This question is divided into three parts:
Fungi such as yeast can perform aerobic respiration when oxygen is present.
The rate of aerobic respiration is influenced by environmental conditions, including temperature.
The rate of respiration can be measured using a simple respirometer.
Plan an investigation to determine the effect of temperature on the rate of respiration in a population of active yeast (Saccharomyces cerevisiae) that would allow valid data to be collected.
Details of how to set up the respirometer are not required.
Glycogen is the primary storage carbohydrate in fungi and animals, consisting of highly branched polymers of α\alphaα-glucose.
Give three properties of glycogen that make it highly suitable as a storage molecule in yeast or animal cells.
During the fermentation process, yeast cells secrete the enzyme invertase (sucrase) into the surrounding liquid medium to hydrolyse sucrose.
Explain whether the action of invertase in this scenario is intracellular or extracellular.
