ACT Science Quiz 3
You will be given two science passages, one with 7 questions and one with 6 questions, for a total of 13 questions.
Data Representation (1 of 7)

Use this passage to answer the next 7 questions:

The bacterial strain SN2 (Alteromonas naphthalenivorans) is known to contaminate both tidal flats and seawater. The graphs in Figure 1 show the results of an experiment intended to measure the cell growth of SN2 in a tidal flat environment with added Naphthalene (TF-N) and a tidal flat environment with added Pyruvate (TF-P). The concentration of Naphthalene and Pyruvate were also measured within this experiment. Additionally, changes in the optical density of seawater was measured when both Naphthalene and Pyruvate were added. The goal of this experiment was to better understand the Eco physiological behavior of SN2 in contaminated environments. The graphs in Figure 2 depict levels of correlation in level of gene expression between conditions. 

data representation 2

Figure 1

data representation 3

Figure 2

Figures adapted from Genome-wide transcriptional responses of Alteromonas naphthalenivorans SN2 to contaminated seawater and marine tidal flat sediment by Hyun mi Jin et al.

1. In Figure 1, what is the relationship between Pyruvate concentration and Naphthalene concentration?

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Some questions are from the following sources:

Erik Jacobsen at

From the New York State Education Department. "High School Regents Examinations". Internet. Available from; accessed 8/29/2011.
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