Homeostasis

What makes a membrane selectively permeable?

• The ability to remove bacteria from a cell

• The ability to use energy to make proteins used in the cell

• The ability to modify, sort, and package proteins and lipids for storage for transport out of the cell

• The ability to allow needed materials to enter and wastes to exit as well as the ability to block unneeded materials from entering the cell

Phospholipids are molecules that--

• contain phosphate groups

• form the bilayer of the cell membrane

• have nonpolar tails and polar heads

• all of the above

Which label shows transport proteins that could be used during facilitated diffusion?

• A

• B

• C

Which of the following items would be able to diffuse directly through the cell membrane as seen in the diagram?

• Water

• Glucose

• Potassium

• Calcium

A difference in the amount of substance in one area as compared to the same substance in another area is--

• equilibrium

• homeostasis

• concentration gradient

• osmosis

Tags

NGSS.HS-PS1-5

Some molecules can pass through the cell membrane while others cannot. What can you conclude from the model?

• The cell membrane is not permeable.

• The cell membrane is completely permeable.

• The cell membrane is semi-permeable.

Which cell process will move substances against a concentration gradient?

• 1

• 2

• 3

• 4

Which structure allows the passage of the oxygen molecule to the environment?

• A (nucleus)

• B (cell membrane)

• C (vacuole)

• D (chloroplast)

Tags

NGSS.MS-LS1-2

As a result of diffusion, the concentration of many types of substances--

• always remains greater inside a membrane

• always remains greater outside a membrane

• becomes imbalanced on both sides of the membrane

• eventually becomes balanced, creating equilibrium

Which process is best represented by the diagram?

• Endocytosis

• Phagocytosis

• Exocytosis

• Pinocytosis