Work in a living organism requires
energy
example (1) of work done by transport substances across membranes
active transport using the sodium-potassium pump in cell membranes
examples (2) of work done by transport substances across membranes
exocytosis of digested bacteria from white blood cells
example (1) of work done by anabolic reactions
synthesis of DNA from nucleotides
example (2) of work done by anabolic reactions
synthesis of protein from amino acids
example (1) of work done by movement
cellular movement of chromosomes via the spindle
example(2) of work done by movement
mechanical contraction of muscles
example of work done by maintaining body temperature
only occurs in mammals and birds
what is the primary source of energy
the sun
which reactions store energy in organic matter
photosynthesis
during photosynthesis which transform of energy occurs
light energy into chemical energy
in photosynthesis, energy transform happens during this process
synthesis of carbohydrates
carbohydrates formed in photosynthesis are used in what processes
used in the synthesis of ATP
OR
combined & modified to form all the usable organic molecules that are essential for all metabolic processes in the plant
which organism carries out photosynthesis
the first organism in a food chain
plants
the purpose of respiration
releases energy from the breakdown of organic molecules
what happens during the process of respiration in an organism
transfer of chemical potential energy from nutrient molecules into a usable energy form that can be used for work
the glucose equation
glucose + oxygen → carbon dioxide + water + energy
C6H1206 + 6 O2 → 6 CO2 + 6 H20 + 2870kJ
definition of autotrophs
organism that are able to synthesise their own usable carbon compounds
the difference between heterotrophs and autotrophs
heterotrophs require premade usable carbon compounds while autotrophs make their own usable carbon compounds through photosynthesis
energy can only be
transformed from one form to another
great example of active transport
sodium-potassium pump
in a potassium pumps, how many sodium and potassium ions are actively moved across the membrane respectively
3 and 2
great example of an energy-requiring reaction
the movement and contraction of muscles also requires substantial amounts of energy