Science TEAS Practice Test

Correct Answer: D

Rationale: The correct answer is D because T cells play a crucial role in the immune response by recognizing and attacking infected cells or pathogens. They are a type of white blood cell, making choice B valid. Choice C is accurate as T cells mature in the thymus during their development. Choice A is incorrect because T cells are present in all individuals, not just those with leukemia.

Correct Answer: C

Rationale: The correct answer is C: Repeat the experiment several more times and apply a statistical analysis to the data. This is the most appropriate next step because it allows the researcher to gather more data to ensure the results are consistent. By repeating the experiment multiple times, the researcher can determine if the observed behavior of the bacteria is reliable and not just due to chance. Additionally, applying statistical analysis will help in drawing meaningful conclusions from the data and identifying any patterns or trends. Choice A is incorrect because it overlooks the contradictory result from the fourth experiment, which is crucial information that should not be ignored in scientific reporting. Choice B is also incorrect as it does not address the need for further investigation to validate the results. Choice D is not the best next step as it introduces a new variable (chemical), which could complicate the analysis and may not directly address the observed behavior of the bacteria in response to the initial chemical.

Correct Answer: C

Rationale: The correct answer is C: The rectum. The genitourinary system consists of organs involved in reproduction and waste elimination. The rectum is part of the digestive system, not the genitourinary system. The kidneys (A), urethra (B), and bladder (D) are all essential components directly involved in the production, storage, and elimination of urine. The rectum plays a role in the elimination of solid waste and is not part of the genitourinary system.

Correct Answer: C

Rationale: The correct answer is C: Covalent. In DNA, sugar and phosphate molecules are joined together by covalent bonds. Covalent bonds involve sharing of electrons between atoms, providing a strong and stable connection. This type of bond is essential for the structural integrity of the DNA molecule. A: Hydrogen bonds are important in DNA structure, but they connect the nitrogenous bases, not sugar and phosphate. B: Ionic bonds involve the transfer of electrons between atoms, not sharing, and are not typically involved in connecting sugar and phosphate in DNA. D: "Overt" is not a recognized type of chemical bond; it is an incorrect distractor.

Correct Answer: D

Rationale: The correct answer is D: Homeostasis. The endocrine system is responsible for regulating various physiological processes to maintain internal balance, or homeostasis, within the body. Hormones released by endocrine glands help control metabolism, growth, reproduction, and other functions. Choice A (Heartbeat) is controlled by the cardiovascular system, not the endocrine system. Choice B (Respiration) is controlled by the respiratory system. Choice C (Electrolyte and water balance) is regulated by the kidneys and not directly by the endocrine system. Thus, the primary function of the endocrine system is to maintain homeostasis through hormone regulation.