ATI TEAS 7
ATI TEAS 7 Version 1 Science Questions
Extract:
Question 1 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.
Extract:
Question 2 of 5
What process causes most of the carbon dioxide from the blood to move into alveoli?
Correct Answer: B
Rationale: The correct answer is B: Diffusion down a concentration gradient. In the alveoli, there is a higher concentration of carbon dioxide in the blood compared to the air, leading to the movement of carbon dioxide from the blood into the alveoli through diffusion. This natural movement occurs due to the concentration gradient, ensuring the elimination of carbon dioxide during respiration. Active transport, a process requiring energy, is not involved in this movement. Passive transport using carrier proteins is not the primary mechanism for carbon dioxide movement in the lungs. Conversion to carbon monoxide is incorrect as it does not explain the physiological process of carbon dioxide exchange in the alveoli.
Question 3 of 5
Which substance protects the body from ultraviolet rays?
Correct Answer: D
Rationale: Melanin is the pigment responsible for skin color and serves as a natural defense against ultraviolet (UV) rays. When the skin is exposed to UV rays, melanin production increases to absorb and dissipate the radiation, acting as a protective mechanism. This helps prevent DNA damage, reducing the risk of skin cancer and other UV-induced skin issues. Therefore, melanin is the substance that effectively shields the body from the harmful effects of UV radiation.
Question 4 of 5
What is essential for new scientific findings to be published?
Correct Answer: B
Rationale: For new scientific findings to be published, it is essential for other scientists to validate or disapprove of the findings. This validation process, known as peer review, ensures the credibility and reliability of the research. Peer review allows for critical evaluation, verification, and identification of any potential errors or biases in the study, thereby upholding the integrity and quality of scientific knowledge. Without this validation by peers, the scientific community cannot confidently accept the findings as accurate and trustworthy, making the peer review process a crucial step in the dissemination of scientific knowledge.
Question 5 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.