3. When substances cross cell membranes by simple diffusion, they a. squeeze between phospholipid molecules.
b. have help from channel proteins.
C. move from a higher to lower concentration.
d. two of the above

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

What are the primary responsibilities of a chemical engineer involved in "r& d"? develop large scale manufacturing operations discover new products and processes training of new chemists determine products needed by consumers

If two objects at different te,peraure are in contact with each other what happens to their temperature