Person X decides to eliminate completely all carbohydrates from their diet, eating only proteins. How is glucose generated?

Question

BlackTom AI · Accepted Answer

First, let’s unpack the metabolic context: when carbohydrate intake is eliminated, glucose must be produced endogenously to meet essential needs. The body uses gluconeogenesis, the process that generates glucose from non-carbohydrate precursors.
Option 1 claims glucose is formed 'both from oxoloacetate and pyruvate through glycolysis.' This is misleading because glycolysis is the pathway that breaks down glucose to pyruvate, not a route to create glucose. Glucose synthesis does not occur via glycolysis; it’s the reverse of glycolysis.
Option 2 says 'only from oxoloacetate through gluconeogenesis.' While oxaloacetate is indeed a gluconeogenic substrate, relying on it alone ignores the fact that pyruvate is also a major gluconeogenic precursor. The body can convert pyruvate to oxaloacetate and then to phosphoenolpyruvate, among other steps; thus restricting to only oxaloacetate is incomplete.
Option 3 states 'only from pyruvate through gluconeogenesis.' Pyruvate is a key gluconeogenic substrate, but it is not the sole contributor. In many tissues, pyruvate is converted to oxaloacetate and can contribute to glucose production through multiple gluconeogenic routes. Excluding oxaloacetate as a substrate ignores part of the pathway.
Option 4 reads 'both from oxoloacetate and pyruvate through gluconeogenesis.' This aligns with the biochemistry of gluconeogenesis: both pyruvate and oxaloacetate are important substrates that feed into the gluconeogenic pathway, ultimately yielding glucose. It reflects the network of reactions where pyruvate can be carboxylated to oxaloacetate, and oxaloacetate can be used directly or converted further to phosphoenolpyruvate, among other steps, to end up as glucose.
In summary, while glucogenesis can draw from multiple substrates, the complete and accurate statement recognizes that both pyruvate and oxaloacetate serve as substrates in gluconeogenesis, making option 4 the best representation of glucose generation under carbohydrate deprivation.

Person X decides to eliminate completely all carbohydrates from their diet, eating only proteins. How is glucose generated?

查看解析

登录即可查看完整答案

类似问题

The process of synthesizing glucose from non-carbohydrate sources is called:

In a grazing ruminant, the main source of glucose comes from:

After 1 day fasting

During fasting, when glycogen stores have been depleted, the body begins to synthesise glucose from

The synthesis of glucose from lactate, glycerol, or amino acids is called

Gluconeogenesis is

Some glucose can be synthesised from

During fasting, when glycogen stores have been depleted, the body begins to synthesise glucose from

更多留学生实用工具

考试浏览器助手

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