Which combination best explains the primary biological contributors to food deterioration?
A) Insects, rodents, and mechanical abrasion
B) Lipids, carbohydrates, and protein oxidation
C) Bacteria, molds, yeasts, and their enzymatic activity
D) Protozoa, parasites, and ultraviolet light
Correct Answer:
C) Bacteria, molds, yeasts, and their enzymatic activity
Why can microbial metabolic activity render food unsafe for consumption?
A) Microbial activity generally increases the nutritional value of food, causing imbalance
B) Waste products and toxins produced during microbial growth can create conditions harmful to humans
C) Their metabolic waste products always neutralize harmful compounds
D) The breakdown of nutrients reduces caloric content, making food unsuitable
Correct Answer:
B) Waste products and toxins produced during microbial growth can create conditions harmful to humans
Which statement best explains how enzymes contribute to food spoilage?
A) Enzymes act only after microbial growth reaches its maximum phase
B) Enzymes prevent oxidation reactions by binding to oxygen molecules
C) Enzymes catalyze the breakdown of essential nutrients, leading to undesirable changes in food quality
D) Enzymes enhance the stability of nutrients by slowing down biochemical reactions
Correct Answer:
C) Enzymes catalyze the breakdown of essential nutrients, leading to undesirable changes in food quality
Enzymatic spoilage differs from microbial spoilage primarily because:
A) Enzymes can remain active even after microorganisms are inactivated, continuing to degrade food components
B) Microbial spoilage is faster than enzymatic spoilage in all food systems
C) Enzymes require living microorganisms to function
D) Enzymatic spoilage occurs only at extremely high temperatures
Correct Answer:
A) Enzymes can remain active even after microorganisms are inactivated, continuing to degrade food components
Which example correctly matches enzymatic activity with its effect on food quality?
A) Chlorophyllase activity contributes to color loss in vegetables
B) Protease activity enhances the firmness of fresh produce
C) Enzymatic browning causes fats to become rancid
D) Lipase activity softens fruit tissues
Correct Answer:
A) Chlorophyllase activity contributes to color loss in vegetables
Why does exposure to oxygen accelerate spoilage in many foods?
A) Oxygen converts carbohydrates into antimicrobial compounds
B) Oxygen promotes the growth of aerobic microorganisms that metabolize food components
C) Oxygen deactivates enzymes that protect food from degradation
D) Oxygen reduces microbial respiration, causing rapid nutrient accumulation
Correct Answer:
B) Oxygen promotes the growth of aerobic microorganisms that metabolize food components
Ph can affect the flavor and can influence microbial growth.
A) True
B) False
Correct Answer:
A) True
Which of the following best explains why cut fruits and vegetables undergo browning when exposed to air?
A) Oxygen exposure activates oxidative enzymes that react with phenolic compounds, forming brown pigments
B) Oxygen reacts directly with chlorophyll, converting it into carotenoids
C) The presence of oxygen increases cellular respiration, producing melanin as a by-product
D) The loss of moisture encourages the growth of anaerobic bacteria that release pigments
Correct Answer:
A) Oxygen exposure activates oxidative enzymes that react with phenolic compounds, forming brown pigments
Which statement best describes the relationship between temperature and enzymatic activity in food spoilage?
A) Enzymatic reaction rates generally increase with temperature up to an optimum, beyond which enzymes denature
B) Enzymatic activity decreases steadily as temperature increases, preventing spoilage
C) Enzymatic reactions occur only at freezing temperatures, slowing microbial growth
D) Enzymatic reactions are unaffected by temperature changes as long as oxygen is present
Correct Answer:
A) Enzymatic reaction rates generally increase with temperature up to an optimum, beyond which enzymes denature
Acetic acid bacteria are known to spoil beverages such as wine and beer. Which of the following best describes the biochemical process responsible for this spoilage?
A) They reduce organic acids into alcohols, causing sweetening and decreased acidity
B) The bacteria convert sugars directly into methane, increasing carbonation and bitterness
C) They oxidize ethanol into acetic acid, producing sour flavors and degrading beverage quality
D) The bacteria ferment proteins into ammonia, producing off-odors and cloudiness
Correct Answer:
C) They oxidize ethanol into acetic acid, producing sour flavors and degrading beverage quality
Why can foodborne illness occur even after the bacteria that originally contaminated the food are no longer present?
A) Because the bacteria leave behind spores that immediately infect human cells
B) Because the absence of bacteria increases the PH of food, making it toxic
C) Because dead bacterial cells release oxygen radicals that damage human tissue
D) Because toxins produced during bacterial growth can remain stable in food and cause illness when ingested
Correct Answer:
D) Because toxins produced during bacterial growth can remain stable in food and cause illness when ingested
Which of the following best explains why mold-contaminated food can pose health risks even without being consumed?
A) Mold growth increases the oxygen concentration in the surrounding air, which can irritate the lungs
B) Mold produces only non-volatile toxins that remain confined to the food surface
C) Mold spores can release airborne allergenic compounds that may trigger respiratory or allergic reactions when inhaled
D) Mold consumes all available nutrients in the environment, weakening the immune system of nearby individuals
Correct Answer:
C) Mold spores can release airborne allergenic compounds that may trigger respiratory or allergic reactions when inhaled
What are the two main ingredients of this fermenting video?
A) Vegetables and vinegar
B) Vegetables and sugar
C) Vegetables and salt
D) Salt and vinegar
Correct Answer:
C) Vegetables and salt
What is the percentage of salt in the jar of turnips being fermented?
A) 4%
B) 3%
C) 2%
D) 5%
Correct Answer:
A) 4%
Vegetable fermentation relies on specific environmental conditions to promote the growth of lactic acid–producing bacteria. Which environment best supports this type of fermentation?
A) Aerobic environment with high sugar concentration
B) Anaerobic environment with high salt concentration
C) High-oxygen environment with neutral PH
D) Anaerobic environment with strong alkaline conditions
Correct Answer:
B) Anaerobic environment with high salt concentration
When preparing fermented vegetables in a brine solution, why is it essential that the vegetables remain fully submerged?
A) To prevent yeast activity and encourage mold growth
B) To maintain an anaerobic environment required for lactic acid bacteria
C) To neutralize acids produced during fermentation
D) To increase oxygen diffusion and stimulate aerobic respiration
Correct Answer:
B) To maintain an anaerobic environment required for lactic acid bacteria
During vegetable fermentation, the sour taste intensifies as the microbes metabolize available carbohydrates. Which biochemical process is mainly responsible for generating the compounds that produce this sourness?
A) Alcoholic fermentation, producing ethanol and co₂
B) Β-oxidation of fatty acids, producing acetyl-coa
C) Lactic acid fermentation, producing organic acids—primarily lactic acid
D) Oxidative phosphorylation, producing atp and water
Correct Answer:
C) Lactic acid fermentation, producing organic acids—primarily lactic acid
If you plan to ferment vegetables for a long time, it is better to use a (BLANK) ratio.
A) Higher sugar
B) Higher salt
C) Lower vegetable
D) Lower salt
Correct Answer:
B) Higher salt
For how long were the second batch of Hakurei turnips being fermented and at what salinity?
A) 4 months, 3%
B) 3 month, 4%
C) 2 months, 4%
D) 4 months, 5%
Correct Answer:
B) 3 month, 4%
What does he call the “greatest condiment of all time”?
A) Curtido
B) Relish
C) Beets
D) Turnips
Correct Answer:
A) Curtido
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Final Quizlet40
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Final Articles20
