Ch.3 Sect 4 Cell in Its Environment / Ch 3 Review

Means that some substances can pass through the membrane while others cannot. Cells must let certain things enter and leave.

• Active transport

• Diffusion

• Osmosis

• Passive transport

• Selectively permeable

The process by which molecules move from an area of higher concentration to an area of lower concentration. This is the main method in which small molecules move across the cell membrane.

• Active transport

• Diffusion

• Osmosis

• Passive transport

• Selectively permeable

The diffusion of water through a selectively permeable membrane.

• Active transport

• Diffusion

• Osmosis

• Passive transport

• Selectively permeable

The movement of dissolved materials through a cell membrane without using cellular energy.

• Active transport

• Diffusion

• Osmosis

• Passive transport

• Selectively permeable

The movement of materials through a cell membrane by using cellular energy.

• Active transport

• Diffusion

• Osmosis

• Passive transport

• Selectively permeable

Starch is an example of a:

• Nucleic acid

• Protein

• Lipid

• Carbohydrate

The process by which water moves across a cell membrane is called:

• Osmosis

• Active transport

• Organelle

• Resolution

Saliva in your mouth is an example of an enzyme because:

• It is the building blocks of proteins

• It provides an energy source for your cells.

• It speeds up the breakdown of starches.

• It makes up most of the cell membrane.

Oxygen molecules enter a cell by diffusion, which is:

• The diffusion of water through a selectively permeable membrane.

• The movement of dissolved materials through a cell membrane without using cellular energy.

  
  

• The movement of materials through a cell membrane by using cellular energy.

• The process by which molecules move from an area of higher concentration to an area of lower concentration.