Question

1. which of the following is an example of active transport in animal cells? a) simple diffusion of ions b) facilitated diffusion of glucose c) passive transport of oxygen d) sodium - potassium pump activity 7. in the sodium - potassium pump, how many sodium ions are transported out of the cell for every two potassium ions transported into the cell? a) 3 sodium ions out, 2 potassium ions in b) 2 sodium ions out, 1 potassium ion in c) 1 sodium ion out, 1 potassium ion in d) 1 sodium ion out, 2 potassium ions in 8. what is the primary source of energy for active transport processes in cells? a) oxygen b) glucose c) adenosine triphosphate (atp) d) carbon dioxide 9. which transport mechanism is responsible for maintaining the resting membrane potential of nerve and muscle cells? a) facilitated diffusion b) simple diffusion c) active transport d) sodium - potassium pump 10. the fluid mosaic model describes the structure of the cell membrane, highlighting the presence of: a) a rigid and unchanging lipid bilayer b) a static arrangement of integral proteins c) a dynamic and flexible lipid - protein mosaic d) a complete absence of proteins

Explanation:

• Question 6: Active transport requires energy. The sodium - potassium pump uses energy to move ions against their concentration gradient, while simple diffusion, facilitated diffusion, and passive transport of oxygen are passive processes.
• Question 7: The sodium - potassium pump transports 3 sodium ions out of the cell and 2 potassium ions into the cell per cycle.
• Question 8: ATP is the primary energy - currency of the cell and provides energy for active transport processes.
• Question 9: The sodium - potassium pump maintains the resting membrane potential of nerve and muscle cells by establishing ion gradients.
• Question 10: The fluid mosaic model describes the cell membrane as a dynamic and flexible structure composed of a lipid - protein mosaic.

Answer:

1. d) Sodium - potassium pump activity
2. a) 3 sodium ions out, 2 potassium ions in
3. c) Adenosine triphosphate (ATP)
4. d) Sodium - potassium pump
5. c) A dynamic and flexible lipid - protein mosaic