10.1 Respiration (Cambridge (CIE) O Level Biology): Flashcards
Exam code: 5090
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- FrontRespiration in Cells
Define respiration.
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Cards in this collection (11)
Define respiration.
The chemical reactions in cells that break down nutrient molecules, such as glucose, to release energy.
Why is respiration not the same as breathing?
Breathing is the movement of air into and out of the body (ventilation).
Respiration is a chemical reaction inside cells that releases energy.
Respiration is a series of chemical reactions that are controlled by .
Respiration is a series of chemical reactions that are controlled by enzymes.
True or False?
Respiration occurs in all living cells.
True.
Respiration takes place in all living cells, with most aerobic respiration occurring in the mitochondria.
True or False?
Energy is made during respiration.
False.
Energy is released during respiration; it is never made, produced or created.
Which processes in the human body require energy released by respiration?
Energy from respiration is used for:
muscle contraction
protein synthesis
cell division
growth
active transport
generation of nerve impulses
maintaining a constant body temperature
Much less energy is released for each glucose molecule broken down than aerobically.
Much less energy is released for each glucose molecule broken down anaerobically than aerobically.
Which indicator is used to measure the rate of respiration in a yeast suspension?
Methylene blue, which changes from blue to colourless as the yeast respires.
The faster the colour change, the faster the rate of respiration.
What happens to the rate of respiration in yeast as temperature increases up to 40 °C?
The rate of respiration increases.
Molecules gain more kinetic energy, so enzymes and substrate collide more frequently.
Why does the rate of respiration in yeast decrease above 40 °C?
The enzymes involved in respiration denature.
The shape of their active site changes, so they can no longer form enzyme-substrate complexes.
True or False?
In the methylene blue experiment, temperature is the independent variable.
True.
Temperature is deliberately changed using water baths, so it is the independent variable.
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