3.7a Anaerobic Respiration

Cell Respiration- is the controlled release of energy from organic compounds to form ATP
Energy is needed in the cells for:
– synthesizing large molecules (DNA,RNA,proteins)
– pumping molecules (ions) across membranes by active transport
– moving substances (chromosomes, vesicles) around in the cell
ATP = adenosine triphosphate     ADP = adenosine diphosphate
When ATP is split into ADP and phosphate, energy is released
ATP cannot be absorbed through the plasma membrane, so the cell has to make it’s own supply
Organic compounds containing energy are broken down by enzymes

Data-based Questions: production and consumption of ATP
1a) the volume units are dm3
1b) the mass units is g and kg
2a)
2b)
3) It is possible because large amount of ADP and phosphate aren’t needed
4)

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One thought on “3.7a Anaerobic Respiration

  1. Dave Ferguson says:

    Grade 5 A consistent and thorough understanding of the required knowledge and skills, and the ability to apply them in a variety of situations.

    DBQ mark scheme: ATP, p 89
    1. State the volume units that are shown in the equation. [1]

    dm3

    2. State the mass units that are shown in the equation. [1]

    g & kg

    3. Calculate the mass of ATP produced per dm3 of oxygen. [1]

    = 0.14 kg dm-3

    Length of race/m
    Volume of oxygen consumed in cell respiration during the race/dm3
    Mass of ATP produced/kg
    1500
    36
    4.9
    10,000
    150
    20.4
    42,300
    700
    95.1

    4. Calculate the mass of ATP produced per race in the table. [3]

    5. Explain how it is possible to synthesize such large masses of ATP during races. [2]

    • does not require large amount of ADP+Pi
    • ATP produced in a cyclic process
    • of repeated phosphorylation of same ADP molecules
    • only glucose and oxygen need to be taken in
    • glucose is stored in liver/muscle as glycogen

    6. During a 100 m race, 80 g of ATP is needed but only 0.5 dm3 of oxygen is consumed. Deduce how ATP is being produced. [2]

    • a sprint involves a degree of anaerobic activity.
    • ATP can be produced in the absence of oxygen/anaerobically
    • using glycolysis and fermentation

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