Passive Transport and Homeostasis

How is homeostasis important to the survival of organisms?

• Homeostasis makes organisms grow bigger and taller.
• Homeostasis helps organisms locate food.
• Homeostasis allows organisms to regulate their temperature.
• Homeostasis makes all organisms hibernate.

The cell membrane, or plasma membrane, is made up of a lipid bilayer in which hydrophilic heads face outward and hydrophobic tails face inward.
This arrangement within the cell membrane allows it to 

• fuse with ribosomes during DNA replication.
• absorb water from the cytoplasm whenever necessary.
• keep out all viral and bacterial infections.
• control the movement of substances in and out of the cell.

Which of the following types of passive transport involves water molecules moving from a high concentration to a low concentration?

• osmosis
• simple diffusion
• filtration
• facilitated diffusion

Examine the diagrams of plant cells.  Each cell has been placed in a different solution.
The cell in diagram 2 has been placed in a solution that contains __________ the interior of the cell.

• water that is warmer than
• a lower concentration of water than
• the same concentration of water as
• water that is cooler than

The cell membrane is mostly made of what 2 biomolecules?

• Lipids and Nucleic acids

• Protein and Nucleic acids

• Carbohydrates and lipids

• Lipids and Proteins

Which type of Passive transport uses the help of a transport protein?

• Osmosis

• Facilitated diffusion

• Simple diffusion

Passive transport moves molecules from...

• low concentration to high concentration

• high concentration to low concentration

What type of passive transport moves water molecules from high concentration to low concentration?

• Simple diffusion

• Osmosis

• Active transport

• Facilitated diffusion

What biomolecule is number one pointing to?

• Lipid

• Protein

• Nucleic Acid

• Carbohydrate

What is the name of structure 2?

• Glucosamine

• Phospholipid bilayer

• Hydrophrenous

• Protein channel