,26/27 BIOL 121/BIOD 121 MODULE 5 EXAM |
NUTRITION -PORTAGE | Q&A + DETAILED
RATIONALES
1. A college student begins a fitness program and wants to understand the meaning of
physical fitness. Which description is most appropriate?
A) Absence of all chronic disease regardless of activity level
B) Ability to maintain a low body weight through dietary restriction
C) Capacity to perform only vigorous athletic competition
D) Ability to perform moderate-to-vigorous physical activity effectively while
supporting health and daily function
Correct Answer: Ability to perform moderate-to-vigorous physical activity effectively
while supporting health and daily function
Rationale: Physical fitness describes the capacity to perform physical activity and daily
tasks with adequate endurance, strength, flexibility, and physiological reserve. It is broader
than athletic performance and cannot be determined solely from body weight or absence of
diagnosed disease.
2. Someone wants a balanced exercise program rather than specializing in a single
activity. Which combination best addresses the major components emphasized in a
comprehensive fitness routine?
A) Aerobic activity, resistance training, and flexibility work
B) Stretching, fasting, and protein supplementation
C) Resistance training, calorie restriction, and sleep reduction
D) Aerobic activity, dehydration training, and passive recovery
Correct Answer: Aerobic activity, resistance training, and flexibility work
Rationale: Aerobic exercise develops cardiorespiratory endurance, resistance training
develops muscular strength and endurance, and flexibility activities help maintain range of
motion. Combining these elements produces a more comprehensive fitness program than
emphasizing only one dimension of physical performance.
3. During continuous moderate-intensity exercise lasting 45 minutes, ATP production
increasingly depends on:
A) stored ATP exclusively
B) oxidative metabolism using carbohydrate and fat
C) protein as the only fuel
D) phosphocreatine exclusively
Correct Answer: oxidative metabolism using carbohydrate and fat
,Rationale: Stored ATP and phosphocreatine can support only very brief activity. During
sustained aerobic exercise, mitochondrial oxidative metabolism becomes dominant, using
both carbohydrate and fatty acids. Their relative contributions vary with intensity,
duration, training status, diet, and fuel availability.
4. A sprinter performs an all-out effort lasting only several seconds. Which energy system
contributes most immediately after the small amount of stored ATP begins to decline?
A) Beta-oxidation
B) Protein catabolism
C) Phosphocreatine system
D) Ketone metabolism
Correct Answer: Phosphocreatine system
Rationale: Phosphocreatine rapidly donates phosphate to ADP to regenerate ATP and is
therefore crucial during brief, explosive activity. Its capacity is limited, so longer efforts
increasingly require glycolysis and oxidative metabolism.
5. Exercise intensity increases substantially from an easy jog to a demanding run. What
generally happens to fuel selection?
A) Dependence on carbohydrate tends to increase
B) Fat becomes the only usable fuel
C) Protein becomes the preferred immediate fuel
D) ATP requirements decrease
Correct Answer: Dependence on carbohydrate tends to increase
Rationale: As exercise intensity rises, carbohydrate becomes increasingly important
because it can supply ATP rapidly. Fat remains an important fuel, particularly during
lower-to-moderate intensity and prolonged activity, but it cannot supply ATP rapidly
enough to dominate very high-intensity exercise.
6. During prolonged lower-intensity activity, an adequately fueled body generally derives
a greater proportion of its energy from:
A) vitamins
B) minerals
C) fat
D) water
Correct Answer: fat
Rationale: Fatty acids make an important contribution during prolonged aerobic activity,
particularly at lower-to-moderate intensities. Vitamins, minerals, and water support
metabolism and physiological function but do not provide caloric energy.
, 7. Why is carbohydrate availability especially relevant to endurance performance?
A) Carbohydrate cannot be stored in the body
B) Glycogen provides an accessible carbohydrate reserve for exercising muscle
C) Carbohydrate supplies 9 kcal per gram
D) Carbohydrate eliminates the need for fat metabolism
Correct Answer: Glycogen provides an accessible carbohydrate reserve for exercising
muscle
Rationale: Carbohydrate is stored primarily as glycogen in skeletal muscle and liver.
Muscle glycogen can directly support muscular energy production, while liver glycogen
helps maintain blood glucose. Depletion during prolonged demanding exercise can
contribute to fatigue.
8. An athlete dramatically restricts carbohydrate while maintaining prolonged high-
intensity training. Which consequence is most physiologically plausible?
A) Unlimited glycogen storage
B) Elimination of fatigue
C) Increased vitamin synthesis
D) Reduced glycogen availability that may compromise demanding exercise
performance
Correct Answer: Reduced glycogen availability that may compromise demanding exercise
performance
Rationale: High-intensity exercise relies heavily on carbohydrate metabolism. Severe
carbohydrate restriction can reduce glycogen availability, particularly when recovery
between demanding sessions is incomplete. This does not mean every athlete requires the
same carbohydrate intake; needs vary with training volume, intensity, and goals.
9. Resistance training most directly promotes:
A) loss of all adipose tissue
B) maximal flexibility without stretching
C) improvements in muscular strength and potentially muscle mass
D) elimination of carbohydrate requirements
Correct Answer: improvements in muscular strength and potentially muscle mass
Rationale: Progressive resistance exercise challenges skeletal muscle and stimulates
adaptations that can increase strength, muscular endurance, and, under appropriate
conditions, muscle hypertrophy. Adequate energy, protein, recovery, and progressive
overload support these adaptations.
10. A beginner repeatedly performs the same easy resistance exercise for months without
increasing the challenge. Progress eventually stalls. Which training principle best
explains the need to increase the stimulus?
