PSB Natural Science Exam Study Questions and Answers

PSB Natural Science Exam Study Questions and Answers What is the name for any substance that stimulates the production of antibodies? - Ans:- antigen List the cellular hierarchy from the simplest to the most complex structure. (organism, organ, organ system, cell, tissue) - Ans:-cell, tissue, organ, organ system, organism If a cell is placed in a hypertonic solution what will happen to the cell? - Ans:-it will shrink Which group of major parts and organs make up the immune system? - Ans:-lymphatic system, spleen, tonsils, thymus, and bone marrow The rate of a chemical reaction depends on all the following except a. temperature b. surface area c. presence of catalyst d. amount of mass loss - Ans:-d. amount of mass loss GRACEAMELIA 2024/2025 ACADEMIC YEAR ©2024. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER, 2024 Page 2/53 Which of the answer choices provided best defines the following statement? For a given mass and constant temperature, an inverse relationship exists between the volume and pressure of a gas. a. Ideal Gas Law b. Boyle's Law c. Charles' Law d. Stefan-Boltzmann Law - Ans:-b. Boyle's Law Which of the following statements correctly compares prokaryotic and eukaryotic cells? a. Prokaryotic cells have a true nucleus, eukaryotic cells don not. b. Both prokaryotic and eukaryotic cells have a membrane. c. Prokaryotic cells do not contain membrane-bound organelles, eukaryotic cells do. d. Prokaryotic cells are more complex than eukaryotic cells. - Ans:-c. Prokaryotic cells do not contain membrane-bound organelles, eukaryotic cells do. What is the role of ribosomes? a. make proteins b. waste removal c. transport GRACEAMELIA 2024/2025 ACADEMIC YEAR ©2024. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER, 2024 Page 3/53 d. storage - Ans:-a. make proteins If an organism is AaBb, which of the following combinations in the gametes is impossible? a. AB b. aa c. aB d. Ab - Ans:-b. aa What is the oxidation number of hydrogen in CaH2? a. +1 b. -1 c. 0 d. +2 - Ans:-b. -1 Which hormone stimulates milk production in the breasts during lactation? - Ans:-Prolactin What is the typical result of mitosis in humans? - Ans:-two diploid cells Which of the following does NOT exist as a diatomic molecule? a. boron b. fluorine GRACEAMELIA 2024/2025 ACADEMIC YEAR ©2024. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER, 2024 Page 4/53 c. oxygen d. nitrogen - Ans:-a. boron Which of the following structures has the lowest blood pressure? a. arteries b. arteriole c. venule d. veins - Ans:-d. veins How does water affect the temperature of a living thing? - Ans:-Water keeps temperature stable What is another name for aqueous HI? a. hydroiodate acid b. hydrogen monoiodide c. hydrogen iodide d. hydriodic acid - Ans:-d. hydriodic acid Which of the heart chambers is the most muscular? a. left atrium GRACEAMELIA 2024/2025 ACADEMIC YEAR ©2024. ALL RIGHTS RESERVED. FIRST PUBLISH OCTOBER, 2024 Page 5/53 b. right atrium c. left ventricle d. right ventricle - Ans:-c. left ventricle Which of the following is not a product of the Krebs cycle? a. carbon dioxide b. oxygen c. adenosine triphosphate (ATP) d. energy carriers - Ans:-b. oxygen What is the name for the reactant that is entirely consumed by the reaction? a. limiting reactant b. reducing agent c. reaction intermediate d. reagent - Ans:-a. limiting reactant Which part of the brain interprets sensory information?