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- 1. Multiple ChoiceWhich organic molecule is primarily used by cells as a source of energy?Amino AcidFatty AcidGlucoseProtein
- 2. Multiple ChoiceWhich is true about the structure of starch molecules and protein
molecules?Starches and proteins are both polymers.Starches and proteins are both amino acids.Starches and proteins are both built from simple sugars.Starches and proteins are both built from nucleic acids. - 3. Multiple ChoiceWhich organic compounds necessary for life are formed by a sugar bonded
to a phosphate group and a nitrogenous base?lipidsproteinsnucleic acidscarbohydrates - 4. Multiple ChoiceWhich is a function of lipids?to supply cells with quick–release energyto provide the body with insulationto store genetic informationto regulate cell processes
- 5. Multiple ChoiceWhich best explains the function of the sequence of nucleotides?It provides energy.It carries genetic information.It allows DNA to be successfully copied.It determines the shape of the DNA molecule.
- 6. Multiple ChoiceProteins are compounds formed in the cells of plants and animals. Which element is included in every protein molecule?calciumcarbonfluorinesodium
- 7. Multiple ChoiceWhich is a least likely primary function of proteins?to act as an organic catalystto supply short-term energyto build and repair damaged cellsto defend against foreign invaders
- 8. Multiple ChoiceWhich organic molecule is paired with its function?nucleic acid : to store energyproteins : to provide insulationlipids : to regulate metabolic processescarbohydrate : to provide quick–release energy
- 9. Multiple ChoiceFats are specialized lipid molecules, and enzymes are specialized protein molecules. How do
the functions of fats and enzymes differ?Fats are structural building materials, while enzymes are transportation molecules.Fats provide support for cells, while enzymes lower the pH of gastric fluids.Fats regulate body functions, while enzymes denature invasive bacteria.Fats are storage molecules, while enzymes are catalytic molecules. - 10. Multiple ChoiceWhich organic molecule serves as a catalyst?lipidsproteinsnucleic acidcarbohydrates
- 11. Multiple ChoiceWhich are the building blocks of most lipid molecules?glucose and proteinglucose and fatty acidsfatty acids and glycerolamino acids and glycerol
- 12. Multiple ChoiceWhich of these statements describes how monomers combine and create macromolecules?Amino acids combine to make proteins.Glucose molecules combine to make nucleic acids.Nucleic acids combine to make starch.Proteins combine to make glucose.
- 13. Multiple ChoiceAll organisms contain DNA and RNA. What are the subunits of DNA and RNA?simple sugarsamino acidscarbohydratesnucleotides
- 14. Multiple ChoiceWhat is the significance of nucleic acids for cells?They generate energy for the cell.They restrict what enters and leaves the cell.They support and maintain the shape of the cell.They provide all instructions for cellular activities.
- 15. Multiple Choice
What is most likely being shown?amino acidschromosomesDNARNA - 16. Multiple ChoiceWhich best describes the role of hemoglobin in red blood cells?It hydrates human body tissues.It supplies support to human body tissues.It transports oxygen to human body tissues.It increases the rate of reactions in body tissues.
- 17. Multiple ChoiceIn organisms, macromolecules are made up of subunits. Which of these pairs correctly describes
how a macromolecule is constructed?DNA is made up of nucleic acids.Protein is made up of amino acids.Nucleic acids are made up of DNA.Amino acids are made up of protein. - 18. Multiple ChoiceWhich best explains enzyme specificity?An enzyme reacts best at a certain pH.An enzyme reacts best at a certain temperature.An enzyme is able to react with only one substrate.An enzyme is able to react with many different substrates.
- 19. Multiple ChoiceWhy are enzymes essential to all multicellular organisms?They provide insulation.They produce living tissue.They contain genetic information.They catalyze metabolic reactions.
- 20. Multiple ChoiceWhy is the “lock and key” analogy often used to describe enzyme
function?Each enzyme is the same as its substrate.Each enzyme will fit with only one specific kind of substrate.Each enzyme can only be used once in a reaction and cannot be used
again.Each enzyme has its own active site that will not fit with other active
sites. - 21. Multiple ChoiceEnzymes act as catalysts in biochemical reactions. Which is the enzyme?wxywx
- 22. Multiple ChoiceWhich best describes how an enzyme affects the rate of a chemical
reaction?It increases the temperature of the reaction.It lowers the activation energy of the reaction.It changes the products created in the reaction.It causes the reaction to proceed in an unfavorable direction. - 23. Multiple ChoiceAmylase is a biocatalyst that hydrolyzes starch into simple sugar
molecules in the pancreas. Which best describes amylase?lipidproteinfatty acidcarbohydrate - 24. Multiple ChoiceWhich best explains how the structure of enzymes is related to their
function?Enzyme structures release the energy in their substrates.Enzyme structures react with their substrates.Enzymes’ unique active site allows it to fit with only one substrate
molecule.Enzymes interact with their substrates like welders building a steel
skyscraper. - 25. Multiple ChoiceWhich best explains the purpose of the active site of an enzyme?The active site is for the attachment of the substrate.The active site changes to fit any available substrate.The active site determines how many reactions will be catalyzed.The active site determines how fast the reaction is allowed to occur.
- 26. Multiple ChoiceWhich type of substances serves as a catalyst for reactions that break large food molecules into
smaller useful molecules?enzymesvitaminslipidsnucleotides - 27. Multiple ChoiceTo which class of organic compounds do enzymes belong?proteinsfatty acidsnucleic acidsmonosaccharides
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