Exam 1: Biology: Exploring Life

After reading the paragraph below, answer the questions that follow. Researchers set up a study to determine whether large doses of a nutritional supplement would shorten the length of time it takes to recover from a cold. Three thousand volunteers were split into two groups. For two weeks, members of group A took 3,000 mg of the supplement daily. Group B received 3,000 mg of a placebo. At the end of the two-week period, the researchers inserted live cold viruses directly into the noses of all the volunteers. The volunteers in both group A and group B continued to take their daily pills. All the volunteers got colds, and there was no significant difference in the length of time the colds lasted. -To have confidence that the results of the experiment were valid, you'd also want to know

Which of these models is best studied through a systems approach?

The box numbered 2 represents which of the following?

After reading the paragraph below, answer the questions that follow. Scientists interested in knowing the best way to restore an area after a temporary road was built through it completed a study comparing two treatments: (1) restoring the contour of an area so that there was no longer a depression or cut-through where the road was previously and (2) simply abandoning the area to allow vegetation to return on its own. They wanted to know whether either or both of these treatments would return the aboveground vegetation and the belowground soil properties to their original state, as seen in a similar area where there had never been a road. -Which of the following best describes the data that the scientists should collect and how they should be compared?

To be scientifically valid, a hypothesis must be

Which of the following statements about ecosystems is false?

Organisms that are prokaryotes are in the domains

Members of the kingdom Animalia

A scientist performs a controlled experiment. This means that

A hypothesis is

After reading the paragraph below, answer the questions that follow. Researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. The robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting fibroblasts, which then attach to the robot and provide movement as they contract. -The robot's cardiac cells, working together in synchrony, could be considered at what level in life's hierarchy of organization?

Organisms belonging to the kingdom Plantae

Which of the following statements is not an example of evolution that has resulted from human activity?

If you eat a hamburger, you are mainly eating ground-up beef muscle. What levels of organization are represented in this ground-up muscle?

After reading the paragraph below, answer the questions that follow. Scientists interested in knowing the best way to restore an area after a temporary road was built through it completed a study comparing two treatments: (1) restoring the contour of an area so that there was no longer a depression or cut-through where the road was previously and (2) simply abandoning the area to allow vegetation to return on its own. They wanted to know whether either or both of these treatments would return the aboveground vegetation and the belowground soil properties to their original state, as seen in a similar area where there had never been a road. -This study was focused on which level of life's hierarchy?

Which of the following statements provides the best evidence that there is a common genetic code that demonstrates the unity of life?

After reading the paragraph below, answer the questions that follow. Researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. The robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting fibroblasts, which then attach to the robot and provide movement as they contract. -If the creators of the robot wanted to provide evidence that it is alive, which of the following properties would be best to use as evidence?

A theory is

Basic science discoveries often lead to the development of technology, and the development of technology often leads to new scientific discoveries. Which of the following is not an accurate pairing of a technology and a discovery?

After reading the paragraph below, answer the questions that follow. Scientists interested in knowing the best way to restore an area after a temporary road was built through it completed a study comparing two treatments: (1) restoring the contour of an area so that there was no longer a depression or cut-through where the road was previously and (2) simply abandoning the area to allow vegetation to return on its own. They wanted to know whether either or both of these treatments would return the aboveground vegetation and the belowground soil properties to their original state, as seen in a similar area where there had never been a road. -In this experiment, the area that had never had a road is useful to the experiment because