NUTRITION -PORTAGE | Q&A + DETAILED
RATIONALES
1. A college student begins a fitness program and wants to understand the meaning of
physical fitness. Which description is most appropriate?
A) Absence of all chronic disease regardless of activity level
B) Ability to maintain a low body weight through dietary restriction
C) Capacity to perform only vigorous athletic competition
D) Ability to perform moderate-to-vigorous physical activity effectively while
supporting health and daily function
Correct Answer: Ability to perform moderate-to-vigorous physical activity effectively
while supporting health and daily function
Rationale: Physical fitness describes the capacity to perform physical activity and daily
tasks with adequate endurance, strength, flexibility, and physiological reserve. It is broader
than athletic performance and cannot be determined solely from body weight or absence of
diagnosed disease.
2. Someone wants a balanced exercise program rather than specializing in a single
activity. Which combination best addresses the major components emphasized in a
comprehensive fitness routine?
A) Aerobic activity, resistance training, and flexibility work
B) Stretching, fasting, and protein supplementation
C) Resistance training, calorie restriction, and sleep reduction
D) Aerobic activity, dehydration training, and passive recovery
Correct Answer: Aerobic activity, resistance training, and flexibility work
Rationale: Aerobic exercise develops cardiorespiratory endurance, resistance training
develops muscular strength and endurance, and flexibility activities help maintain range of
motion. Combining these elements produces a more comprehensive fitness program than
emphasizing only one dimension of physical performance.
3. During continuous moderate-intensity exercise lasting 45 minutes, ATP production
increasingly depends on:
A) stored ATP exclusively
B) oxidative metabolism using carbohydrate and fat
C) protein as the only fuel
D) phosphocreatine exclusively
Correct Answer: oxidative metabolism using carbohydrate and fat
,Rationale: Stored ATP and phosphocreatine can support only very brief activity. During
sustained aerobic exercise, mitochondrial oxidative metabolism becomes dominant, using
both carbohydrate and fatty acids. Their relative contributions vary with intensity,
duration, training status, diet, and fuel availability.
4. A sprinter performs an all-out effort lasting only several seconds. Which energy system
contributes most immediately after the small amount of stored ATP begins to decline?
A) Beta-oxidation
B) Protein catabolism
C) Phosphocreatine system
D) Ketone metabolism
Correct Answer: Phosphocreatine system
Rationale: Phosphocreatine rapidly donates phosphate to ADP to regenerate ATP and is
therefore crucial during brief, explosive activity. Its capacity is limited, so longer efforts
increasingly require glycolysis and oxidative metabolism.
5. Exercise intensity increases substantially from an easy jog to a demanding run. What
generally happens to fuel selection?
A) Dependence on carbohydrate tends to increase
B) Fat becomes the only usable fuel
C) Protein becomes the preferred immediate fuel
D) ATP requirements decrease
Correct Answer: Dependence on carbohydrate tends to increase
Rationale: As exercise intensity rises, carbohydrate becomes increasingly important
because it can supply ATP rapidly. Fat remains an important fuel, particularly during
lower-to-moderate intensity and prolonged activity, but it cannot supply ATP rapidly
enough to dominate very high-intensity exercise.
6. During prolonged lower-intensity activity, an adequately fueled body generally derives
a greater proportion of its energy from:
A) vitamins
B) minerals
C) fat
D) water
Correct Answer: fat
Rationale: Fatty acids make an important contribution during prolonged aerobic activity,
particularly at lower-to-moderate intensities. Vitamins, minerals, and water support
metabolism and physiological function but do not provide caloric energy.
, 7. Why is carbohydrate availability especially relevant to endurance performance?
A) Carbohydrate cannot be stored in the body
B) Glycogen provides an accessible carbohydrate reserve for exercising muscle
C) Carbohydrate supplies 9 kcal per gram
D) Carbohydrate eliminates the need for fat metabolism
Correct Answer: Glycogen provides an accessible carbohydrate reserve for exercising
muscle
Rationale: Carbohydrate is stored primarily as glycogen in skeletal muscle and liver.
Muscle glycogen can directly support muscular energy production, while liver glycogen
helps maintain blood glucose. Depletion during prolonged demanding exercise can
contribute to fatigue.
8. An athlete dramatically restricts carbohydrate while maintaining prolonged high-
intensity training. Which consequence is most physiologically plausible?
A) Unlimited glycogen storage
B) Elimination of fatigue
C) Increased vitamin synthesis
D) Reduced glycogen availability that may compromise demanding exercise
performance
Correct Answer: Reduced glycogen availability that may compromise demanding exercise
performance
Rationale: High-intensity exercise relies heavily on carbohydrate metabolism. Severe
carbohydrate restriction can reduce glycogen availability, particularly when recovery
between demanding sessions is incomplete. This does not mean every athlete requires the
same carbohydrate intake; needs vary with training volume, intensity, and goals.
9. Resistance training most directly promotes:
A) loss of all adipose tissue
B) maximal flexibility without stretching
C) improvements in muscular strength and potentially muscle mass
D) elimination of carbohydrate requirements
Correct Answer: improvements in muscular strength and potentially muscle mass
Rationale: Progressive resistance exercise challenges skeletal muscle and stimulates
adaptations that can increase strength, muscular endurance, and, under appropriate
conditions, muscle hypertrophy. Adequate energy, protein, recovery, and progressive
overload support these adaptations.
10. A beginner repeatedly performs the same easy resistance exercise for months without
increasing the challenge. Progress eventually stalls. Which training principle best
explains the need to increase the stimulus?
