NLN Pax Science Practice Tests Questions & Answers () with 100% Correct Answers

A person blows his breath into a straw that is placed in limewater. The limewater becomes cloudy because the person's breath contains: - ANSWER-carbon dioxide A person who was in an auto accident has formed a blood clot at the site of the injury. One event that can lead to formation of a blood clot is that: - ANSWER-ruptured platelets release thromboplastin A student focuses sunlight to a point with a thin converging (convex) lens. Which of these direct measurements can the student make as a result of this experiment? - ANSWER-the approximate focal length of the lens In ecological succession, the first living thing to colonize a hitherto barren area is called a: - ANSWER-pioneer organism Unicellular organisms that have a nucleus and can swim with the aid of cilia are examples of: - ANSWER-protozoans Which of these conditions is associated with smoking? - ANSWER-emphysema Which of these quantities is most closely associated with an object's inertia? - ANSWER-Mass Which of these sequences of anatomic organization, from the simplest level to the most complex, is the correct sequence? - ANSWER-From tissue, organ, organ system to organism Which part of the cell structure controls the passage of materials into and out of the cell? - ANSWER-Plasma membrane While working in the chemistry laboratory, a student spills dilute hydrochloric acid on her hand. What is the first action this student should take? - ANSWER-Flush her hand with large quantities of water Within a living cell, the oxygen (O2) from a mixture of O2 and carbon dioxide (CO2) is used up. This creates a concentration gradient across the cell membrane, drawing O2 across the membrane from the outside in, a process known as - ANSWER-Diffusion