BESC TEST BANK COMPLETE QUESTIONS
AND SOLUTIONS ALREADY GRADED A+
●● most suitable for anaerobic digestion and biogas production due to
its high organic content and biodegradability?
Answer: potato waste
●● what is not critical in biogas reactor design and does not influence
the efficiency of organic matter conversion and biogas production?
Answer: atmospheric pressure
●● during anaerobic digestion, acidogenesis is the stage where...
Answer: bacteria break down organic compounds into volatile fatty
acids (VFAs)
●● acetogenesis, the final stage of anaerobic digestion, involves the
conversion of acetate and hydrogen into methane and carbon dioxide.
true or false?
Answer: false; methanogenesis is the final stage of anaerobic digestion
●● order of stages in anaerobic digestion
Answer: 1. hydrolysis 2. acidogenesis 3. acetogenesis 4. methanogenesis
, ●● when anaerobic digestion utilizes simple substrates, which stage is
most likely to become the rate-limiting step?
Answer: methanogenesis
●● the theoretical methane yield from anaerobic digestion is constant
regardless of the type of organic matter being digested. true or false?
Answer: false; different substrates (i.e. carbohydrates, proteins, lipids)
have different yields
●● the theoretical methane yield from COD is approximately 0.35 liters
of methane per gram of COD. true or false?
Answer: true
●● methanogens are bacteria that produce methane from acetate or
hydrogen and carbon dioxide. true or false?
Answer: false; they are archaea, not bacteria
●● syntrophic relationships between different microbial groups are
essential for efficient anaerobic digestion. true or false?
Answer: true
●● hydrogen is considered an attractive energy carrier. however, the
production of biohydrogen always requires sunlight. true or false?
Answer: false; biohydrogen production does not always require sunlight
AND SOLUTIONS ALREADY GRADED A+
●● most suitable for anaerobic digestion and biogas production due to
its high organic content and biodegradability?
Answer: potato waste
●● what is not critical in biogas reactor design and does not influence
the efficiency of organic matter conversion and biogas production?
Answer: atmospheric pressure
●● during anaerobic digestion, acidogenesis is the stage where...
Answer: bacteria break down organic compounds into volatile fatty
acids (VFAs)
●● acetogenesis, the final stage of anaerobic digestion, involves the
conversion of acetate and hydrogen into methane and carbon dioxide.
true or false?
Answer: false; methanogenesis is the final stage of anaerobic digestion
●● order of stages in anaerobic digestion
Answer: 1. hydrolysis 2. acidogenesis 3. acetogenesis 4. methanogenesis
, ●● when anaerobic digestion utilizes simple substrates, which stage is
most likely to become the rate-limiting step?
Answer: methanogenesis
●● the theoretical methane yield from anaerobic digestion is constant
regardless of the type of organic matter being digested. true or false?
Answer: false; different substrates (i.e. carbohydrates, proteins, lipids)
have different yields
●● the theoretical methane yield from COD is approximately 0.35 liters
of methane per gram of COD. true or false?
Answer: true
●● methanogens are bacteria that produce methane from acetate or
hydrogen and carbon dioxide. true or false?
Answer: false; they are archaea, not bacteria
●● syntrophic relationships between different microbial groups are
essential for efficient anaerobic digestion. true or false?
Answer: true
●● hydrogen is considered an attractive energy carrier. however, the
production of biohydrogen always requires sunlight. true or false?
Answer: false; biohydrogen production does not always require sunlight
