1. Which of the following would result in the greatest decrease in function of t

Question

1. Which of the following would result in the greatest decrease in function of the catalytic triad found in sereine proteases?

a. mutation to ser, cys, asp

b. mutation to ser, his, asp

c. mutation to cys, his, asp

d. mutation to ser, his, glu

e. mutation to cys, his, glu

2. Give an example of secondary active transport and explain its mechanism in details.

3. Signals carried by hormones must eventually be terminated; the response continues only for a limited time. Discuss four different mechanisms for signal termination, using specific systems as examples.

Explanation / Answer

1. b. mutation to ser, his, asp.

2. secondary active transport --- it is called coupled transport , energy is used to transport molecule across a membrane . It relies upon the electrochemical potential difference created by pumping ions in and out of cell --- permitting one ion or molecule to move down an electrochemical gradient , but possibly against the concentration gradient where it is more concentrated to that where it is less concentrated.

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