# Metabolic Rate Trivia Questions and Answers

1: What percentage of a human’s energy expenditure is used by the liver?
A: 10%
B: 19%
C: 27%
D: 7%
Explanation: The liver uses about 27% of a human’s total energy expenditure.

2: Which organ uses approximately 19% of the body’s energy expenditure?
A: Brain
B: Heart
C: Kidneys
D: Skeletal muscle
Explanation: The brain uses about 19% of the body’s energy expenditure.

3: What proportion of energy expenditure is spent on physical activity in humans?
A: 10%
B: 20%
C: 50%
D: 70%
Explanation: About 20% of a human’s energy use comes from physical activity.

4: What proportion of energy expenditure is involved in the digestion of food?
A: 5%
B: 10%
C: 15%
D: 20%
Explanation: Digestion of food accounts for about 10% of energy expenditure.

5: Which metabolic process generates ATP and releases carbon dioxide?
A: Glycolysis
B: Krebs cycle
C: Electron transport chain
D: Fermentation
Explanation: The Krebs cycle produces ATP molecules and releases carbon dioxide.

6: Which organ system consumes the most energy when an animal is at rest?
A: Digestive system
B: Skeletal system
C: Basal metabolism
D: Nervous system
Explanation: Basal metabolism consumes the most energy when an animal is at rest, as it includes all the vital processes needed for survival.

7: What primary molecule is involved in energy storage during metabolism?
A: DNA
B: RNA
C: ATP
D: Glucose
Explanation: ATP (adenosine triphosphate) is the molecule that stores energy during metabolism.

8: What is the term for the breakdown of large molecules into smaller ones with release of energy?
A: Anabolism
B: Catabolism
C: Homeostasis
D: Glycogenesis
Explanation: Catabolism is the process of breaking down large molecules into smaller ones with the release of energy.

9: How much variation in BMR can be explained by differences in body mass minus fat?
A: 26.7%
B: 62.3%
C: 32.8%
D: 15.5%
Explanation: 62.3% of the variation in BMR can be explained by differences in body mass minus fat.

10: What does ATP stand for?
C: Analine triphosphate
D: Thymine triphosphate
Explanation: ATP stands for adenosine triphosphate.

11: How much energy does the heart use from the total energy expenditure?
A: 5%
B: 7%
C: 10%
D: 19%
Explanation: The heart uses about 7% of the total energy expenditure.

12: On a log-log scale, what is the approximate slope of the metabolic rate vs. body size for mammals?
A: 0.5
B: 0.75
C: 1.0
D: 1.5
Explanation: On a log-log scale, the slope of the metabolic rate versus body size for mammals is about 0.75.

13: What type of organism has a similar metabolic relationship to body size as mammals?
A: Protists
B: Plants
C: Fungi
D: Viruses
Explanation: Protists have a similar metabolic relationship to body size as mammals.

14: Which process in warm-blooded animals produces body heat?
A: Fermentation
B: Glycolysis
C: Anabolism
D: Catabolism
Explanation: Body heat in warm-blooded animals is produced by chemical reactions of the catabolic type.

15: What process is termed as the building up of molecules?
A: Catabolism
B: Hydrolysis
C: Anabolism
D: Fermentation
Explanation: Anabolism is the process of building up molecules.

16: What measurement was the average BMR in kcal per day in a Scottish study?
A: 1027 kcal
B: 2499 kcal
C: 1500 kcal
D: 1790 kcal
Explanation: The average BMR in the Scottish study was 1500 kcal per day.

17: Basal metabolic rate (BMR) includes energy expenditure for all the following except:
A: Heartbeat
B: Digestion
C: Breathing
D: Muscle contraction
Explanation: Muscle contraction is not included; BMR is for energy used by vital organs at rest.

18: Which two macronutrients are typically involved in metabolic processes?
A: Carbohydrates and fats
B: Vitamins and minerals
C: Fiber and water
D: Antioxidants and phytochemicals
Explanation: Carbohydrates and fats are macronutrients involved in metabolic processes.

19: What was the low end of the BMR range in the Scottish study (in kcal/day)?
A: 1027 kcal/day
B: 1500 kcal/day
C: 1790 kcal/day
D: 2499 kcal/day
Explanation: The low end of the BMR range in the study was 1027 kcal/day.

20: Which organ consumes the most energy for maintaining fluid levels in tissues?
A: Kidneys
B: Liver
C: Heart
D: Brain
Explanation: The kidneys consume a lot of energy for maintaining fluid levels through osmosis.

