This question is divided into three parts:
Anaerobic respiration in yeast cells produces carbon dioxide gas.
The rate of anaerobic respiration is influenced by environmental conditions, including temperature.
The rate of carbon dioxide production can be measured using a gas syringe connected to a reaction vessel.
Plan an investigation to determine the effect of temperature on the rate of anaerobic respiration in a single strain of yeast (Saccharomyces cerevisiae\textit{Saccharomyces cerevisiae}Saccharomyces cerevisiae) that would allow valid data to be collected.
Details of how to prepare the yeast suspension are not required.
Glycogen is the primary storage carbohydrate in animal cells, consisting of highly branched polymers of α\alphaα-glucose.
Give three properties of glycogen that make it highly suitable as a storage molecule in animal skeletal muscle cells.
Hydrogen peroxide is a toxic byproduct of metabolism that is broken down in liver cells by the enzyme catalase.
Explain whether the action of catalase is intracellular or extracellular.
16 exam-style questions on OCR A A Level Biology Planning. Each one has a worked solution and a mark scheme showing where the marks go.