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NES Biology (305) Practice Tests & Test Prep by Exam Edge - Exam Info



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NES Biology - Additional Information

At ExamEdge.com, we focus on making our clients' career dreams come true by offering world-class practice tests designed to cover the same topics and content areas tested on the actual National Evaluation Series NES Biology (305) Certification Exam. Our comprehensive NES Biology practice tests are designed to mimic the actual exam. You will gain an understanding of the types of questions and information you will encounter when you take your National Evaluation Series NES Biology Certification Exam. Our NES Biology Practice Tests allow you to review your answers and identify areas of improvement so you will be fully prepared for the upcoming exam and walk out of the test feeling confident in your results.

Because our practice tests are web-based, there is no software to install and no need to wait for a shipment to arrive to start studying. Your NES Biology practice tests are available to you anytime from anywhere on any device, allowing you to study when it works best for you. There are 20 practice tests available, each with 150 questions and detailed explanations to help you study. Every exam is designed to cover all of the aspects of the NES Biology exam, ensuring you have the knowledge you need to be successful!

NES Biology - Additional Info Sample Questions

Jenny has four (4) compounds that she is testing on the growth of bacteria on various Petri dishes. From past experiments, she knows that she will be able to count the colonies by seeing them with the naked eye. The growth media of the plates are identical, except for the presence of one of four (1 of 4) compounds, or a control dish to which a similar amount of physiological saline is added. Which of the following is the dependent variable?

Correct Answer:
the number of colonies.


in scientific experiments, understanding the roles of dependent and independent variables is crucial for interpreting results accurately. in jenny's experiment, where she investigates the effect of four different compounds on the growth of bacterial colonies, the dependent variable is "the number of colonies." this is because the dependent variable is what the researcher measures and what is expected to change as a result of manipulating the independent variable.

the independent variables in jenny's experiment are the four different compounds and the control (physiological saline). these are considered independent because they are the variables that jenny deliberately changes to observe how they affect the growth of bacterial colonies. each petri dish receives a different treatment (a different compound or the control), and the outcome (the number of bacterial colonies) is then measured.

the growth media, while crucial for the experiment, is a controlled variable. this means that it remains constant across all experimental conditions. the consistency of the growth media ensures that any observed differences in the growth of bacterial colonies can be attributed to the differences in the compounds tested, rather than variations in the nutritional content or other properties of the media.

thus, the dependent variable, "the number of colonies," directly reflects the impact of the independent variables (the compounds and control) under the steady conditions provided by the controlled variable (the growth media). this setup allows jenny to conclude which compounds are effective or ineffective in influencing bacterial growth compared to the control.