Unit 3: Cell Transport & Cellular Processes

How does the cell membrane in the diagram above help to maintain the health of this cell?

• By providing support and structure for the cell

• By regulating the transport of materials in and out of the cell

• By manufactruing protein to provide energy for the cell

• By storing food as future energy for the cell

Tags

NGSS.MS-LS1-2

Which of the following best explains the process illustrated in the above diagram?

• Passage of water molecules through a semi-permeable membrane to equalize concentration

• Transport of molecules across a membrane from a high to low concentration gradient by means of a carrier molecule

• Movembent of molecules against a concentration gradient expending energy

• Separation of suspended particles from a fluid environment through a porous membrane

which of the following describes a form of active transport?

• Oxygen transfers into red blood cells through small gaps in the cell membrane from oxygen-rich environment surround the cells

• Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vesicle

• water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure

• membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium

Which of the following describes a form of passive transport?

• Membrane proteins act as an enzyme to break down ATP and use the energy to move particles against the concentration gradient.

• Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vesicle.

• Membrane proteins use the energy of the cell's resting potential to move particles against the concentration gradient.

• Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

Which of the following describes osmosis?

• oxygen transfers into red blood cells through small gaps in the cell membrane from oxygen-rich environment surround the cells

• Large molecules are brought into the cell by wrapping the cell membrane around the molecules to form a vesicle.

• Water moves across the cell membrane from the side with high osmotic pressure towards the side with low osmotic pressure.

• Membrane proteins provide a pathway for larger particles to move across the cell membrane and bring the cell and environment closer to equilibrium.

How do cells maintain homeostasis without using energy?

• Membrane proteins breakdown moklecules to move other molecules from low concentration to high concentration

• Membrane proteins use the negative charge inside of the cell to increase the concentration of a chemical inside of the cell

• Maintaining osmotic balance by taking in or releasing water to match the water concentration of the extracellular environment

• Form the cell membrane around food to create a vacuole that is kept separate from the rest of the cytoplasm while enzymes break down the food.

Tags

NGSS.HS-LS1-3

Due to environmental changes, the water concentration outside of a cell becomes lower than the water concentration inside of the cell. How would the cell most likely respond to maintain homeostasis?

• The cell would fill with water

• The cell would release water

• The cell would increase the production of salt

• The cell would decrease the production of salt.

Tags

NGSS.HS-LS1-3

How do cells use energy to maintain homeostasis

• Membrane proteins allow chemicals to move from high concentrations to low concentration until equilibrium is reached.

• Form a vacuole around cellular waste and fuse the vacuole with the cell membrane to release the waste into the extracellular environment

• Breakdown sugar to synthesize adenosine triphosphate (ATP) from adenosine diphosphate (ADP) and phosphate

• Maintaining osmotic balance by taking in water or releasing water to match the water concentration of the extracellular environment.

Tags

NGSS.HS-LS1-3

NGSS.HS-LS1-7

Dialysis tubing containing starch solution was placed in a beaker with water/iodine solution. After 10 minutes the water stayed red, but the starch inside the dialysis tube turned black.

If dialysis tubing representes a cell membrane in this demonstration, what process is being observed in the changing color of the starch solution?

• Iodine cannot pass through a membrane.

• A semipermeable membrane will diffuse selected molecules. (iodine and not starch)

• A permeable membrane diffuses chemicals in and out of its surface.

• Starch can be easily diffused through a membrane

A scientist is investigating cell transprort. She observes molecules being transported into a cell through proteins present in the cell membrane. These proteins do not use energy to transport the molecules.

Which of the following best explains the type of cell transport observed by the scientist?

• Active transport because membrane proteins were used

• Diffusion because the molecules were entering the cell.

• Facilitated diffusion because the proteins were not using energy

• Osmosis because the molecules were moving against the concentration gradient.