Some regions of a polypeptide may coil or fold back on themselves. this is called and the coils or folds are held in place by
a. tertiary structure covalent bonds
b. primary structure covalent bonds
c. tertiary structure hydrogen bonds
d. secondary structure hydrogen bonds
e. secondary structure peptide bonds

What statements describe a host organism?

The many stone tools, fragmentary animal bones, and teeth found at gran dolina, spain, indicate that hominids there? a. processed and consumed animals and other hominids. b. did not differ appreciably from earlier asian homo erectus. c. were similar to later homo sapiens. d. none of the above

Imagine a self-reactive t cell that has not undergone clonal deletion in the thymus (that is to say, it has escaped central tolerance). if it encounters self antigen in the absence of an infection or inflammation, what will happen to this self-reactive t cell? (select two answers) (a) the t cell undergoes clonal expansion. (b) the t cell gains effector functions. (c) the t cell undergoes apoptosis. (d) the t cell becomes activated. (e) the t cell becomes anergic.