Food Science & Chemistry Quiz
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Questions and Answers

Which flavor compound is found in peppermint?

  • Citral
  • Menthol (correct)
  • Limonene
  • Cinnamaldehyde
  • What is the main pigment responsible for the yellow color in carrots?

  • Carotenoids (correct)
  • Betanins
  • Curcumins
  • Anthocyanins
  • Which of the following compounds smells like rotten eggs?

  • Putrescine
  • Hydrogen sulfide (correct)
  • Methanethiol
  • Cinnamaldehyde
  • What color do anthocyanins exhibit in acidic environments?

    <p>Red</p> Signup and view all the answers

    In the absence of oxygen, myoglobin appears in which color?

    <p>Purple</p> Signup and view all the answers

    What is a common role of enzymes in food processing?

    <p>Control texture and flavor</p> Signup and view all the answers

    Which pigment gives beetroot its red color?

    <p>Betanins</p> Signup and view all the answers

    What sensory experience is typically not achieved by isolating flavors?

    <p>Natural flavor complexity</p> Signup and view all the answers

    What role does rennet play in cheese production?

    <p>It helps in the coagulation of milk.</p> Signup and view all the answers

    Which of the following factors affects the physicochemical properties of food?

    <p>Moisture content</p> Signup and view all the answers

    Which enzyme is NOT typically involved in softening plant tissues?

    <p>Lipase</p> Signup and view all the answers

    What is the primary effect of enzymatic browning in food?

    <p>Causes off-flavors and off-odors.</p> Signup and view all the answers

    Which of the following enzymes is used for tenderizing meat?

    <p>Papain</p> Signup and view all the answers

    What enzyme is responsible for the initial oxidation in enzymatic browning?

    <p>Polyphenol oxidase</p> Signup and view all the answers

    What effect does water activity ($a_w$) have on food properties?

    <p>It affects microbial growth.</p> Signup and view all the answers

    Which is NOT a chemical property affecting food characteristics?

    <p>Color</p> Signup and view all the answers

    What is the primary enzyme responsible for the process of enzymatic browning in foods?

    <p>Polyphenol oxidase</p> Signup and view all the answers

    Which compound is oxidized to form dehydroascorbic acid?

    <p>Ascorbic acid</p> Signup and view all the answers

    What effect does acidic conditions have on chlorophyll during heat processing?

    <p>Causes chlorophyll to lose magnesium</p> Signup and view all the answers

    What compound is formed during the Amadori rearrangement?

    <p>Ketosamine</p> Signup and view all the answers

    What is one possible consequence of enzymatic hydrolysis on food texture?

    <p>Promotes microbial spoilage</p> Signup and view all the answers

    Which amino acid is noted for causing the darkest browning due to its reactivity?

    <p>Lysine</p> Signup and view all the answers

    What role does ascorbic acid play in reactions involving reactive oxygen species?

    <p>It terminates chain radical reactions</p> Signup and view all the answers

    What is the initial stage of the caramelization process?

    <p>Sugar enolization</p> Signup and view all the answers

    Which of the following accurately describes the process of acid hydrolysis?

    <p>Facilitates hydrolytic rancidity</p> Signup and view all the answers

    What type of reaction is caramelization classified as?

    <p>Non-enzymatic browning</p> Signup and view all the answers

    Which of the following is required as a cofactor for ascorbic acid oxidase activity?

    <p>Cu2+</p> Signup and view all the answers

    What is a common product formed through the dehydration of ketosamines?

    <p>Diacetyl</p> Signup and view all the answers

    Which chemical reaction primarily causes color degradation in green vegetables during heat processing?

    <p>Degradation of chlorophylls</p> Signup and view all the answers

    Which component of chlorophyll makes it particularly susceptible to degradation?

    <p>Chlorin ring</p> Signup and view all the answers

    Which of the following is a result of the Strecker degradation process?

    <p>Brown nitrogenous polymers</p> Signup and view all the answers

    At what temperature does granulated sugar begin to melt during caramelization?

    <p>160°C</p> Signup and view all the answers

    What does rigor mortis refer to in meat processing?

    <p>The stiffness of muscle tissue due to actomyosin cross-link formation.</p> Signup and view all the answers

    What happens to ATP levels in muscle tissue after slaughter?

    <p>ATP levels quickly deplete as glycolysis stops.</p> Signup and view all the answers

    How does the pH level affect glycolysis in meat post-slaughter?

    <p>Glycolysis stops when a pH of 5.5 is reached.</p> Signup and view all the answers

    Which of the following methods minimizes the formation of actomyosin cross-links?

    <p>Hanging the carcass after slaughter.</p> Signup and view all the answers

    What is the result of a low glycogen supply in muscle tissue after slaughter?

    <p>Depletion of ATP before pH reaches 5.5.</p> Signup and view all the answers

    How does temperature control impact meat tenderness during the rigor mortis stage?

    <p>Optimum temperatures between 15–20˚C minimize fiber shortening.</p> Signup and view all the answers

    What initiates the process of rigor mortis in muscle tissue?

    <p>Reduction of ATP and calcium ion availability.</p> Signup and view all the answers

    What constitutes the primary mechanism responsible for meat toughness during rigor mortis?

    <p>Irreversible actomyosin cross-links due to ATP depletion.</p> Signup and view all the answers

    Which type of fatty acids contain only cis double bonds of biological origin?

    <p>Unsaturated fatty acids</p> Signup and view all the answers

    What is the role of enoyl-CoA isomerase in fatty acid oxidation?

    <p>It converts cis-beta,gamma double bonds to trans-alpha,beta double bonds.</p> Signup and view all the answers

    What kind of systems include free radical scavengers and metal chelators as active substances?

    <p>Antioxidant packaging systems</p> Signup and view all the answers

    Which enzyme is responsible for converting 3,5-dienoyl-CoA to 2,4-dienoyl-CoA?

    <p>3,5-2,4-dienoyl-CoA isomerase</p> Signup and view all the answers

    Where do additional double bonds in unsaturated fatty acids occur?

    <p>At three-carbon intervals</p> Signup and view all the answers

    Which problem is solved by the action of 3,2-enoyl-CoA isomerase?

    <p>Conversion of trans-3-enoyl-CoA to trans-2-enoyl-CoA</p> Signup and view all the answers

    Which of the following fatty acids has one double bond at an odd-numbered carbon and another at an even-numbered carbon?

    <p>Linoleic acid</p> Signup and view all the answers

    What mechanism do advanced packaging systems utilize to incorporate antioxidants?

    <p>Covalent attachment to the packaging surface</p> Signup and view all the answers

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