Welcome to the Quiz!
This quiz contains 12 questions from a mix of 1 subtopics.
What happens to the fatty acids after lipid hydrolysis during respiration?
they enter the glycolysis pathway directly
they are converted into two-carbon fragments
they are broken down into amino acids
they are converted into glycerol
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What happens to proteins during respiration?
they are directly converted into acetyl coenzyme A
they are hydrolysed into their constituent amino acids
they enter the glycolysis pathway without any changes
they are broken down into fatty acids
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What happens to the three-carbon compounds derived from amino acids during protein respiration?
they are converted into pyruvate
they undergo deamination
they enter the Krebs cycle directly
they are converted into fatty acids
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Why are amino acids generally used as a respiratory substrate only as a last resort?
they have low energy content
they are difficult to break down
they are not readily available in cells
they have more important, specialised functions
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Why do lipids provide more ATP per gram compared to carbohydrates?
they have a higher water content
they are easier to break down
they have a higher proportion of C-H bonds
they have a lower proportion of C-H bonds
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What does the respiratory quotient (RQ) represent?
the sum of the volume of carbon dioxide produced and the volume of oxygen used during respiration
the ratio of the volume of oxygen produced to the volume of carbon dioxide used during respiration
the difference between the volume of carbon dioxide produced and the volume of oxygen used during respiration
the ratio of the volume of carbon dioxide produced to the volume of oxygen used during respiration
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What instrument is used to measure the values needed to calculate the respiratory quotient?
respirometer
calorimeter
spectrophotometer
photometer
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Which respiratory substrate has an RQ value of 1.0?
carbohydrates
proteins
all have the same RQ value
lipids
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Which respiratory substrate has the lowest RQ value?
lipids
carbohydrates
all have the same RQ value
proteins
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Why do lipids and proteins have lower RQ values compared to carbohydrates?
they require more oxygen for their oxidation
they produce less carbon dioxide during respiration
they require less oxygen for their oxidation
they produce more water during respiration
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What does an RQ value of more than 1 indicate?
no respiration is occurring
aerobic respiration is occurring
photosynthesis is occurring
anaerobic respiration is occurring
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In plants, what might low RQ values suggest?
lipids are being used as the main respiratory substrate
high rates of respiration
anaerobic respiration is occurring
photosynthesis is occurring
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