In the absence of carbohydrates such as glucose, other biological macromolecules such as lipids and proteins can be catabolized to obtain energy.

Question

BlackTom AI · Accepted Answer

The statement asks whether, when carbohydrates such as glucose are unavailable, other biological macromolecules like lipids and proteins can be catabolized to obtain energy.
First, consider the fundamental energy pathways: carbohydrates are readily catabolized via glycolysis and the citric acid cycle, but when glucose is scarce, cells can switch to alternative substrates.
Lipids (fats) are broken down into fatty acids and glycerol; fatty acids undergo beta-oxidation to acetyl-CoA, which feeds into the Krebs cycle to produce ATP. This provides a major energy source, especially during fasting or prolonged exercise.
Proteins, when mobilized, are degraded into amino acids; some amino acids can be converted into intermediates that enter the Krebs cycle or gluconeogenesis, supplying energy or enabling glucose production. Although this is not the primary pathway for energy, it can occur under metabolic stress or starvation.
Therefore, the claim that lipids and proteins can be catabolized to obtain energy in the absence of glucose is true. The statement correctly reflects the metabolic flexibility of organisms to utilize alternative macromolecules for energy.
A common misconception would be to think energy extraction is exclusively from carbohydrates; however, the body has mechanisms to oxidize fats and certain amino acids to support ATP production when glucose is limited. This is consistent with the broader understanding of catabolic pathways and energy homeostasis.
Another potential pitfall is to think that proteins are only used for structure or enzymes; while that is true under normal conditions, proteolysis and amino acid catabolism do contribute to energy production when needed, albeit with amino acid deamination and entry into the Krebs cycle or gluconeogenesis.
In summary, in the absence of glucose, lipids and, to a lesser extent, proteins can be catabolized to yield energy, making the statement true.

In the absence of carbohydrates such as glucose, other biological macromolecules such as lipids and proteins can be catabolized to obtain energy.判断题

类似问题

Question at position 10 In which example would a person be most likely to gain fat? RQ= 0.84 and FQ= 0.84RQ= 0.90 and FQ= 0.70RQ= 0.90 and FQ= 1.0RQ= 1.0 and FQ= 1.0

Anabolism results from _ of complex substances in the cell from _.

Catabolic reactions build complex molecules.

Due to the intensity of the workout, HIIT can elevate your metabolism for hours after exercise.

位置1的问题 Multiple Choice: Energy is acquired from a process called: a. Metabolismb. Skin turgorc. Fighting diseased. Clotting

Which one of the following best describes an amphibolic pathway? Hint: "Amphi" refers to "both sides."

Bacterial and archaeal species exhibit more diverse processes than any other group of organisms.

Which of the following is NOT true of a several day fast (no food)?

更多留学生实用工具

智能学习助手

风格化写作助手

论文查重助手

文献引用助手

课堂转译助手

课堂笔记助手

Quiz搜索助手

学校历年真题

智能刷题助手

智能匹配练习

希望你的学习变得更简单