93' SBIOA Exam
Part A: M/C
Part B: Short Answers
Part C: Essay Question
C: CALCULATIONS AND ESSAY
ANSWERS (about 10 minutes each)
Answer these on the fullscap pages provided.
You should use no more than 3/4 of a page per question.
A food pyramid goes is found to be:
bacteria -> protozoa -> -> zebra mussels -> turtles
A one hundred gram turtle needs 2000 kJ of energy each day.
How many kJ/day would a population of 500 turtles need?
Assuming an energy transfer of rate of 10%, how many kJ of
bacteria are needed each day to support the population of 500 turtles?
Where does the other 90% of the energy go?
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?
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.
How many zebra mussels ought there be in 2 years (24 months)?
Show all relevant elements to your solution.
In 2 years, only 4 000 zebra mussels are found.
Give four five different reasons why this may be so.
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.
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.)
Other than carbon, oxygen and hydrogen, what other substances
will need to be taken into the plant in order to make those classes of
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..
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.
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.
"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.