Why can oxygen diffuse across a cell membrane but a protien cannot?
a. oxygen is polar unlike proteins
b. proteins asre blocked by protien channels
c. proteins are smaller than oxygen
d. oxygen is smaller than proteins

If you were given a map of the sensory cortex in the postcentral gyrus of the cerebrum, do you think the map would have more “space” devoted to the regions of the body that have the highest density of sensory receptors, or the regions of the body that have the lowest density of sensory receptors? explain

Which class of molecules contains the amino group, nh2 (a) sugars (b) water (c) proteins (d) hydrocarbons

The body of water found at number 4 on the map above is the