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93' SBIOA Exam


93 Exam 
Part A: M/C
Part B: Short Answers
Part C: Essay Question

94 Exam 
Part A: M/C
Part B: Essay Questions

95 Exam 
Part A: M/C
Part B:
Part C:
Part D:

97 Exam 
Part A: M/C
Part B:
Part C:
Part D:








Answer these on the fullscap pages provided.  You should use no more than 3/4 of a page per question.


1 .     A food pyramid goes is found to be:

                         bacteria -> protozoa -> -> zebra mussels -> turtles


            a .          A one hundred gram turtle needs 2000 kJ of energy each day.  How many kJ/day would a population of 500 turtles need?


            b .          Assuming an energy transfer of rate of 10%, how many kJ of bacteria are needed each day to support the population of 500 turtles?


            c .          Where does the other 90% of the energy go?


            d .          One m3 of water contains 1/20th of a kJ worth of bacteria.  How many m3 of water is needed to keep this population of turtles alive?



2 .   The population of zebra mussels in a certain lake is currently 1 000.  They are breeding at a rate of increase of 12% per month.


            a .          How many zebra mussels ought there be in 2 years (24 months)?  Show all relevant elements to your solution.


            b .          In 2 years, only 4 000 zebra mussels are found.  Give four five different reasons why this may be so.



3 .         The plankton upon which the flagellates, mussels and turtles depend are photosynthetic organisms.  Sketch and label both of the biochemical pathways involved in creating carbonaceous food and oxygen gas which these organisms perform.



4 .        a .          List 6 different classes of compounds which the plants also make.  (Note:  "Proteins" would be called a "class", since amino acids are part of the larger group  Yes Greg, "proteins" is one of the answers, and no you can't use it again.)


            b .          Other than carbon, oxygen and hydrogen, what other substances will need to be taken into the plant in order to make those classes of compounds?



5 .         A zebra mussles cell's "E.T.C." is found to produce only 2 ATP's from each NADH and only 1 ATP from each FADH.  How many ATP's in total will be made from 12 moles of pyruvate?  In solving this question, sketch the Krebs, and the E.T.C..



6 .        Shell softness in zebra mussels is controlled by a three allele, simple dominant and recessive system.  The usual symbols used to denote the genetics are:  "A" for normal, "α for super-hard, and "a" for very soft.  In the lake being studied, the data shows that 4% of the population have normal shells, and nine percent have super-hard shells.  Can you find the percentage of the population which has the genotype "αa"?  Show how you can or why you can't.



7 .        It has been discovered that 2 500 000 years ago, the spotted mussels and the striped zebra mussel did not exist - but there was a mussel which had blotches which were sort of in-between the spots and stripes.  With the aid of Punnett diagrams, explain what happened, and offer four different possible reasons why the gene pool changed.  For each reason, use the words "gene pool, allele, and any others to explain your reasoning.



8 .        "One day soon, the gene for cancer will be discovered.  Shortly after that "cancer" will be cured."


            This statement is often claimed by the media - but never by knowledgable geneticists.  Including the ideas of gene products and regulation of genes, write a short reply and try to give the poor media person a dose of reality.


  <-Part B   ---  The End of 93 Exam ---   94 Exam->