97' SBIOA Exam

1.                  A calorimeter which is 20% efficient had 100 g of water go from 20 °C to 60 °C.  In doing so, a peanut lost 2 g of biomass.  Two grams of peanut represents 0.01 of a mole of the biomass.  What is the theoretical heat of reaction for the peanut?

2.                  In March 1997 off Canada’s west coast, 5 teams of biologists each caught and tagged 4000 salmon for a total of 20,000 tagged salmon. They then released the fish in the Juan de Fuca Strait.  After 2 months had gone by, the 5 teams went back to the same spots and each recaptured 1000 salmon.  The results are shown in

Team Leader                                                         Number of fish of the 1000 recaptured which were   tagged.

Joel “Mad Dog” Moran                                                     180

Tran “The Beast” Thompson                                              210

Craig “Arrrh Matey” Lising                                                220

Danielle “The Nutbar” Vander Loonie                                200

Tony “Slick” Elias                                                              190

a)                  Estimate the population of salmon.

b)                 Comment on the truthfulness or validity of the calculation.

3.                  Use an analogy of a car’s accelerator and brake pedal to describe either the lac or trp operon or the CAP repressor.  Make sure to describe what turns on and off the genes, whether the gene is normally on, etc. 

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