Biology 12th Edition

Published by McGraw-Hill Education
ISBN 10: 0-07802-426-9
ISBN 13: 978-0-07802-426-9

Chapter 1 - A View of Life - Engage - Thinking Scientifically - Page 17: 1


Observations- A. When dye is spilled on a culture plate containing bacteria, the bacteria survive despite being exposed to sunlight (UV light). Hypothesis- B. The dye may have a protective effect on the bacteria against UV light. Experiments and/or observations- C. Two plates are evaluated. One culture plate contains bacteria and dye and the second culture plate, the control, contains only bacteria. Both plates are exposed to a UV light source. The bacteria on both culture plates die. Conclusions: D. The dye does not provide a protective effect for bacteria against UV light.

Work Step by Step

The observation is what the scientist saw that caused him to develop a prediction about something (he saw the plate of bacteria with the dye survive exposure to UV light). The hypothesis is the prediction that the scientist is trying to prove (the dye protects the bacteria from UV light). The experiment puts the hypothesis to the test (expose the bacteria to dye and UV light again and see what happens. Add a control of bacteria and no UV light for comparison). The conclusion of the experiment is what was learned from it (the dye had no protective effect on the bacteria).
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