3. PLEASE SHOW ALL WORK!!! You have been given a large sum of funds from the cit

Question

3. PLEASE SHOW ALL WORK!!! You have been given a large sum of funds from the city of Chicago to come up with a way to rid Lake Michigan of Zebra mussels. Through your studies, you have discovered a new biochemical pathway! The pathway is depicted below (3.0 pts).

Waterase               shorase            Sandase

WATER ----------> SHORE ----------> SAND ----------> BEACH

In this pathway, the precursor WATER is taken up by Zebra mussels and is converted to the final product BEACH. WATER is converted to SHORE by the enzyme, waterase. The enzyme, shorase, then converts SHORE to SAND and the final enzyme in the pathway, sandase, converts SAND to BEACH. Zebra mussels that have a ‘loss-of-function mutation’ (lf) for the genes that encode either waterase, shorase or sandase cannot convert WATER to BEACH and cannot survive on WATER alone, whereas normal Zebra mussels can survive with only WATER. Decide if the following statements are true or false and explain your decision (1.0 pts).

Zebra mussels mutant (lf) for waterase can survive if given the intermediate SHORE.

Zebra mussels mutant (lf) for shorase can survive if given the intermediate SHORE.

C. Zebra mussels that are mutant (lf) for both waterase and sandase can survive if given the intermediate SAND.

Explanation / Answer

Zebra mussels mutant (lf) type are the one which can survive with the presence of either Shore, sand or beach and cannot survive with water alone.

1. Zebra mussels mutant (lf) for waterase can survive if given the intermediate SHORE. (TRUE)

In the given case in Zebra mussels, mutation occured in waterase enzyme which convert water to shore. As the mussel cannot survive alone with presence of water die. But shore is supplied as an intermediate that converts to sand by shorase and sand to beach by sandase. So the mussel survives when given shore.

2. Zebra mussels mutant (lf) for shorase can survive if given the intermediate SHORE. False

In the given case in Zebra mussels, mutation occured in shorase enzyme which convert shore to sand. Mussel contain waterase that converts water to shore. Even in presence of shore, shore is supplied as an intermediate that cannot convert to sand as shorase enzyme is mutated.. Ultimately. shore gets accumulated in the mussel making the organism difficult to survive.

3. Zebra mussels that are mutant (lf) for both waterase and sandase can survive if given the intermediate SAND. (True)

In the given case in Zebra mussels, mutation occured in waterase and sandase enzymes which convert water to shore and sand to beach respectively. So, mussel ceases formation of shore, sand and beach. The supply of mussel with sand alone makes the mussel to survive

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