Amoeba Sisters Video Recap of Osmosis/Diffusion

During osmosis

• water moves from high to low concentration

• large or oddly shaped molecules move across a cell membrane

• water moves when energy is used

• proteins are built

Answer explanation

During osmosis, water moves from high to low concentration, following the concentration gradient. This process does not require energy and is essential for maintaining cell homeostasis.

In the given scenario what will happen?  An egg is placed in pure water for 48 hours.

• The egg will gain water and swell.

• Water will move in and out of the cell equally, and the cell with neither shrink nor swell.

• The egg will lose water and shrink.

Answer explanation

In the given scenario, the egg will gain water and swell because water will move into the egg due to osmosis, causing it to increase in size.

The picture below is an example of _________________.

• osmosis

• isotonic

• diffusion

• active transport

Answer explanation

The picture below is an example of diffusion, where molecules move from an area of high concentration to low concentration.

Passive transport requires no

• concentration gradients

• osmosis

• motion

• energy

Answer explanation

Passive transport requires no energy, as it relies on the movement of molecules down their concentration gradient without the need for additional energy input.

_______ regulates what enters and leaves a cell.  

• Cell Membrane

• Nucleus

• Mitochondria

• Cytoplasm

Answer explanation

The Cell Membrane regulates what enters and leaves a cell, making it the correct choice.

Which way will the water molecules move during osmosis?

• Out of the cell, so the cell shrinks.

• Out of the cell, so the cell swells.

• Into the cell, so the cell shrinks.

• Into the cell, so the cell swells.

Answer explanation

During osmosis, water molecules move out of the cell, causing the cell to shrink.

What is diffusion?

• when molecules move 

• when molecules move from a high concentration to a low.

• no movement 

• molecules move everywhere

Answer explanation

Diffusion is when molecules move from a high concentration to a low concentration, spreading out evenly.

Which diagram best shows the end result of diffusion?

• F

• G

• H

• J

Answer explanation

Diagram J best shows the end result of diffusion as it depicts the spreading of particles from an area of high concentration to an area of low concentration.

 An animal cell placed in a hypertonic (salty) solution will

• Stay the same

• Shrink- get smaller

• Swell- get bigger

Answer explanation

An animal cell placed in a hypertonic (salty) solution will shrink and get smaller due to water leaving the cell to balance the concentration gradient.

Tags

NGSS.MS-LS1-5

What is the definition of  Selective Permeability?

• The movement of materials across the cell membrane that requires NO ENERGY from the cell.
  

• The movement of materials through (or across) the cell membrane
  

• The ability of the cell membrane to allow some things to pass through while preventing other things from passing through.

• The movement of molecules from an area of high concentration to a area of low concentration 
  

Answer explanation

The ability of the cell membrane to allow some things to pass through while preventing other things from passing through.