Question
A respirometer is used to measure the oxygen consumption of germinating seeds. The distance that the oil drop moves is measured at 15-minute intervals.
What is the function of chemical X?
A. Absorbs carbon dioxide so the oxygen released by the seeds can be measured
B. Absorbs carbon dioxide so the oxygen absorbed by the seeds can be measured
C. Absorbs oxygen so the carbon dioxide released by the seeds can be measured
D. Absorbs oxygen so the carbon dioxide absorbed by the seeds can be measured
▶️Answer/Explanation
Markscheme
B
Question
Which compound is a waste product of anaerobic respiration in humans?
A. Carbon dioxide
B. Ethanol
C. Lactate
D. Pyruvate
▶️Answer/Explanation
Markscheme
C
Question
Yeast cells, Saccharomyces cerevisiae, were incubated with and without glucose at three different temperatures for a period of four minutes, during which the rate of CO2 production was measured with a CO2 sensor.
What conclusion can be drawn from the results of this experiment?
A. Yeast uses lipids rather than glucose in respiration at low temperatures.
B. Addition of glucose has a greater impact on rates of cell respiration at lower temperatures.
C. Rates of cell respiration increase with temperature.
D. More glucose is produced at higher temperatures.
▶️Answer/Explanation
Markscheme
C