biology : class12 Protein Content : Definition, Sources, Nutritional Importance : Single Cell Protein MCQ Questions and Answers
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Protein Content
MCQ questions and answers.
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MCQ Questions
1. Approximately what percentage of the dry weight of single-cell protein may be protein?
A.
5–10%
B.
20–30%
C.
50–80%
D.
90–100%
Correct Answer:
50–80%
Explanation:
Single-cell protein generally contains about 50–80% protein by dry weight, making it a protein-rich food or feed source.
2. Which feature makes single-cell protein nutritionally valuable as a protein source?
A.
Its high protein content
B.
Its complete absence of protein
C.
Its very high water content only
D.
Its low nutritional value
Correct Answer:
Its high protein content
Explanation:
The nutritional importance of single-cell protein is mainly due to its high proportion of protein in the dry biomass.
3. The protein content of many bacterial single-cell protein preparations is commonly close to which range?
A.
1–5%
B.
10–20%
C.
50–80%
D.
95–100%
Correct Answer:
50–80%
Explanation:
Bacterial biomass used as single-cell protein commonly contains approximately 50–80% protein by dry weight.
4. Spirulina is considered a rich source of single-cell protein because its dry biomass contains approximately:
A.
2–5% protein
B.
10–15% protein
C.
60–70% protein
D.
1% protein
Correct Answer:
60–70% protein
Explanation:
Spirulina has a high protein content, commonly estimated at about 60–70% of its dry weight.
5. Dried yeast used as single-cell protein generally contains approximately:
A.
5–10% protein
B.
20–25% protein
C.
45–55% protein
D.
90–95% protein
Correct Answer:
45–55% protein
Explanation:
Dried yeast biomass commonly contains about 45–55% protein by dry weight.
6. When comparing protein content on a dry-weight basis, which source generally has the highest protein percentage?
A.
Spirulina with about 60–70%
B.
Dried yeast with about 45–55%
C.
A crop containing about 10%
D.
A fruit containing about 5%
Correct Answer:
Spirulina with about 60–70%
Explanation:
Among the listed sources, Spirulina has the highest stated protein content on a dry-weight basis.
7. Why is the protein content of single-cell protein usually expressed on a dry-weight basis?
A.
Water can dilute the measured protein percentage
B.
Water is converted into protein during testing
C.
Drying removes all protein
D.
Protein exists only in liquid form
Correct Answer:
Water can dilute the measured protein percentage
Explanation:
Expressing protein as a percentage of dry weight gives a clearer measure because water content can greatly affect the apparent concentration.
8. A dried microbial biomass contains 60% protein by weight. How much protein is present in 100 g of this biomass?
A.
6 g
B.
30 g
C.
60 g
D.
100 g
Correct Answer:
60 g
Explanation:
A protein content of 60% means that 100 g of dry biomass contains 60 g of protein.
9. Which protein-content value is most typical of a high-protein single-cell protein product?
A.
3%
B.
15%
C.
65%
D.
99%
Correct Answer:
65%
Explanation:
Single-cell protein products commonly contain a high proportion of protein, often within the range of 50–80% by dry weight.
10. If two single-cell protein products contain 50% and 70% protein by dry weight, which product provides more protein in 100 g?
A.
The product containing 50% protein
B.
The product containing 70% protein
C.
Both provide no protein
D.
Both contain exactly 10 g protein
Correct Answer:
The product containing 70% protein
Explanation:
In 100 g of dry biomass, a 70% protein product provides 70 g of protein, which is more than the 50 g provided by a 50% protein product.
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