When a polypeptide is being assembled, the bond that forms between a newly added amino acid and the previous amino acid in the chain is a ________ bond.

_______________________ epithelium provides a moist and slippery surface and is well suited to resist stree, as in the ____________________.

21. What is the net movement of substances to regions of lower concentration called?  

39. Membrane fluidity is affected by  

_______________ is the study of form.

40. THINK: Incubation of cells at 20°C blocks the release of proteins from the trans-Golgi. Under such conditions, you would expect to see  

The sequence of nucleotides in a DNA molecule is called the ________ code.

13. In eukaryotes, mitochondria are the organelles primarily involved in:  

26. Membrane proteins that are very soluble in water are known as _____________________ .

36. Facilitated diffusion is an important method for cells in obtaining necessary molecules and removing other ones. Requirements for facilitated diffusion include