Unit 4 Homeostasis and Transport

What does the term “homeostasis” mean?

• respond to their environment.

• maintain a stable internal environment.

• made up of units called cells.

• based on a universal genetic code.

Tags

NGSS.HS-LS1-3

What is the function of a cellular membrane?

• Keep structure and support for the cell

• Help regulate homeostasis and the flow of materials in and out of the cell

• Produce proteins for the cell

• control the activity of the cell

Tags

NGSS.HS-LS2-3

The cell membrane is made up of

• rigid cellulose outer layer

• Phospholipid bilayer

• triglyceride molecules

• complex of enzymes

The tails of the cell membrane are

• Hydrophobic, and they face towards in excellular fluid and intracellular cytoplasm

• Hydrophobic, and they face towards the middle of the membrane

• Hydrophilic, and they face towards in excellular fluid and intracellular cytoplasm

• Hydrophilic, and they face towards the middle of the membrane

The heads of the cell membrane are

• Hydrophobic, and they face towards in excellular fluid and intracellular cytoplasm

• Hydrophobic, and they face towards the middle of the membrane

• Hydrophilic, and they face towards in excellular fluid and intracellular cytoplasm

• Hydrophilic, and they face towards the middle of the membrane

The cell membrane is considered to be a fluid mosaic because

• it is flexible and has numerous proteins and carbohydrates embedded within the bilayer

• it is flexible and has numerous acids and carbohydrates embedded within the bilayer

• it is rigid and has numerous proteins and carbohydrates embedded within the bilayer

The lipid that helps keep the cell fluid.

• Glycogen

• Cellulose

• Starch

• Cholesterol

Membrane proteins function to

• help to transport ions and polar molecules into and out of the cell.

• help to stabilize and shape the membrane.

• allow the cell to be recognized by other cells.

• All of the above

Proteins with a tube like opening that allow large particles in and out of the cell.

• Channel protein

• Integral protein

• Peripheral protein

• Carrier protein

Proteins that can grab material on one side of the membrane and release it on the other.

• Channel protein

• Integral protein

• Peripheral protein

• Carrier protein