Question

1.The following amino acids present a free hydroxyl group when incorporated into peptide, Except. a. Serine b. Tyrosine c. Threonine d. Alanine e. All have free hydroxyl groups.

2.When adenyl cyclase gets converted to cAMP, a signal cascade ensues. What is used to break down cAMP to stop this amplification? a. phosphodiesterase b. phosphorylase kinase c. phosphorylase d. protein kinase A e. theophylline

3.. Which of the following is the correct description of a caspase? a. One of a series of enzymes involved in a cascade of reactions as part of apoptosis involves the cleavage of cysteine sites

b. Part of a series of enzymes involved in apoptosis that involves the cleavage of valine sites

c. Part of a series of organized enzymes involved in the progression of cancer that involves the cleavage of cysteine sites

d. Part of a series of organized enzymes that involves the progression of cancer that involves the cleavage of tyrosine sites

e. A protease that cleaves adjacent to lysine or arginine residues

4.The following statements about the wnt system are correct EXCEPT: a. the wnt pathway uses kinases b. frizzled can act as a receptor for wnt c. frizzled can activate disheveled d. wnt signaling always includes B-catenin e. all of the above