Using Scientific Methodology

Question 1 of 4

Animation 1.1 Quiz

During the laboratory investigation of the effects of heat on corals, four coral samples were exposed to conditions according to the scheme shown below.

Which samples represent controls in this experiment?

Samples labeled with an “I”

Samples labeled with an “II”

Samples labeled with an “A”

Samples labeled with a “B”

Correct. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Incorrect. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Animation 1.1 Quiz

Suppose the researchers locate a colony of coral established in a natural setting, and begin collecting data on the percentage bleaching in the colony at regular time intervals. They observe that the percentage bleaching increases just after the water temperatures are observed to rise dramatically. How would this investigation be classified?

Comparative experiment

Controlled experiment

Variable experiment

Predictive experiment

Correct. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Incorrect. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Animation 1.1 Quiz

The bar graph below shows results from the laboratory experiment comparing the resistance to bleaching at high temperatures by cool-pool corals versus warm-pool corals.

In this experiment, researchers ran a statistical test to determine the significance of the results. The test gave a p value of 0.001%. Suppose, however, that the test had given a p value of 50% instead. How would such a result have affected the conclusions that were drawn?

The investigators would have rejected the null hypothesis and concluded that cool-pool and warm-pool corals had the same reaction to high temperatures.

The investigators would have rejected the null hypothesis and concluded that cool-pool and warm-pool corals had different reactions to high temperatures.

The investigators would not be able to reject the null hypothesis and would conclude that cool-pool and warm-pool corals definitely had the same reaction to high temperatures.

The investigators would not be able to reject the null hypothesis and would conclude that cool-pool and warm-pool corals could possibly have had the same reaction to high temperatures.

Correct. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Incorrect. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Animation 1.1 Quiz

The researchers continued another round of experiments in which they tested cool-pool corals for their ability to acclimatize to higher temperatures. They found that cool-pool corals could resist bleaching after prolonged exposure to warm temperatures. Which is a new question that could be posed based on this information that would carry the investigation to the next level?

Which genes are present in warm-pool corals, but absent in cool-pool corals?

Which genes are expressed in warm-pool corals, but not expressed in cool-pool corals?

How does changing other environmental conditions such as pH or salt concentration affect bleaching of cool-pool corals?

How do warm-pool corals change when placed in environments with cool temperatures?

Correct. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

Incorrect. See Key Concept 1.2 Biologists Investigate Life through Experiments That Test Hypotheses

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Chapter . Using Scientific Methodology