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Exam 1: The Science of Biology

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Question 31

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Imagine that a researcher for a large food company believes that he has developed a new drug that increases appetite. He names the drug "EatMore" and designs an experiment to test his hypothesis. He uses two groups of mice: one group is given the drug and the other group given a placebo sugar pill. The appetite levels are assessed by measuring the amount of food consumed by the mice in each group for one week. At the end of the experiment, he reported that on average, mice that received the "EatMore" drug consumed 2.5g of food/day and mice that received the placebo consumed 5g of food/day. Statistical analysis of the data showed the difference to be statistically significant. Match the following terms with the conditions related to the accompanying experiment. -the mice that received the "EatMore" drug

A) independent variable
B) dependent variable
C) experimental group
D) control group

E) All of the above
F) A) and B)

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Question 32

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A scientist randomly divided a group of 100 lab rats into two groups of 50. One group was fed regular rat chow while the other was fed the same amount of rat chow with added DDT. Both groups were housed in the same room with the same environmental conditions. At the end of the experiment, rats were weighed and the mean difference calculated. -Refer to the accompanying narrative. Which variable(s) were manipulated by the scientist?

A) DDT only
B) temperature only
C) weight differences only
D) both DDT and weight differences
E) both temperature and weight differences

F) B) and C)
G) D) and E)

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Question 33

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Imagine that a researcher for a large food company believes that he has developed a new drug that increases appetite. He names the drug "EatMore" and designs an experiment to test his hypothesis. He uses two groups of mice: one group is given the drug and the other group given a placebo sugar pill. The appetite levels are assessed by measuring the amount of food consumed by the mice in each group for one week. At the end of the experiment, he reported that on average, mice that received the "EatMore" drug consumed 2.5g of food/day and mice that received the placebo consumed 5g of food/day. Statistical analysis of the data showed the difference to be statistically significant. Match the following terms with the conditions related to the accompanying experiment. -the mice that received the placebo

Imagine that a researcher for a large food company believes that he has developed a new drug that increases appetite. He names the drug "EatMore" and designs an experiment to test his hypothesis. He uses two groups of mice: one group is given the drug and the other group given a placebo sugar pill. The appetite levels are assessed by measuring the amount of food consumed by the mice in each group for one week. At the end of the experiment, he reported that on average, mice that received the "EatMore" drug consumed 2.5g of food/day and mice that received the placebo consumed 5g of food/day. Statistical analysis of the data showed the difference to be statistically significant. Match the following terms with the conditions related to the accompanying experiment. -the amount of food consumed

Match the following terms with the appropriate description. -smallest unit of life

Critical thinking is the process of ____.

The transmission of DNA to offspring is known as ____.​

Match the terms with the most suitable description. -hypothesis

Plants use energy from the sun to produce nutrients; therefore, plants are _____.

Match the statement to the most appropriate function, process, or trait listed below. -increase in cell size, number, and volume

Match the terms with the most suitable description. -prediction

Match the following terms with the appropriate description. -arctic foxes, polar bears, fish, mosses, and shrubs (all species in the arctic tundra)

In the experiment with peacock butterflies, researchers noticed that the butterflies folded their wings and made hisses and clicks in the presence of bird predators. They therefore hypothesized that these behaviors helped the butterflies escape predation. Next, they predicted that removal of the spots on the butterfly's wings and/or removal of the ability of the butterfly to hiss and click will result in a greater risk of predation. To arrive at the hypothesis, the researchers used ____, while developing the prediction used ____.

In order to reduce bias and subjectivity, scientists perform experiments that yield ____ results.

Match the following terms with the appropriate description. -circulatory system of polar bears

Energy flows ____ in an ecosystem.

A hypothesis that has been repeatedly and rigorously tested and supported is known as a _____.

Match the following terms with the appropriate description. -?the fat layer under a polar bear's skin

In an experiment, the experimental group is _____.

Four of the five answers listed below are kingdoms into which living organisms are classified. Select the exception.