WHICH OF THE FOLLOWING MOLECULES CONTAINS THE FEWEST COVALENT BONDS?1. Which of the following are the sites within the human body where carbon dioxide and oxygen are exchanged? A. Alveoli B. Arteries C. Synapses D. Venules
2. Which of the following describes the most important reason for repeating an experimental investigation? A. To verify the validity of the original findings B. To expand upon the original investigation C. To manipulate the independent variable D. To attempt to disprove the hypothesis
3. Lithium has an atomic number of 3 and a mass number of 7. Which of the following is the number of protons in a lithium atom? A.3 B. 4 C. 7 D. 12
4. Which of the following molecules contains the fewest covalent bonds? A. Water molecule (Hp) B. Ammonia molecule (NH3) C. Methane molecule (CH4) D. Chlorine molecule (CI2)
5. When salt (NaCI) is added to water, it disassociates into Na• and Cl-ions. Which of the following types of chemical bond is present in a salt molecule? A. Covalent bond B. Ionic bond C. Hydrogen bond D. Disulfide bond
6. An example of active immunity is the transfer of A. antibodies through the placenta. B. immunoglobulins through breastfeeding. C. antigens through vaccination. D. immune cells through a blood transfusion. 7. Which of the following classes of biological molecules include enzymes? A. Carbohydrates B. Lipids C. Proteins D. Vitamins
8. Which of the following parts of the circulatory system carries oxygenated blood? A. An artery moving blood from the heart to the lungs B. A vein moving blood to the heart from the body C. An artery moving blood from the heart to a muscle cell D. A venule moving blood to the heart from the liver
9. Which of the following genetic terms describes an observable trait of an individual? A. Heterozygous B. Genotype C. Phenotype D. Homozygous
10. Mutations during which of the following processes in animals will affect offspring of succeeding generations? A. Meiosis B. Mitosis C. Translation D. Transcription
11. Which of the following will happen if mRNA fails to be translated? A. The cell’s nucleus will produce more chromatin. B. Ribosomes will not be able to create protein. C. Mitochondria will release ATP. D. The cell will produce more mRNA
12. Which of the following is the balanced equation for photosynthesis in plant cells? For this one, the formats of the answers are messed up. The balanced formula is 6Co2+6H20+Energy = C6H12O6+6O2. Looking at the answers I think B is the one with the correct formula but cannot be sure. A 3C0+ 3H0 + Energy –)-CH120 + 30 2 266 2 B. 6C0+ 6Hp + Energy–)-CHp + 60 2 616 2 C. CH0 + 30–)-3C0+ 3H0 + Energy 6126 2 2 2 D. CHp + 60–)-6C0+ 6Hp + Energy 616 2 2
13. Which of the following classes of biomolecules are frequently responsible for bringing about cell differentiation? A. Transcription factors B. lnterleukins C. Cytokines D. Nucleotidyl transferases
14. Which of the following is the pH when the concentrations of hydrogen ions and hydroxide ions in an aqueous solution are equal? A. 14 B. 7 C. 1 D. 0
15. Which of the following structures is present in both prokaryotic and eukaryotic cells? A. Golgi apparatus B. Cell membrane C. Endoplasmic reticulum D. Chloroplast
16. Which of the following is the purpose of valves in the venous circulatory system? A. Promoting movement of oxygenated blood toward the heart B. Facilitating stasis of blood in the veins C. Propelling blood through the vena cava D. Preventing backward flow of deoxygenated blood
17. Which of the following cellular organelles is the site of translation during protein synthesis? A. Cell membrane B. Nucleolus C. Golgi apparatus D. Ribosome
18. In an experiment, a researcher counts the number of oxygen bubbles produced by water plants placed under different colors of light. The researcher finds that water plants placed under white light release more oxygen bubbles than water plants placed under red light. Which of the following statements is best supported based on the observation? A. Light can break up water molecules to form oxygen. B. White light increases photosynthesis in plants. C. Red light has no affect on the release of oxygen from water plants. D. An increase in temperature decreases the amount of oxygen produced by plants. 19. When normal atmospheric conditions are present, water is constantly being cycled between liquid and gaseous states by which of the following pairs of processes? A. Turgor pressure and filtration B. Melting point and condensation C. Evaporation and condensation D. Filtration and evaporation
20. A scientist has noted a possible relationship between a certain chemical substance found in fish and the occurrence of kidney failure in humans. Which of the following preliminary steps should the scientist take before conducting a controlled experiment? A. Establish a cause and effect relationship between the substance and the outcome. B. Review the literature to determine what other research is available on this topic. C. Write a research grant proposal to the appropriate federal funding agency. D. Distribute letters of consent to human subjects who will be used in the research.
21. In the digestive tract, mouth is to bolus as A. stomach is to chyme. B. gallbladder is to insulin. C. small intestine is to carbohydrate. D. esophagus is to peristalsis.
22. A test is performed to see if applying fertilizer to rose bushes increases the number of flowers on bushes. Which of the following best relates to the hypothesis for this experiment? A. Watering all of the rose bushes the same amount throughout the experiment B. Predicting that fertilizer will increase the number of flowers on bushes C. Selecting a rose bush that will not be fertilized D. Measuring the number of flowers on the rose bushes each week
23. One neutron is added to the nucleus of an atom of carbon-12. In which of the following ways has the atom been changed? A. It bonds with different atoms. B. It has an atomic number of 7. C. It has been changed to an ion. D. It has a greater atomic mass.
24. PlantDeerTiger The first step in the energy chain that created the bonds of proteins in the tiger’s muscle cells in the food chain shown above is the A. deer the tiger ate. B. plant the deer ate. C. photons the sun made. D. carbohydrates the plant made.
25. Which of the following chemicals is insoluble in water? A. C6(benzene) H6 B. HCI {hydrochloric acid) C. NH3 (ammonia) D. NaHC03 (sodium bicarbonate)
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