ATI TEAS Practice Science Test

Correct Answer: D

Rationale: The correct answer is D because a taxonomic system classifies living things based on their molecular traits, allowing for a more accurate and scientific approach to categorizing organisms. This system helps in understanding evolutionary relationships and genetic similarities among species. Choice A is incorrect as behavior is not the primary focus of taxonomy. Choice B is not the main purpose of a taxonomic system, although naming new organisms is a part of it. Choice C is incorrect as distinguishing living things from nonliving things is more related to biology in general rather than specifically to taxonomy.

Correct Answer: B

Rationale: The purpose of an electrocardiogram (ECG) is to display the heart's rate and rhythm. It measures the electrical activity of the heart, showing how well it is functioning. By analyzing the ECG waveform, healthcare providers can assess the heart's health, detect any abnormalities, and diagnose various heart conditions. It provides crucial information about the heart's electrical impulses, such as the heart rate, rhythm, and any potential irregularities like arrhythmias. Therefore, choice B is correct. Choices A, C, and D are incorrect because an ECG does not indicate the rate of blood flow, identify a person's blood group type, or determine cell type in a blood sample.

Correct Answer: C

Rationale: The independent variable is the factor that is intentionally changed by the researcher. In this study, the type of road salt used is the independent variable because it is what the researcher is manipulating to observe its effect on the deicing time. The researcher can control and vary the type of road salt to measure its impact on the deicing process. The other choices are not the independent variable because: A (Deicing time period) is the dependent variable, B (Road used for deicing) is not something that the researcher is intentionally changing, and D (Amount of road salt used) is a controlled variable that can be adjusted but not the main factor being manipulated.

Correct Answer: A

Rationale: The correct answer is A: Forms neural circuits. Interneurons are responsible for forming connections between sensory neurons and motor neurons, creating neural circuits that allow for complex processing and coordination of signals within the central nervous system. They do not directly interact with effectors (choice B), send impulses to the CNS (choice C), or function as efferent nerve cells (choice D). Interneurons integrate and relay information within the CNS, playing a crucial role in coordinating various functions such as reflexes, sensory processing, and motor control.

Correct Answer: B

Rationale: The correct answer is B: The plant left outside in normal conditions serves as the control of the experiment. This is because the control group in an experiment remains unchanged and is used as a baseline for comparison. In this case, the plant left outside in normal conditions is the control as it is not subjected to any experimental manipulation, unlike the other tropical plants in the greenhouse. By comparing the growth of the plants in the greenhouse to the plant left outside, any changes in plant height can be attributed to the varying humidity levels, thus allowing for a valid comparison. Choice A is incorrect because plant height for each tropical plant is the experimental variable being measured, not the control. Choice C is incorrect as humidity level readings in the greenhouse are part of the experimental conditions, not the control. Choice D is incorrect because the amount of time used to study plant height is not the control of the experiment; it is the duration of the study.