The activity of chymotrypsin changes as the pH changes in the range of pH 5-9. a. What amino acid functional group on which type of residue, is the most likely to be responsible for the effect of pH?
b. What is the apparent pKa?
c. Explain in terms of chymotrypsin mechanism why the activity increases as the pH increases in this pH range.

Using freezing point depression to find molecular weight lab report

Which statement about dna replication is true? a. eukaryotes only have one circular chromosome that unwinds at multiple locations. b. eukaryotes can only replicate one segment of a chromosome at a time. c. prokaryotes can only replicate their single circular chromosome in the nucleus. d. prokaryotes only have one origin of replication to initiate replication.

What sentence best supports the statement that hormones are involved in the regulation of homeostasis? a. the hormone erythropoeitin increases the production of red blood cells when oxygen levels are low. b. the hormone oxytocin promotes labor contractions of the uterus during childbirth. c. the hormone melatonin induces sleep and its production is slowed by exposure to light. d. the hormone cortisol suppresses the immune system and is produced when the body is under stress.