ATI TEAS 7
ATI TEAS 7 Version 1 Science Questions
Extract:
Question 1 of 5
What is the primary function of centrosomes in animal cells?
Correct Answer: D
Rationale: Centrosomes play a crucial role in animal cells by organizing microtubules. They act as the main microtubule organizing center (MTOC) and are essential for various cellular processes such as cell division, cell shape maintenance, and intracellular transport. Correctly organized microtubules are vital for maintaining cell structure and function, making option D, 'Microtubule organization,' the correct answer.
Extract:
Question 2 of 5
Which of the following substances is responsible for donating H+ ions to act as a buffer when blood pH rises?
Correct Answer: D
Rationale: Carbonic acid is a pivotal buffer in blood that plays a key role in maintaining pH balance. When blood pH rises, indicating increased alkalinity, carbonic acid releases hydrogen ions (H+) to counterbalance the excess base, thereby preventing significant changes in pH levels. This mechanism highlights the essential function of carbonic acid in regulating the acid-base equilibrium in the blood.
Question 3 of 5
In light of the recent discovery that worm infection can relieve certain autoimmune disorders, how should the hypothesis be modified regarding parasitic infections?
Correct Answer: A
Rationale: The recent discovery that worm infection can relieve certain autoimmune disorders suggests a need to modify the hypothesis. Instead of viewing all parasitic infections as harmful, the new information indicates that worm infection can actually reduce certain autoimmune disorders. This challenges the previous belief and highlights a potential therapeutic benefit. Choices B, C, and D do not reflect the new understanding and should be eliminated. Therefore, option A, 'Worm infection reduces certain autoimmune disorders,' aligns with the updated hypothesis based on the recent discovery and is the correct answer.
Question 4 of 5
Why do chloride ions have a negative charge?
Correct Answer: C
Rationale: Chloride ions (Cl-) have a negative charge because they gained an electron. When an atom gains an electron, it increases the number of negative charges relative to positive charges, resulting in a net negative charge, as seen in chloride ions. In the case of chloride ions, a chlorine atom gains an extra electron to achieve a stable electron configuration, turning it into a chloride ion with a negative charge.
Question 5 of 5
Which of the following properties of water explains its solvent abilities for certain substances?
Correct Answer: B
Rationale: The correct answer is B: Polarity. Water's polarity, resulting from its unequal sharing of electrons and the formation of hydrogen bonds, makes it an excellent solvent. The polar nature of water allows it to interact with and dissolve substances that have charges or partial charges, aiding in their breakdown at a molecular level. Choices A, C, and D are not directly associated with water's solvent capabilities. High specific heat (Choice A) refers to water's ability to resist temperature changes, volume (Choice C) is the amount of space occupied by water, and high surface tension (Choice D) pertains to water's cohesive properties.