Unit 3 Review

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

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

Which activity can occur without the use of energy?

• contraction of muscle tissue
• protein synthesis in a cell
• active transport of minerals
• movement of water across a membrane

The diffusion of water across a selectively permeable membrane is called 

• active transport
• facilitated diffusion
• osmosis
• phagocytosis

During diffusion molecules tend to move 

•    up the concentration gradient
•  from an area of lower concentration to an area of higher concentration
•  in a direction that doesn’t depend on concentration
•  down the concentration gradient

Osmosis is a form of ______________. 

• Passive Transport
• Active Transport

Solutes move against the concentration gradient, therefore energy is needed. 

• Passive Transport
• Active Transport

This cell structure helps organisms maintain homeostasis by controlling what substances may enter or leave cells.

• vacuole
• nucleus
• cell membrane
• cell wall

Tags

NGSS.HS-LS1-3

The cell below is in a _________ solution.

• Hypotonic
• Hypertonic
• Isotonic

Tags

NGSS.HS-LS1-3