The list shows four metabolic processes.
1 carbon dioxide + water --> glucose + oxygen
2 glucose --> alcohol + carbon dioxide
3 glucose --> lactic acid
4 glucose + oxygen --> carbon dioxide + water
Which of these processes occur in muscles?
A 1 and 2
B 2 and 3
C 3 and 4
D 4 and 1
The graph shows the results of an experiment to investigate the rate of respiration of an organism at different temperatures.
What explains the difference between the rate of respiration at 50 °C and that at 30 °C?
Why does anaerobic respiration in muscles release less energy than aerobic respiration?
A Energy is lost in carbon dioxide.
B Energy is lost in oxygen.
C Energy remains trapped in ethanol.
D Energy remains trapped in lactic acid.
Which word equation represents anaerobic respiration in human muscle?
A glucose → carbon dioxide + ethanol (alcohol)
B glucose → carbon dioxide + lactic acid
C glucose → ethanol (alcohol)
D glucose → lactic acid
Four metabolic reactions are shown.
1 carbon dioxide + water → glucose + oxygen
2 glucose → ethanol + carbon dioxide
3 glucose → lactic acid
4 glucose + oxygen → carbon dioxide + water
Which reactions take place in human cells to release energy?
A 1 and 2
B 1 and 3
C 2 and 4
D 3 and 4
The graph shows the energy released by two animals through respiration as the external temperature changes.
Which conclusion can be drawn from the graph?
A Animals 1 and 2 release the least energy at 23 °C.
B Animal 2 always respires faster than animal 1.
C As the temperature rises, respiration always increases.
D The rate of respiration is the same for both animals at 23 °C.
Four word equations are shown.
P carbon dioxide + water → glucose + oxygen
Q glucose + oxygen → carbon dioxide + water
R glucose → lactic acid
S glucose → alcohol + carbon dioxide
What are the equations for anaerobic respiration in humans and anaerobic respiration in yeast?
Four words are shown below.
alcohol anaerobic sugar yeast
These words can be used in the spaces P, Q, R and S to complete the sentence below.
‘In brewing and bread making, respiration takes place. The micro-organism called
……P……uses ……Q.….. as a source of food. The product of this ……R…… respiration is ……S……
Which combination of words correctly completes the sentences?