21: What percentage of BMR variation was unexplained according to the Scottish study?
A: 6.7%
B: 26.7%
C: 1.7%
D: 62.3%
Explanation: 26.7% of BMR variation was unexplained.

22: Which process converts proteins to amino acids?
A: Anabolism
B: Catabolism
C: Glycolysis
D: Glycogenesis
Explanation: Catabolism converts proteins to amino acids.

23: How much of the variation in BMR could be explained by the amount of body fat?
A: 15.5%
B: 26.7%
C: 32.8%
D: 6.7%
Explanation: 6.7% of the variation in BMR could be explained by body fat amount.

24: What is the primary end product released from the Krebs cycle?
A: Lactic acid
B: Water
C: Carbon dioxide
D: Oxygen
Explanation: The Krebs cycle releases carbon dioxide as a primary end product.

25: How do metabolic rates vary according to animal size?
A: Directly proportional to body volume
B: Functionally different from body surface
C: Independant of body size
D: Highest in smaller animals proportionally
Explanation: Metabolic rates vary in a way that is functionally different from a direct function of body surface.

26: What proportion of basal metabolism energy is taken up by vital organs?
A: 50%
B: 30%
C: 70%
D: 90%
Explanation: Most energy of basal metabolism goes to the functioning of vital organs.

27: In a log-log metabolic rate graph, a slope of 0.75 would indicate what about the relationship between metabolism and body size?
A: It’s exponential
B: It’s a straight line
C: It shows a plateau
D: It has a zero gradient
Explanation: On a log-log scale, the relationship forms a straight line with a slope of 0.75.

28: What is the energy-rich molecule that drives muscle contraction?
A: DTP
B: ATP
C: CPT
Explanation: ATP is the primary energy-rich molecule driving muscle contraction.

29: Which of the following does not contribute to the basal metabolic rate?
A: Regular walking
B: Heartbeat
C: Breathing
D: Nervous system function
Explanation: Regular walking does not contribute to BMR; it is factored in physical activity energy expenditure.

30: How much of daily energy is used by the kidneys?
A: 19%
B: 18%
C: 10%
D: 27%
Explanation: The kidneys use about 10% of the body’s total energy expenditure.

31: The building up of proteins from amino acids is an example of which process?
A: Glycolysis
B: Catalysis
C: Anabolism
D: Oxidation
Explanation: Anabolism is the building-up process, such as forming proteins from amino acids.

32: How much energy expenditure can be attributed to experimental error in BMR studies?
A: 1.7%
B: 6.7%
C: 2%
D: 26.7%
Explanation: Experimental error, including within-subject difference, accounted for 2% of the variation.

33: What role does oxygen play in metabolism?
A: Transporting fats
B: Breaking down vitamins
C: Providing energy by oxidation
D: Excreting waste
Explanation: Oxygen provides energy by oxidizing macronutrients, essential for metabolism.

34: How fast do the top 5% of people metabolize energy compared to the lowest 5%?
A: 15-20% faster
B: 25-27% faster
C: 28-32% faster
D: Same rate
Explanation: The top 5% of people metabolize energy 28-32% faster than the lowest 5%.

35: What energy source is important in sustaining basal life processes?
A: Glucose
B: Fatty acids
C: Protein
D: ATP
Explanation: ATP is critical in sustaining basal life processes.

36: What is an example of a catabolic reaction?
A: Protein synthesis
B: ATP formation
C: Digestion of food
D: DNA replication
Explanation: Digestion and breakdown of food is a catabolic reaction releasing energy.

37: What study size was used to determine the variation in BMR for Scottish adults?
Explanation: The study involved 150 adults to investigate variations in BMR.

38: How is the metabolic rate of ‘cold-blooded’ animals compared to mammals?
A: Higher
B: Lower
C: Similar
D: No correlation
Explanation: Research shows similar relationships in metabolic rates when related to body size.

39: What proportion of energy at rest is utilized by the skeletal muscle?
A: 7%
B: 19%
C: 27%
D: 18%
Explanation: Skeletal muscle uses about 18% of energy expenditure when at rest.

40: Which cycle is central to biochemical energy production?
A: Krebs cycle
B: Calvin cycle
C: Oxygen cycle
D: Nitrogen cycle
Explanation: The Krebs cycle is central to energy production in cellular metabolism.

41: How do individuals with the same lean body mass show different BMR rates?
A: Based on sleep patterns
B: Due to differences in metabolic efficiency
C: Because of dietary intake
D: No differences observed
Explanation: Individuals with the same lean body mass can show different BMR due to their metabolic efficiency.

42: What macromolecule is associated with the term catabolism?
A: Sugars
B: Starch
C: Proteins
D: Nucleic acids
Explanation: Protein breakdown into amino acids is an example of catabolism.

