Question: A student investigating the importance of wavelengths above and below the visible spectrum for photosynthesis sets up an experiment as follows over a 2-month period… Which of the following statements is most likely to be correct?
Answer Choices: A. Three plants do not provide sufficient replications to draw a conclusion. B. Wavelength of light is the only variable that has been changed between groups. C. The wavelength of light does not affect photosynthesis. D. Infrared light contains more energy than the other wavelengths.
Answer: A. Three plants do not provide sufficient replications to draw a conclusion.
Question: Which of the following substances is excreted by sweat glands in response to the breakdown of proteins and the formation of ammonia?
Answer Choices: A. Lysozymes B. Urea C. Water D. Sebum
Answer: B. Urea
Question: Carbon has an atomic number of 6. Which of the following is true about the isotope C-12?
Answer Choices: A. C-12 possesses 7 neutrons and 5 electrons in its nucleus. B. C-12 possesses 7 protons and 5 neutrons in its nucleus. C. C-12 possesses 6 neutrons and 6 protons in its nucleus. D. C-12 possesses 6 protons and 6 electrons in its nucleus.
Answer: C. C-12 possesses 6 neutrons and 6 protons in its nucleus.
Question: The following diagram summarizes the carbonic acid-bicarbonate ion buffer system of the blood: CO₂ + H₂O ↔ H₂CO₃ ↔ HCO₃⁻ + H⁺. Which of the following equations shows the reaction that takes place when there are excessive protons (H⁺) in the blood?
Answer Choices: A. H₂CO₃ → CO₂ + H₂O B. HCO₃⁻ + H⁺ → H₂CO₃ C. H₂CO₃ → HCO₃⁻ + H⁺ D. CO₂ + H₂O → H₂CO₃
Answer: B. HCO₃⁻ + H⁺ → H₂CO₃
Question: Which of the following is correct regarding the pH scale?
Answer Choices: A. A substance with a pH of 3 is 10 times more alkaline than a substance with a pH of 4. B. A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4. C. A substance with a pH of 3 is two times more alkaline than a substance with a pH of 4. D. A substance with a pH of 3 is two times more acidic than a substance with a pH of 4.
Answer: B. A substance with a pH of 3 is 10 times more acidic than a substance with a pH of 4.
Question: Which of the following is a property of water?
Answer Choices: A. Water is made up of one molecule of hydrogen and two molecules of oxygen. B. Solid water is more dense than liquid water. C. Water dissolves polar and ionic compounds. D. Water requires less heat than ethanol to raise its temperature.
Answer: C. Water dissolves polar and ionic compounds.
Question: Which of the following occurs during inhalation?
Answer Choices: A. Air moves from areas of low pressure to areas of high pressure. B. The ribcage lowers. C. The volume of the thoracic cavity decreases. D. The diaphragm moves downward.
Answer: D. The diaphragm moves downward.
Question: Which of the following describes why water has a concave, or downward-curving, meniscus when poured in a glass beaker?
Answer Choices: A. The adhesive forces with the glass are greater than the cohesive forces. B. The cohesive forces with the glass are greater than the adhesive forces. C. Glass has a higher density than water. D. Water has a higher density than glass.
Answer: A. The adhesive forces with the glass are greater than the cohesive forces.
Question: A vasectomy is a procedure in which the vas deferens are cut. Which of the following describes why a vasectomy leads to infertility?
Answer Choices: A. The vasectomy blocks the movement of sperm from the epididymis into the urethra. B. The vasectomy blocks the movement of sperm from the ejaculatory duct into the bulbourethral gland. C. The vasectomy blocks the movement of sperm from the prostate gland to the bulbourethral gland. D. The vasectomy blocks the movement of sperm from a testis into the epididymis.
Answer: A. The vasectomy blocks the movement of sperm from the epididymis into the urethra.
Question: Which of the following is a function of a catalyst?
Answer Choices: A. To increase the activation energy of a reaction. B. To increase the product yield. C. To convert a nonspontaneous reaction to a spontaneous reaction. D. To increase the rate of a reaction.
Answer: D. To increase the rate of a reaction.
Question: Lifelong protection after exposure to a virus such as chickenpox is due to which of the following types of immunity?
Answer Choices: A. Nonspecific B. Transplantation C. Active D. Innate
Answer: C. Active
Question: Which of the following best describes adaptive immunity?
Answer Choices: A. The body’s barrier defenses, such as mucous membranes and secretions. B. The initiation of internal defenses, such as phagocytes and natural killer cells. C. A response to specific traits of specific pathogens. D. The initiation of the inflammatory response.
Answer: C. A response to specific traits of specific pathogens.