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- 1. Multiple Choice
Changes in temperature and pH can decrease an enzyme’s activity by breaking
peptide bonds
hydrogen bonds
amino acids
sulfur bonds
- 2. Multiple ChoiceFor the quickest source of energy if going for a run, you should eat a food that contains a high percentage ofsodiumproteinfatscarbohydrates
- 3. Multiple ChoiceThe specific reactants that an enzyme acts on are calledcatalystssubstratesproteinsamino acids
- 4. Multiple ChoiceAcetylcholine is an important chemical signal in the nervous system. It is broken down into other chemicals by cholinesterase.Cholinesterase is which of the following?enzymehormonelipidorganelle
- 5. Multiple ChoiceWhat happens to the speed of a chemical reaction when a catalyst is present?It becomes erratic.It stays the same.It speeds up.It slows down.
- 6. Multiple ChoiceWhich statement best describes the graph shown?Reaction B occurs at a slower rate.The original reaction is catalyzed.Less energy is needed to start reaction B.More energy is released by the original reaction.
- 7. Multiple ChoiceWhich phrase best describes an exothermic chemical reaction?releases more energy than it absorbsforms products with higher bond energy than reactantsdoes not absorb any energyis in a state of equilibrium
- 8. Multiple ChoiceWhat is the term for the amount of energy that needs to be added for a chemical reaction to start?bond energychemical energyactivation energyreactant energy
- 9. Multiple ChoiceDNA and RNA are two types ofproteinslipidscarbohydratesnucleic acids
- 10. Multiple ChoiceAn altered form of the protein collagen causes a condition where bones break easily. Which of the following are components of collagen?fatty acidsamino acidsnucleic acidsmonosaccharides
- 11. Multiple ChoiceFats, oils, and cholesterol are all types offatty acidslipidshormonescell membranes
- 12. Multiple ChoiceWhich category of carbon-based molecules includes sugars and starches?proteinscarbohydratesunsaturated fatty acidsphospholipids
- 13. Multiple ChoiceCarbon is unique due to the carbon atom’shydrogen bonding strengthionic compoundssix outer unpaired electronsbonding properties
- 14. Multiple ChoiceIn the lock-and-key model of enzyme function shown in the figure, what is happening in step 2?The active sites are restructuring the enzymeThe substrates are beginning to bind to the enzymeThe catalyzed reaction is releasing a product.The enzyme is causing new bonds to form between the substrates.
- 15. Multiple ChoiceWhich aspect of a chemical reaction is affected by enzymes?ratedirectionpHequilibrium
- 16. Multiple ChoiceThe activation energy needed for a chemical reaction is decreased by areactantproductcatalystsubstrate
- 17. Multiple ChoiceChemical reactions that absorb more energy than they release are calledexothermiccatalyzedendothermicactivated
- 18. Multiple ChoiceIdentify the products in this reaction: 6H2O + 6CO2 → C6H12O6+ 6O2.6H2O and 6CO26CO2 and C6H12O66H2O, C6H12O6, and 6O2C6H12O6 and 6O2
- 19. Multiple ChoiceSubstances are changed into different substances when bonds break and form duringion formationchemical equilibrium.chemical reactionshydrogen bonding
- 20. Multiple ChoiceBoth animal fats and plant oils are made up of glycerol andpolar moleculesphospholipidssaturated fatsfatty acids
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