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- 1. Multiple ChoiceA substance with a pH of 6 is calledan acida basewatera suspension
- 2. Multiple Choice
What kinds of atoms are bonded to carbon atoms in the molecule shown?helium, oxygen, and nitrogencalcium, hydrogen, and oxygenhydrogen, oxygen, and nitrogenhelium, carbon, and sodium - 3. Multiple ChoiceWhich statement is true about macromolecules?Simple sugars are made of polysaccharides.Glycerol is made of fatty acids.Proteins are made of amino acids.Nucleotides are made of nucleic acids.
- 4. Multiple ChoiceAn enzyme serves as a place where a chemical reaction can occur because-the enzyme is a substrate.the enzyme is one of the reactants in the reaction.the charge on the enzyme's active site is the same as the charge on the substrates.the shape of the substrates fits perfectly into the shape of the enzyme's active site.
- 5. Multiple ChoiceMost enzymes work best at about 37°C, normal body temperature, and each oneis usually specific to only one type of chemical reaction in the body.serves as a catalyst for several kinds of reactions.helps speed up reactions by a factor of 2.helps slow down reactions by a factor of 10.
- 6. Multiple ChoiceAn enzyme acts as a catalyst to a chemical reaction bylowering the activation energy needed to get the reaction started.making one of the substrates needed for the reaction.regulating the temperature at which the reaction takes place.providing energy to make the reaction proceed
- 7. Multiple ChoiceHow do enzymes control chemical reactions in the body?Enzymes speed up chemical reactions.Enzymes slow down chemical reactions.Enzymes increase the activation energy of a reaction.Enzymes inhibit the catalysts of a reaction.
- 8. Multiple ChoiceIn addition to serving as waterproof coverings or as parts of biological membranes, lipidsstore glucose and other sugars.store energy long-term.transmit hereditary information.supply energy for chemical reactions.
- 9. Multiple ChoiceThe ability of an enzyme to function properly depends on its environment. Unlike most enzymes in the human body, you would expect enzymes produced by the stomach to function best in an environment wherethe temperature is above normal body temperature.the acidity is very high.there are many other enzymes.the salt concentration is very high.
- 10. Multiple Choicefour most common elements that make up all living things are carbon, hydrogen,nitrogen, and iron.oxygen, and nitrogen.calcium, and phosphorus.oxygen, and iron.
- 11. Multiple ChoiceThe graph shows the effect of temperature on enzyme action. What characteristic do enzymes E1, E2, and E3 share?Their activity increases between 20°C and 30°C.Their activity is greatest between 5°C and 10°C.Their activity is at a low level between 15°C and 25°C.Their activity is at a high level between 30°C and 40°C.
- 12. Multiple ChoiceWhich of the following would be considered the most important elements of life?potassium, nitrogen, phosphorus, sulfurcarbon, hydrogen, oxygen, nitrogenhydrogen, oxygen, helium, nitrogenoxygen, nitrogen, magnesium, hydrogen
- 13. Multiple ChoiceWhich of the following describes the four major groups of biomolecules found in living things?Carbohydrates, lipids, nucleic acids, and proteinsCarbohydrates, amino acids, proteins, and nitrogen basesCarbohydrates, monomers, polymers, and proteinsNone of the other answers are correct.
- 14. Multiple ChoiceStoring and transmitting genetic material is the function of which biomolecule?ProteinsNucleic acidsLipidsCarbohydrates
- 15. Multiple ChoiceEnzymes are proteins that are found in cells. What is their role?They speed up chemical reactions in cells.They increase the activation energy needed for some reactions.They regulate the absorption of energy in chemical reactions.All the other answers are correct.
- 16. Multiple ChoiceEnzymes provide a site where reactants called substrates can be brought together in an enzyme-catalyzed reaction. The site is called theenzyme substrate complex.reaction site.active site.lock and key.
- 17. Multiple ChoiceA change in pH can change the shape of a protein. How might a change in pH affect the function of an enzyme?A new enzyme may be required to speed up the reaction.The enzyme may no longer be able to function for the substrate as a catalyst.The enzyme and substrate may no longer fit together so the enzyme cannot speed up the reaction.All the other answers are correct.
- 18. Multiple ChoiceThe structure of biomolecules is closely related to the functions they perform in living cells. Which statement below best illustrates this concept?Lipids may be saturated or unsaturated.Carbohydrates such as starch are long chains of sugar monomers.The active site of a protein enzyme precisely fits the shape of its substrate molecules.Proteins may be made up of chains that are folded or coiled.
- 19. Multiple ChoiceThe graph shows how enzymes affect reactions in cells. Which statement best summarizes the information shown in the graph?Enzymes increase the energy of the reactants.Enzymes decrease the energy level of the products.Enzyme decrease the activation energy of the reaction.Enzymes reverse the direction of the reaction.
- 20. Multiple ChoiceWhich of the following pairs of a biological monomer and one of its polymers is incorrect?Glucose and starchFatty acids and carbohydratesNucleotides and RNAAmino acids and proteins
- 21. Multiple ChoiceA lock and key is sometimes used as a model to promote understanding of enzymes. Which characteristic of enzymes or their action is best illustrated by this model?The sensitivity of enzymes to changes in pHThe change in activation energy the enzymes causeThe specificity of fit between an enzyme and a substrateThe increase in reaction rate due to the action of the enzyme
- 22. Multiple ChoiceWhat is a key difference between carbohydrates and proteins?Carbohydrates contain carbon; proteins do not.Proteins contain nitrogen; carbohydrates do not.Carbohydrates are biomolecules; proteins are not.Proteins contain covalent bonds; carbohydrates do not.
- 23. Multiple ChoiceThe diagram shows a structural formula of a biomolecule. What is the most likely function of this biomolecule?Storing energyFighting diseasesStoring genetic informationForming waterproof coverings
- 24. Multiple ChoiceWhich of the following is an example of a complex carbohydrate?MonosaccharidesStarchesLipidsGlucose
- 25. Multiple ChoiceA major function of fats, or lipids, is tostore energy.speed up chemical reactions in the cell.contain instructions that cells need to carry out their functions.provide one of the raw materials for photosynthesis.
- 26. Multiple ChoiceIdentify this biomolecule.CarbohydrateLipidProteinNucleic acid
- 27. Multiple ChoiceIdentify this biomoleculeProteinLipidCarbohydrateNucleic acid
- 28. Multiple ChoiceIdentify this biomoleculeProteinLipidCarbohydrateNucleic Acid
- 29. Multiple ChoiceIdentify this monomermonosaccharidefatty acidamino acidnucleotide
- 30. Multiple ChoiceIdentify this monomermonosaccharidefatty acidglycerolnucleotide
- 31. Multiple ChoiceIdentify this polymer.LipidDNARNAComplex carbohydrate
- 32. Multiple ChoiceWhat is indicated by letter C?enzymesubstrateactive siteenzyme-substrate complex
- 33. Multiple ChoiceWhat is indicated by letter A?enzymeproductsubstrateactive site
- 34. Multiple ChoiceWhat is shown by the number 4?productsubstrateenzyme-substrate complexEaster egg
- 35. Multiple ChoiceWhich pathway shows competitive inhibition?The red triangle pathwayThe orange block pathwayboth pathways show competitive inhibitionneither pathway shows competitive inhibition
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