Oxygen gas (O2) crosses cell membranes via simple diffusion. Why?

How do yeasts or lactic acid bacteria cause spoilage in wine?

Which of the following occur during termination of transcription?

Briefly explain why surface area-to-volume ratio is important for cell function.

What are duplications, with respect to chromosomal mutations?

What do receptor antagonists do?

What is the function of NADH? 

Boron atoms have an atomic number of 5. Based on this information, which of the following statements is correct?

In the image below, the orange molecules cannot cross a semipermeable membrane. The yellow circle represents an animal cell that has just been placed in the beaker. The blue liquid is water. What will happen to the animal cell?  

In the beaker shown below, the purple molecules cannot cross the membrane. The pink is dyed water. What will happen next?