Back to the full dot-point answer
SingaporeBiologyQuick questions
Cell Biology
Quick questions on Transport across cell membranes: H2 Biology Cell Biology
4short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is active transport (energy required)?Show answer
Active transport moves a substance against its concentration gradient using a carrier protein that acts as a pump. The carrier hydrolyses ATP, changes shape, and carries the substance from low to high concentration. This is how cells maintain steep gradients, such as the sodium-potassium pump.
What is q1?Show answer
State whether osmosis is an active or a passive process and give a reason. [1 mark]
What is q2?Show answer
Explain why oxygen can cross the phospholipid bilayer by simple diffusion but glucose cannot. [2 marks]
What is q3?Show answer
Describe how a white blood cell uses endocytosis to engulf a bacterium. [2 marks]
Have a question we have not covered?
This dot-point answer is short enough that we have not extracted many short questions yet. Read the full dot-point answer or ask Mo, our study assistant, in the chat for follow ups.