Unit 1 Exam

Researchers notice that animal populations in a wildlife preserve have been decreasing. Which step should the researchers perform to obtain the most valid data about the decreasing animal population?*

• throughout the year count and record animals throughout the preserve, as well as log animal deaths

• count and track the number of guests visiting the preserve on a weekly basis

• analyze data about areas of the preserve that require extensive maintenance

• interview current and former employees about their favorite animal found in the preserve

The current knowledge concerning cells is the result of the investigations and observations of many scientists. The work of these scientists forms a well-accepted body of knowledge about cells. This body of knowledge is an example of which of the following?

• a hypothesis

• a theory

• a research plan

• a controlled experiment

Why should scientific experiments be repeatable and verifiable?

• This helps maintain the conversation between scientists.

• This helps prove that scientific theories cannot change.

• This helps ensure the validity of the data obtained during the experiment.

• If a scientific experiment cannot be replicated, then it is valid.

The invention of the microscope played an important part in developing the cell theory through allowing for the extensive design of investigations that confirmed observations with evidence. Which of the following is the most accurate statement about the nature and practice of science?

• Technology is required for gathering any data and for the development of a scientific theory.

• Scientific laws and theories both represent scientific information that is absolute and never changing.

• Scientific theories are ideas that have not been tested enough to become scientific laws.

• New scientific information and/or continuous investigations influence the development of scientific theory.

Which of the following is  not a true statement about compound light microscopes?

• They use light as their Illuminating source.

• They use electrons as their Illuminating source.

• They can be used to observe preserved specimens.

• They can be used to observe living specimens.

A science researcher is reviewing another scientist’s experiment and conclusion. The reviewer would most likely consider the experiment invalid if...

• it contains conclusions not explained by the evidence given

• other individuals are able to duplicate the results

• the sample size produced a great deal of data

• the hypothesis was not supported by the data obtained

A company that manufactures a popular multivitamin wanted to determine whether their multivitamin had any side effects. For its initial study, the company chose 2000 individuals to take one of their multivitamin tablets per day for one year. Scientists from the company surveyed the participants to determine whether they had experienced any side effects. The greatest problem with this procedure is that...

• the sample size was not large enough

• no control group was used

• only one brand of vitamin was tested

• the study lasted only one year

Which of the following statements is true about scientific theories?

• Scientific theories become scientific laws.

• Scientific theories are never proven.

• Scientific theories summarize patterns found in nature.

• Scientific theories become hypotheses.

Which of the following tools used by biologists would be the best choice for viewing a live bacteria cell?

• SEM

• electronic balance

• compound light microscope

• TEM

Which of the following statements best explains why birds fly south for the winter?

• Living things maintain internal balance.

• Living things respond to their environment.

• Living things are based on a universal genetic code

• Living things are made of cells.