A researcher is investigating the impact of varying environmental conditions on the cellular respiration rate of Saccharomyces cerevisiae (baker’s yeast) in a bioreactor. The bioreactor is equipped with sensors to continuously monitor temperature, dissolved oxygen concentration, and glucose concentration. Initially, the yeast culture is maintained at $30\degree C$, with a dissolved oxygen concentration of $80\%$ saturation, and a glucose concentration of \$5 g/L$. Over a 2-hour period, the researcher gradually decreases the dissolved oxygen concentration to $5\%$ saturation while simultaneously increasing the temperature to $45\degree C$. The glucose concentration is maintained at \$5 g/L$ throughout the experiment.
Discuss how the observed changes in cellular respiration rate are influenced by the simultaneous alterations in oxygen concentration and temperature. Your response should address the specific effects of each factor, the potential for synergistic or antagonistic interactions, and the limitations imposed by maintaining a constant glucose concentration. Deduce the most likely limiting factor at the end of the 2-hour period.
Marking your answer...
This may take a few seconds
Sign up for free to see your full marking breakdown and personalised study recommendations.
Create Free Account Log inThis is a free VCE Units 3 & 4 Biology practice question worth 7 marks, testing your understanding of Cellular respiration rate factors. 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 factors that affect the rate of cellular respiration: temperature, glucose availability and oxygen concentration
All free, all instant AI marking.
State **three** factors that directly influence the rate of cellular respiration within a cell.
A biotechnology company is engineering yeast strains to optimize ethanol production from cornstarch. Explain how manipulating temperature an…
A researcher is investigating the effect of different environmental conditions on the rate of cellular respiration in isolated mitochondria.…
Which of the following factors, when increased, would generally lead to an *increase* in the rate of cellular respiration, assuming other fa…
A scientist is studying the effect of different glucose concentrations on the rate of cellular respiration in yeast cells. The cells are gro…
Which of the following factors, when increased, would be expected to increase the rate of cellular respiration in most cells, assuming other…
StudyPulse has thousands of VCE Biology questions with full AI feedback, mark breakdowns, progress tracking, and study notes across every Key Knowledge point including Cellular respiration rate factors.
