cell diffusion 3

Cells need to bring in molecules to carry out cellular processes. Often, this requires moving the molecules across the cell membrane against the concentration gradient. How do these molecules get into the cell?

• passive transport by diffusion
• active transport using ATP 
• passive transport by osmosis
•  osmosis

A person with swollen gums rinses his 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 of the water in the gums.
• The salt in the solution has moved against the concentration gradient.
• The water in the gums has moved out due to the high concentration of salt in the solution. 

Tags

NGSS.MS-PS1-2

The cell membrane of the red blood cell will allow water, oxygen, and carbon dioxide to pass through. Because other substances are blocked from entering, this membrane is called

• perforated
• semi-permeable
• non-conducive
• permeable

Tags

NGSS.MS-LS1-2

 Look at the diagram of a cross-section of a cell membrane below. The cell membrane controls movement of materials into and out of the cell. The following particles are moving from high concentration to low concentration and are using a carrier protein. How would you describe this type of movement across the membrane? 

• simple osmosis
• active transport
• simple diffusion
• facilitated diffusion

Tags

NGSS.MS-LS1-2

Identify the cellular structure that diffusion occurs across.

• ribosome

• mitochondria

• cytoplasm

• cell membrane

• chloroplast

Identify the cellular structure that is mostly water and is the jelly-like fluid in the cell.

• ribosome

• mitochondria

• cytoplasm

• cell membrane

• chloroplast

Tags

NGSS.MS-LS1-2

Describe diffusion:

• the movement of molecules higher concentration to an area of lower concentration

• the synthesis of molecules higher concentration to an area of lower concentration

• the movement of molecules lower concentration to an area of higher concentration

• the synthesis of molecules lower concentration to an area of higher concentration

Identify the substance/molecule that will not diffuse.

• Starch

• Glucose

• Iodine

Tags

NGSS.MS-PS1-2

Identify the substance(s)/molecule(s) that will diffuse.

• Starch

• Glucose

• Iodine

Tags

NGSS.MS-PS1-2

Select the four organic macromolecules.

• nucleic acids

• proteins

• lipids

• amino acids

• carbohydrates