ATI TEAS 7
ATI TEAS 7 Version 1 Science Questions
Extract:
Question 1 of 5
Which of the following statements is correct regarding the pH scale?
Correct Answer: D
Rationale: The correct answer is D. The pH scale measures the acidity or basicity of a substance on a scale of 0 to 14. Each whole pH value below 7 is ten times more acidic than the next higher value. Therefore, a substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4. The difference in pH values indicates the concentration of hydrogen ions in the substance, with lower pH values representing higher acidity and higher pH values representing higher basicity.
Extract:
Question 2 of 5
Which of the following macromolecules forms the cytoskeleton of a cell?
Correct Answer: A
Rationale: The correct answer is Proteins (Choice A). The cytoskeleton of a cell is primarily composed of proteins. Proteins such as actin, tubulin, and intermediate filaments form the structural framework of the cytoskeleton, providing support, shape, and aiding in cellular movement. Carbohydrates, nucleic acids, and lipids do not constitute the cytoskeleton; instead, they serve various functions within the cell. Therefore, understanding the composition of the cytoskeleton is crucial for comprehending cellular structure and function.
Question 3 of 5
What causes osteoporosis?
Correct Answer: B
Rationale: Osteoporosis is a condition characterized by reduced bone density and mass, leading to brittle bones. Osteoblasts are cells responsible for forming new bone tissue, while osteoclasts break down old or damaged bone. In osteoporosis, there is a decrease in osteoblast activity, causing a net loss of bone as the breakdown surpasses formation. Meanwhile, osteoclast activity remains relatively stable. This imbalance between bone formation (osteoblast activity) and bone resorption (osteoclast activity) contributes to the development of osteoporosis by reducing bone strength and increasing susceptibility to fractures.
Question 4 of 5
Which of the following organs is covered by the pleura, a connective tissue sheath?
Correct Answer: B
Rationale: The pleura is a protective membrane that covers the lungs. It consists of two layers: the visceral pleura (inner layer) and the parietal pleura (outer layer). The pleural space between these layers contains a small amount of fluid that helps reduce friction during breathing movements. The spleen, heart, and liver are not covered by the pleura. Therefore, the correct answer is the lungs.
Question 5 of 5
What summarizes a change that occurs as solids transition into liquids?
Correct Answer: A
Rationale: The correct answer is A. When solids transition into liquids, particles become less ordered. In a solid state, particles are arranged in a fixed, orderly pattern due to strong intermolecular forces. As the solid transitions into a liquid, these forces weaken, allowing the particles more freedom of movement. Consequently, the particles become less ordered in a liquid compared to a solid, where they have more mobility and are not bound in a fixed structure.