Exam 1: Biology: Exploring Life

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 cells, which then attach to the robot and provide movement as they contract. -All of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. This is an example of

Members of the kingdom Animalia

Which statement about genetics is true?

When a scientist examined museum specimens of a particular moth species, she noticed that the variation in color was distributed as shown in the first graph. She was surprised because her data from current collections indicated the distribution of colors shown in the second graph. Which hypothesis about the cause of this shift in the range of genetic variation is the most likely to be supported by examination of the distribution of colors in a collection assembled at a time between that of the collection of the museum specimens and her current specimens?

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 cells, 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?

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

Which statement about ecosystems is false?

Which statement best describes the relationship between a tissue and an organ system?

A theory is a(n)

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 (sugar pill). 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

The role of a control in an experiment is to

Which level in the hierarchy shown is a community?

Which statement about the properties of life is false?

To be scientifically valid, a hypothesis must be

Which statement about evolution is true?

Which sequence is not a correct pathway of energy through an ecosystem?

Life is organized in a hierarchical fashion. Which sequence correctly lists that hierarchy from least inclusive to most inclusive?

This graph shows an increase in the number of species of pesticide-resistant insects from 1900 to 2000. -Based on the graph, during what years did pesticide application likely become prevalent?

Which statement about bacteria is true?

An antibiotic kills 99.9% of a bacterial population. You would expect the next generation of bacteria to