M4 Post

Which of the following is not true of passive transport?

• Molecules move from high to low concentrations

• Osmosis is a type of passive transport.

  
  

• Passive transport requires energy in the form of ATP.

  
  

Based on the concept of passive transport, what happens after a candle is lit in a room?

• Molecules from the candle create scent throughout the room by spreading from the candle to areas of lower concentration.

  
  

• The energy from the candle pushes molecules from the candle to areas of higher concentration in the room.

  
  

• The candle burns air molecules in the room, replacing those molecules with molecules from the candle.

  
  

Osmosis is the diffusion of what substance?

• Oxygen

• Water

• Salt

An organism works to maintain a state of optimum (best) conditions at all times. This balance is known as _____.

• Osmosis

• Homeostasis

• Diffusion

The part of the cell that controls what enters and leaves the cell is the ___.

• Nucleus

• Ribosomes

• Plasma Membrane

A freshwater plant is placed in a container of saltwater. What will most likely happen to the cells of the plant?

• They will swell because the water will move into them.

  
  

• They will swell because the salt will move into them.

  
  

• They will shrink because the water will move out of them.

  
  

A person with swollen gums rinses her mouth with warm salt water, and the swelling decreases. Which of the following has occurred?

• The swollen gums have absorbed the saltwater solution.

  
  

• The saltwater solution lowers the temperature in the gums.

  
  

• The water in the cells of the gums has moved out due to a lower concentration of water in the saltwater solution.

  
  

If energy is needed to move materials into or out of a cell, what is most likely occurring?

• Active transport

• Passive transport

• Osmosis

Which of the following would be true of active transport, but not true of passive transport?

• Materials are moved either into or out of the cell.

  
  

• Movement of materials occurs across the plasma membrane.

  
  

• Cellular energy is used to move the materials.

  
  

Shivering to warm up and sweating to cool down are examples of which of the following?

• Cellular Respiration

• Transport

• Homeostasis