1. Which of the following explains most specifically the attraction of water molecules to one another? E. HYDROGEN BOND 2. Prokaryotes are classified as belonging to two different domains. What are the domains? E. BACTERIA AND ARCHAEA 3. Which of the following solutions has the greatest concentration of hydrogen ions [H]? B. GASTRIC JUICE AT pH 2 4. Why is ATP an important molecule in metabolism? C. IT PROVIDES ENERGY COUPLING BETWEEN EXERGONIC AND ENDERGONIC REACTIONS. 5. Had a pic sorry 6. Why does ice float in liquid water? D. HYDROGEN BONDS STABILIZE AND KEEP THE MOLECULES OF ICE FARTHER APART THAN THE WATER MOLECULES OF LIQUID WATER. 7. A water sample from a hot thermal vent contained a single-celled organism that had a cell wall but lacked a nucleus. What is its most likely classification? D. ARCHAEA 8. Isotopes of the same element have: D. THE SAME NUMBER OF ELECTRONS AND THE SAME ATOMIC NUMBER BUT DIFFERENT ATOMIC MASSES. 9. What is a hypothesis? B. A TENTATIVE EXPLANATION THAT CAN BE TESTED AND IS FALSIFIABLE. 10. Exergonic reactions are: C. SPONTANEOUS AND RELEASE ENERGY 11. Another picture 12. Which of the following sequences represents the hierarchy of biological organization from the least to the most complex? D. MOLECULE, CELL, ORGAN SYSTEM, POPULATION, ECOSYSTEM, BIOSPHERE 13. What is the chemical mechanism by which cells make polymers from monomers? D. DEHYDRATION REACTIONS 14. What results from an unequal sharing of electrons between atoms? A. A POLAR COVALENT BOND 15. Living organisms increase in complexity as they grow, resulting in decrease in the entropy of an organism. How does this relate to the second law of thermodynamics? B. AS A CONSEQUENCE OF GROWING, ORGANISMS CREATE MORE DISORDER IN THEIR ENVIRONMENT THAN THE DECREASE IN ENTROPY ASSOCIATED WITH THEIR GROWTH. 16. How does a noncompetitive inhibitor decrease the rate of an enzyme reaction? A. BY CHANGING THE SHAPE OF A REACTANT. 17. PICTURE 18. Most pH buffers are C. WEAK ACIDS OR WEAK BASES. 19. Pure, freshly distilled water has a pH of 7. This means that C. THE CONCENTRATION OF H IONS IN THE WATER EQUALS THE CONCENTRATION OF OH IONS IN THE WATER. 20. The disaccharide lactose, or milk sugar, is made of ______ plus ______. E. GLUCOSE; GALACTOSE 21. When
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