The molecule that serves as the major source of readily available fuel for cellular respiration is ______
acetyl CoA
protein
glucose
fat
The Correct Answer is C
A. acetyl CoA: Acetyl CoA is a critical intermediate in cellular respiration that enters the Krebs cycle. However, it is not the primary fuel source but rather a product derived from the breakdown of carbohydrates, fats, or proteins.
B. protein: Proteins can be used for energy when carbohydrates and fats are scarce, but they are primarily reserved for structural and functional roles such as enzyme production and tissue repair. Their breakdown for energy is less efficient and not the main source of fuel.
C. glucose: Glucose is the body’s preferred and most readily available fuel for cellular respiration. It undergoes glycolysis, the Krebs cycle, and oxidative phosphorylation to produce ATP efficiently, making it the main energy substrate under normal conditions.
D. fat: Fats provide a large energy reserve and yield more ATP per molecule than glucose, but they must undergo beta-oxidation before entering respiration pathways. They are slower to mobilize and not considered the immediate source of fuel.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. ceruminous:Ceruminous glands are modified sweat glands located in the ear canal that produce earwax (cerumen), not scalp oil.
B. sebaceous:Sebaceous glands are associated with hair follicles and secrete sebum, an oily substance that lubricates the hair and skin, helping to maintain moisture and provide a protective barrier.
C. apocrine sweat:Apocrine sweat glands are found in specific areas such as the axillae and groin. They secrete a thicker, milky sweat, usually in response to stress or hormonal signals, and do not produce scalp oil.
D. mammary:Mammary glands are specialized sweat glands that produce milk. They are not involved in producing scalp oil.
E. merocrine sweat:Merocrine (eccrine) sweat glands are widely distributed and secrete a watery sweat primarily for thermoregulation, not for lubricating hair or skin.
Correct Answer is A
Explanation
A. axillary and pubic areas:Apocrine glands are concentrated in the axillae, areolae, and pubic regions. They become active during puberty and release a thicker secretion that can produce body odor when decomposed by bacteria.
B. soles of the feet:The soles contain numerous eccrine sweat glands, which function in thermoregulation, but apocrine glands are not typically found here.
C. palms of the hands:Like the soles, the palms are rich in eccrine sweat glands for cooling, but they lack apocrine glands.
D. both A and B:Apocrine glands are not present in the soles of the feet, only in axillary and pubic regions.
E. both B and C:Neither the soles nor the palms contain apocrine glands; they only have eccrine sweat glands.
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