Chap 3 Biology

Which of the transport occurs against the concentration gradient?

• A. Passive transport

• B. Simple diffusion

• C. Facilitated diffusion

• D. Active transport

Simple diffusion, osmosis and facilitated diffusion involve the movement of molecules from high concentrated area to low concentrated area until a ___________ is achieved.

Exchange of carbon dioxide and oxygen between alveolus and blood capillary through ____________

• A. Osmosis

• B. Simple diffusion

• C. Facilitated diffusion

• D. Active transport

Osmosis is the movement of water molecules from ________ area to ________ area until a dynamic equilibrium is achieved.

Glucose molecules move across the plasma membrane with the help of carrier proteins and energy is not required. This process is called ________

• A. Simple diffusion

• B. Facilitated diffusion

• C. Active transport

The term 'down the concentration gradient' means the movement of substances from low concentrated area to high concentrated area.

• TRUE

• FALSE

Channel proteins changes their shape to allow small - sized solutes and ions to diffuse from high concentrated area to low concentrated area across the plasma membrane.

• TRUE

• FALSE

Which of the following is FALSE about active transport?

• A. Requires energy in the form of ATP

• B. Results in accumulation or excretion of molecules or ions in the cell

• C. Transport substances down the concentration gradient

• D. Helps root hairs absorb mineral ions from the soil

Which of the following are transported across plasma membrane by facilitated diffusion?

• ions

• amino acid

• fatty acids

• glucose

In sodium-potassium pump, ___ Na+ ions are transported out of the cell and ___K+ ions are transported into the cell.

• A. 2, 3

• B. 3,2

• C. 2,2

• D. 3,3