21. Which amino acid would you find most likely in an integral protein embedded in the plasma membrane?(A)serine(B)arginine(C)glutamine(D)leucine

6. Which one of the following statements is true about catabolic pathways?(A)They combine molecules into more complex and energy-rich molecules.(B)They belong to the reduction reaction.(C)They are usually coupled with anabolic pathways and generate energy in the form of ATP.(D)They do not need enzyme catalysts.