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