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BIOB34H3 Study Guide - Midterm Guide: Toronto Zoo, Reactive Oxygen Species, MacromoleculeExam

Biological Sciences
Course Code
Jason Brown
Study Guide

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BIOB34 Term Test 1
Practice Session Facilitator: Hassan Alibhai
Application-Style Practice Problems
1. As Mancie the Mouse was running around in Highland Creek, her left paw
suffered a cut and numerous biological macromolecules leeched out of her
bloodstream. At the same time, Bertie the Bird was flying in the trees above
and was scraped by a branch, once again releasing various biological
macromolecules. A radioisotope tracker was added to Mancie and Bertie, and
both animals were treated, and then captured and observed over many years
by the Toronto Zoo, which was luckily close by. Which choice most likely
correlates with the zoo’s observations regarding Mancie and Bertie’s lives?
A. Manice lives longer than Bertie
B. Manice is able to produce healthier offspring when compared to
Bertie’s offspring
C. Bertie lives longer than Mancie
D. Bertie is able to produce healthier offspring when compared to
Mancie’s offspring
E. Bertie and Mancie will likely have similar lifespans.
Answer: The key here is that the two animals live in the zoo, and so
predation is a factor for neither. According to the Mitochondrial Oxidative
Theory of Aging, the animal that will age faster will be the animal that
produces more reactive oxygen species, by way of using ATP. Because the
predation is a factor for neither, both can dedicate all their energy to
macromolecule repair, and so neither lifespan will be longer. For the same
reason, we are unable to make a statement regarding offspring calibre as its
impossible to dictate which animal dedicates more energy to reproduction. In
this case, the correct response is (E).
Trick: Ignore the instinct to select the bird as the animal having the higher
lifespan, and read the whole question the lack of predation eliminates any
type of competition as a factor, and so lifespan may not actually change.
Fall 2019 Page 1
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