During a period of intense exercise, a muscle cell’s energy demands increase significantly. Which of the following statements accurately describes the changes in ATP production and the involvement of different stages of cellular respiration in this scenario?
ATP production relies solely on the electron transport chain, bypassing glycolysis and the Krebs cycle to meet the immediate energy needs.
Glycolysis becomes the primary ATP source, occurring in the cytoplasm, with increased production of pyruvate that is then converted to lactic acid due to the limited availability of oxygen for the Krebs cycle and electron transport chain.
The Krebs cycle is upregulated to maximize ATP production, while glycolysis slows down due to the build-up of ATP from the electron transport chain.
Both the Krebs cycle and electron transport chain cease functioning due to oxygen depletion, and ATP production is solely dependent on the breakdown of fatty acids in the mitochondria.
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Create Free Account Log inThis is a free VCE Units 3 & 4 Biology practice question worth 1 mark, testing your understanding of Cellular respiration key stages. It falls under How are biochemical pathways regulated? in Unit 3: How do cells maintain life?. Submit your answer above to receive instant AI-powered marking and personalised feedback.
In this unit students investigate the workings of the cell from several perspectives. They explore the relationship between nucleic acids and proteins as key molecules in cellular processes. Students analyse the structure and function of nucleic acids as information molecules, gene structure and expression in prokaryotic and eukaryotic cells and proteins as a diverse group of functional molecules. They examine the biological consequences of manipulating the DNA molecule and applying biotechnologies. Students explore the structure, regulation and rate of biochemical pathways, with reference to photosynthesis and cellular respiration. They explore how the application of biotechnologies to biochemical pathways could lead to improvements in agricultural practices. Students apply their knowledge of cellular processes through investigation of a selected case study, data analysis and/or a bioethical issue. Examples of investigation topics include, but are not limited to: discovery and development of the model of the structure of DNA; proteomic research applications; transgenic organism use in agriculture; use, research and regulation of gene technologies, including CRISPR-Cas9; outcomes and unexpected consequences of the use of enzyme inhibitors such as pesticides and drugs; research into increasing efficiency of photosynthesis or cellular respiration or impact of poisons on the cellular respiration pathway. A student-designed scientific investigation related to cellular processes and/or responses to challenges over time is undertaken in either Unit 3 or Unit 4, or across both Units 3 and 4, and is assessed in Unit 4, Outcome 3. The design, analysis and findings of the investigation are presented in a scientific poster format as outlined in the study design.
In this area of study students focus on the structure and regulation of biochemical pathways. They examine how biochemical pathways, specifically photosynthesis and cellular respiration, involve many steps that are controlled by enzymes and assisted by coenzymes. Students investigate factors that affect the rate of cellular reactions and explore applications of biotechnology that focus on the regulation of biochemical pathways.
the main inputs, outputs and locations of glycolysis, Krebs Cycle and electron transport chain including ATP yield (details of biochemical pathway mechanisms are not required)
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