B.5C STAAR Q's

In animal cells, the sodium-potassium pump moves sodium and potassium ions against a concentration gradient across the cell membrane. What type of transport is used, AND why is this type of transport necessary?

• Active transport; it is necessary to move ions against their concentration gradient.

• Passive transport; it is necessary to move ions along their concentration gradient.

• Facilitated diffusion; it is necessary to move ions through a channel protein.

• Osmosis; it is necessary to balance water concentration.

The diagram represents the movement of three different substances across a cell membrane. Moving which of these substances across the cell membrane requires energy from ATP?

• A) 2 only

• B) 3 only

• C) 1 and 2

• D) 1 and 3

Which statements best describe the difference between active transport and passive transport?

• Active transport occurs only in cells that require large amounts of energy. Passive transport occurs in all cells.

• Active transport requires ATP. Passive transport does not require ATP.

• Active transport moves substances along the concentration gradient. Passive transport moves substances against the concentration gradient.

• Active transport occurs in all cells. Passive transport requires ATP.

A diagram of removing glucose from the blood by a fat cell is shown.

Which statement best describes the role of insulin and glucose-transport proteins in this process?

• They stimulate a response from white blood cells during glucose entry into the cell.

• They keep the plasma membrane flexible when glucose is removed from the blood.

• They help to maintain stable glucose levels both inside and outside the cell.

• They utilize the excess energy the cell produces to create more glucose.

Tags

NGSS.HS-LS1-3

Which type of movement across a cell’s plasma membrane requires energy supplied by ATP?

• Passive transport

• Simple diffusion

• Active transport

• Osmosis

Which statement describes the process of osmosis in an animal cell?

• Sugar molecules move across the plasma membrane until the cell has enough energy to grow in size and divide.

• Water molecules move across the plasma membrane until solute concentrations are equal on both sides of the membrane.

• Ions move across the plasma membrane until the inside of the cell has a higher concentration of positive charges.

• Enzymes move across the plasma membrane until the cell has completed metabolism.

Which table correctly identifies how the plasma membrane contributes to the maintenance of cellular homeostasis?

• Function: Controls materials that enter and exit the cell (Yes), Converts ATP to glucose for energy storage (No), Catalyzes protein synthesis (No), Receives signals for DNA replication (No)

• Function: Controls materials that enter and exit the cell (Yes), Converts ATP to glucose for energy storage (Yes), Catalyzes protein synthesis (No), Receives signals for DNA replication (No)

• Function: Controls materials that enter and exit the cell (Yes), Converts ATP to glucose for energy storage (No), Catalyzes protein synthesis (Yes), Receives signals for DNA replication (No)

• Function: Controls materials that enter and exit the cell (Yes), Converts ATP to glucose for energy storage (No), Catalyzes protein synthesis (No), Receives signals for DNA replication (Yes)

Tags

NGSS.HS-LS1-3

A type of cellular transport is shown. Which description best identifies this type of cellular transport?

• Active transport, because energy is being used to move molecules against the concentration gradient

• Facilitated diffusion, because energy is being used to move molecules with the concentration gradient

• Osmosis, because energy is not being used to move molecules with the concentration gradient

• Endocytosis, because energy is not being used to move molecules against the concentration gradient