1. What does digestibility of single-cell protein refer to?
A.
The ease with which its nutrients are broken down and absorbed by the body
B.
The speed at which it reproduces
C.
The amount of water present in the culture
D.
The ability to produce oxygen
Correct Answer:
The ease with which its nutrients are broken down and absorbed by the body
Explanation:
Digestibility describes how easily the nutrients in single-cell protein are digested and absorbed by the consuming organism.
2. Single-cell protein is generally considered useful as food because it is often:
A.
Highly digestible
B.
Completely indigestible
C.
Free from all nutrients
D.
Made only of minerals
Correct Answer:
Highly digestible
Explanation:
Many sources of single-cell protein contain nutrients that can be digested and utilized efficiently by the body.
3. Which feature can reduce the digestibility of some microbial single-cell protein?
A.
A tough or resistant cell wall
B.
A high water content alone
C.
Rapid microbial growth
D.
A pleasant taste
Correct Answer:
A tough or resistant cell wall
Explanation:
A resistant microbial cell wall may prevent digestive enzymes from reaching the nutrients easily, thereby lowering digestibility.
4. Why may processing improve the digestibility of some single-cell protein products?
A.
It can break or weaken the microbial cell walls
B.
It removes all proteins
C.
It stops nutrient absorption
D.
It converts proteins into minerals
Correct Answer:
It can break or weaken the microbial cell walls
Explanation:
Processing can make nutrients inside microbial cells more accessible to digestive enzymes, improving digestibility.
5. Which type of nutrient in single-cell protein must be digested into smaller units before absorption?
A.
Protein
B.
Oxygen
C.
Water vapour
D.
Carbon dioxide
Correct Answer:
Protein
Explanation:
Proteins in single-cell protein are broken down into smaller molecules, mainly amino acids, before they are absorbed.
6. A single-cell protein source with high digestibility would be expected to:
A.
Provide nutrients that are readily absorbed
B.
Pass through the digestive system unchanged
C.
Contain no usable protein
D.
Prevent digestion of other foods
Correct Answer:
Provide nutrients that are readily absorbed
Explanation:
High digestibility means that the nutrients can be broken down and absorbed efficiently by the body.
7. Which statement about the digestibility of single-cell protein is correct?
A.
It can vary among different microbial sources
B.
It is exactly the same for every microorganism
C.
It does not depend on cell structure
D.
It is always zero in algal protein
Correct Answer:
It can vary among different microbial sources
Explanation:
Different microorganisms have different cell-wall structures and compositions, so their single-cell proteins may differ in digestibility.
8. Digestive enzymes can use single-cell protein more easily when:
A.
The nutrients are accessible inside the microbial cells
B.
The cells have completely resistant walls
C.
The protein is removed from the product
D.
The product contains only waste material
Correct Answer:
The nutrients are accessible inside the microbial cells
Explanation:
Accessibility of intracellular nutrients allows digestive enzymes to break down the protein more effectively.
9. What is a likely result of low digestibility in a single-cell protein product?
A.
Less efficient use of its nutrients
B.
Faster absorption of all proteins
C.
Complete utilization of every nutrient
D.
Increased breakdown of resistant cell walls without processing
Correct Answer:
Less efficient use of its nutrients
Explanation:
When digestibility is low, fewer nutrients are released and absorbed, reducing the nutritional benefit of the product.
10. Why is digestibility an important quality of single-cell protein used as food or feed?
A.
It determines how efficiently its nutrients can be utilized
B.
It determines the colour of the microorganism
C.
It controls the microorganism's reproduction in soil
D.
It measures the amount of sunlight required for growth
Correct Answer:
It determines how efficiently its nutrients can be utilized
Explanation:
Good digestibility allows the body to obtain and use more of the protein and other nutrients present in single-cell protein.
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