43: The conversion of carbohydrates, fats, and proteins into ATP is part of which cycle?
A: Calvin cycle
B: Krebs cycle
C: Nitrogen cycle
D: Phosphorus cycle
Explanation: The Krebs cycle converts these macronutrients into ATP.

44: What percentage of total energy expenditure is due to basal metabolic functions in humans?
A: 10%
B: 20%
C: 50%
D: 70%
Explanation: About 70% of total energy expenditure in humans goes to basal metabolic functions.

45: What kind of relationship is indicated by a straight line slope on a log-log scale for body size vs metabolic rate?
A: Direct proportion
B: Inverse proportion
C: Exponential relation
D: Power law relation
Explanation: A straight line on a log-log scale represents a power-law relation.

46: What’s the approximate energy difference between high and low BMR individuals of the same body mass?
A: 300 kcal/day
B: 425 kcal/day
C: 715 kcal/day
D: 965 kcal/day
Explanation: The energy difference can be up to 715 kcal/day.

47: What process happens in the body after eating that uses chemical energy?
A: Breathing
B: Walking
C: Digestion
D: Sleeping
Explanation: Digestion of food after eating uses chemical energy and produces heat.

48: How are animal metabolic rates typically measured?
A: Through movement patterns
B: By tracking sleep cycles
C: Oxygen consumption
D: Food intake analysis
Explanation: Metabolic rates are often measured through oxygen consumption.

49: Which vital organ group consumes the least energy among those listed?
A: Heart
B: Brain
C: Liver
D: Kidneys
Explanation: The heart uses about 7% of the total energy, comparatively the least.

50: What is one potential reason for the unexplained variance in BMR?
A: Genetic differences
B: Different diets
C: Temperature variations
D: Physical exercise
Explanation: Genetic differences might be responsible for the unexplained variance in BMR.

51: What is the main chemical bond energy source in ATP?
A: Carbon bonds
B: Magnesium bonds
C: Phosphate bonds
D: Calcium bonds
Explanation: The energy is stored in the chemical bonds of the two terminal phosphate groups of ATP.

52: What activity would be equivalent to a significant BMR difference in two individuals?
A: Mountain climbing
B: Swimming daily
C: 10 km run daily
D: Cycling
Explanation: A significant BMR difference equivalent to one completing a 10 km run daily.

53: How much of daily energy use arises from digestion after eating?
A: 5%
B: 10%
C: 15%
D: 20%
Explanation: About 10% of daily energy use comes from digesting food after eating.

54: What kind of slope do metabolic rates form on a body mass graph?
A: Curved
B: Horizontal
C: Straight line
D: Zigzag
Explanation: Metabolic rates form a straight line on a log-log scale body mass graph.

55: How does the energy breakdown from food generate heat in the body?
A: Through mechanical work
B: By chemical reactions
C: Via electrical impulses
Explanation: Chemical reactions during food breakdown generate heat in the body.

56: Which of the following percentages is not a key contributor to energy use as per the table?
A: 7%
B: 10%
C: 18%
D: 50%
Explanation: 50% energy use isn’t listed, while 7% for the heart, 10% for kidneys, and 18% for muscles are.

57: Which study confirmed the metabolic rate variance in individuals with the same body mass?
A: Hemmingsen 1960
B: Kleiber 1947
C: Scottish study
D: General metabolism research
Explanation: The Scottish study confirmed such individual metabolic rate variances.

58: What can significant differences in BMR between two people imply?
A: Variation in sleep cycle
B: Different levels of physical exercise
C: Higher efficiency in energy utilization
D: More frequent food intake
Explanation: Significant differences suggest higher efficiency in energy utilization.

59: What serious metabolic study first showed the relationship between body size and metabolic rate?
A: Calvin research
B: Kleiber’s graph
C: ATP findings
D: Genetic studies
Explanation: Kleiber’s original graph showed the relationship between body size and metabolic rate.

60: What explains the high energy use of the brain despite its small size relatively?
A: High nerve activity
B: Large oxygen requirement
C: Intense glucose consumption
D: Frequent cell division
Explanation: The brain consumes large amounts of glucose, explaining its high energy use.

Disclaimer: Please consult a physician before making any changes to your health regimen.

Jessmyn Solana

Jessmyn Solana is the Digital Marketing Manager of Interact, a place for creating beautiful and engaging quizzes that generate email leads. She is a marketing enthusiast and storyteller. Outside of Interact Jessmyn loves exploring new places, eating all the local foods, and spending time with her favorite people (especially her dog).

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