Exam 5: The Working Cell

Water that is filtered out of the blood by the kidneys is returned to the body through the action of aquaporins. Which of the following statements about water balance disorders is scientifically accurate?

White blood cells (WBCs) are more resistant to lysis than red blood cells (RBCs). When looking at a sample of blood for WBCs, what could you do to reduce interference from RBCs?

A child is brought to the hospital with a fever of 107°F. Doctors immediately order an ice bath to lower the child's temperature. Which of the following statements offers the most logical explanation for this action?

A plant cell in a hypotonic solution

You are adrift in the Atlantic Ocean and, being thirsty, drink the surrounding seawater. As a result

A steer must eat at least 100 pounds of grain to gain less than 10 pounds of muscle tissue. This illustrates

Aspirin and other nonsteroidal anti-inflammatory drugs (NSAID) inhibit inflammation by inhibiting an enzyme in the prostaglandin pathway. However, inhibiting this enzyme also inhibits other pathways that protect the stomach from damage by stomach acid and that form blood clots. What can you conclude from this?

Plasma membranes are selectively permeable. This means that

Which of the following statements regarding membrane function is false?

Oxygen crosses a plasma membrane by

The fluid mosaic model describes the plasma membrane as consisting of

When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction.

Which of the following statements is true for all types of passive transport?

If you were working for a pharmaceutical company as part of a drug discovery team, which of these enzyme inhibitors would you suggest as a productive avenue for drug development?

When two aqueous solutions that differ in solute concentration are placed on either side of a semipermeable membrane and osmosis is allowed to take place, the water will

Which of the following statements regarding thermodynamics is false?

If you shut off the system and pressure was no longer applied to tank A, you would expect the

Americans spend up to $100 billion annually for bottled water (41 billion gallons). The only beverages with higher sales are carbonated soft drinks. Recent news stories have highlighted the fact that most bottled water comes from municipal water supplies (the same source as your tap water), although it may undergo an extra purification step called reverse osmosis. Imagine two tanks that are separated by a membrane that is permeable to water, but not to the dissolved minerals present in the water. Tank A contains tap water and tank B contains the purified water. In the reverse osmosis process, pressure is applied to the tap water tank to force the water molecules across the membrane into the pure water tank. -After the reverse osmosis system has been operating for 30 minutes, the solution in tank A would

ATP can be used as the cell's energy exchange mechanism because

Which of the following is a typical feature of an ATP-driven active transport mechanism?