ATI TEAS Practice Science Test

Correct Answer: B

Rationale: The correct answer is B (18). Ossification at the growth plate occurs during adolescence when bones undergo rapid growth and development. At around age 18, the growth plates begin to close as bone growth slows down, leading to ossification replacing cartilage. At age 5 (A), the growth plates are still actively contributing to bone growth. At age 42 (C) and 91 (D), ossification is more likely related to aging processes and repair rather than growth plate replacement.

Correct Answer: A

Rationale: The hypodermis is primarily composed of adipose tissue, which is a type of connective tissue. Adipose tissue serves as a layer of insulation and energy storage in the body. It helps regulate body temperature and provides cushioning for organs. Adipose tissue is the main component of the hypodermis, making choice A the correct answer. Choices B, C, and D are incorrect because the hypodermis is not primarily composed of regular connective tissue, epithelial tissue, or muscle tissue.

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.

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 correct answer is B: Negative feedback. In this scenario, the body's response to a fever is an example of negative feedback mechanism. Negative feedback works to maintain homeostasis by reversing the direction of a change, in this case, reducing the fever to bring the body back to its normal temperature. This mechanism helps to regulate and stabilize bodily functions. Summary: A: Equal feedback is not a recognized type of feedback mechanism in biological systems. C: Neutral feedback does not actively regulate a response but rather allows it to continue unchanged. D: Positive feedback would amplify the fever response rather than work to reduce it and is usually seen in processes that need to be amplified, not regulated like in this scenario.