ATI TEAS 7 Science

Correct Answer: B

Rationale: The correct answer is B: Humoral immunity. B-cells produce antibodies that circulate in bodily fluids to combat pathogens. This is a key aspect of humoral immunity. A: Cell-mediated immunity involves T-cells directly attacking infected cells, not antibody secretion by B-cells. C: Innate immunity is non-specific and does not involve B-cells producing antibodies. D: Phagocytic immunity involves phagocytes engulfing and destroying pathogens, not antibody secretion by B-cells.

Correct Answer: C

Rationale: The correct answer is C: Vitamin D. When the skin is exposed to sunlight, a form of cholesterol in the skin is converted into Vitamin D. This vitamin plays a crucial role in calcium absorption and bone health. Vitamin A is not synthesized in the skin but obtained through diet. Vitamin C is obtained from fruits and vegetables. Vitamin E is a fat-soluble vitamin found in nuts and seeds. In summary, only Vitamin D is synthesized in the skin upon sunlight exposure, making it the correct answer.

Correct Answer: B

Rationale: The correct answer is B: Abdomen. The spleen is a large lymphatic organ located in the upper left quadrant of the abdomen, below the diaphragm and behind the stomach. Its main function is to filter blood, store blood cells, and assist in immune response. The other choices (A: Chest, C: Pelvis, D: Head and neck) are incorrect because the spleen is not located in these areas anatomically. The spleen's specific location in the abdomen is crucial for its functions and interactions with other organs in the abdominal cavity.

Correct Answer: A

Rationale: The correct answer is A: Group 1. Alkali metals are located in Group 1 of the periodic table because they have one electron in their outermost shell, making them highly reactive. These elements include lithium, sodium, potassium, and others. Group 2 (Choice B) consists of alkaline earth metals, Group 7 (Choice C) consists of halogens, and Group 8 (Choice D) consists of noble gases. Alkali metals exhibit unique properties due to their single valence electron, distinguishing them from elements in the other groups mentioned.

Correct Answer: C

Rationale: The Law of Conservation of Energy states that energy cannot be created or destroyed, only transferred or transformed within a closed system. Therefore, the total amount of energy in a closed system remains constant over time. This is because energy is conserved and does not disappear or appear out of nowhere. The other choices are incorrect because energy does not increase (choice A) or decrease (choice B) in a closed system unless energy is coming in or going out of the system. The total energy in a closed system is independent of the temperature of the system (choice D) and is solely determined by the initial energy within the system and any energy transfers or transformations that occur within it.