Some molecules are too big they cannot diffuse through the membrane, for example starch (glucose) molecules.
Most likely A only because your respiratory system needs oxygen
Answer:
2-(hydroxymethyl)-1, 3-oxathiolan-5-yl group.
Explanation:
2-(hydroxymethyl)-1,3-oxathiolan-5-yl group is a functional group of Emtricitabine. Emtricitabine is an antiviral medicine that treat human immunodeficiency virus (HIV) disease by preventing multiplication in your body. Emtricitabine comprise of organofluorine compound in which 5-fluorocytosine is substituted at the 1st position by a 2-(hydroxymethyl)-1,3-oxathiolan-5-yl group.
