.

how are active and passive transport similar

They are similar by how they both transport molecules across the cell membrane.

Which cell part controls active transport?

cell membrane

phosolipid bilayer

cell membrane composed of polar heads and non polar tails

Simple diffusion can occur through a cell membrane! According to the video, what are some cell membrane characteristics that can affect the diffusion rate?

distance, temperature, characteristics of solvent, characteristic of the substance, and characteristic of barrier

heads

hydrophilic (water loving)

tails

hydrophobic (water fearing)

Once inside a cell, what actually kills bacteria that have been swallowed by endocytosis?

lysosomes

simple diffusion

movement of a solute from an area of high concentration to an area of low concentration

Does facilitated diffusion require an input of energy?

no

Does simple diffusion require an input of energy?

no

Endocytosis

process by which a cell takes material into the cell by infolding of the cell membrane