Multiple Choice
In the context of nutritional factors affecting microbial growth, which of the following foods is least likely to support bacterial growth under normal storage conditions due to very low water activity?
10. Dynamics of Microbial Growth
Nutritional Factors of Microbial Growth
Multiple Choice
Which type of food best supports rapid bacterial growth under typical room-temperature conditions?
A
High-sugar food such as jam or honey (high osmotic pressure)
B
Highly acidic food such as vinegar-based pickles (low pH)
C
Dry, low-water-activity food such as crackers or cereal
D
Moist, protein-rich food with near-neutral pH (e.g., cooked meat or milk)
Verified step by step guidance1
Understand that bacterial growth depends on several environmental factors, including moisture content, nutrient availability, pH, and osmotic pressure.
Recognize that moisture is essential for bacterial metabolism and reproduction; foods with high water activity support faster bacterial growth.
Consider nutrient content: protein-rich foods provide amino acids and other nutrients that bacteria need to grow rapidly.
Evaluate pH: most bacteria grow best near neutral pH (around 6.5 to 7.5), while highly acidic foods inhibit bacterial growth.
Analyze osmotic pressure: high sugar or salt concentrations create high osmotic pressure, which can inhibit bacterial growth by drawing water out of bacterial cells.
Related Videos
Related Practice
