Name: _________________________
2.2.1 – 2.2.2 CELL METABOLISM & SOURCES OF ENERGY
WORKSHEET
METABOLISM
 When we speak about metabolism what do we mean?
 What kind of chemical reactions do you think take place in our bodies?
 ________________ (making proteins)
 ________________ (nerve reactions)
 ________________ (energy needed from respiration)
METABOLISM (Cont’d)
 Metabolism describes _____________________________________ in our bodies
 The way our metabolism functions is extremely important as our bodies need to have
________________ and ____________ conditions
 The maintenance of stable conditions in our bodies is called ________________.
WHAT DO YOU THINK WOULD HAPPEN IF…
 There were no reactions to break down sugar in our blood?
 There were no reactions to build new tissues when we get damaged?
 There were no reactions to send signals to your brain that you are touching something hot?
Page 1 of 3
Name: _________________________
CATABOLIC & ANABOLIC REACTIONS
 Reactions that involve breaking big molecules into smaller molecules release energy and are
called ________________ e.g. ________________
 Reactions that involve making bigger molecules out of smaller ones molecules use up energy
and are called ________________ e.g. _________________
CATABOLIC & ANABOLIC (Cont’d)
 Most reactions take place in a number of _________ which need to be _________
__________________ if the cell is to function properly
 ______________ are the most important controllers of cellular reactions
SOURCES OF ENERGY
 The main source of energy for all life is the ______.
 Certain pigments such as ______________________ can absorb light.
SOURCES OF ENERGY (Cont’d)
 When they absorb light they use it to form the ____________________________ in bio
molecules such as carbohydrates.
 Remember photosynthesis is the way ___________________________________ (glucose –
which is a carbohydrate)
Page 2 of 3
Name: _________________________
CELLULAR ENERGY
 This is the energy released by the ______________________________________
 When bio molecules such as carbohydrates are broken down the bonds are broken and
_____________________________________.
 Some of this energy is ________________________ and the rest is ___________
IN SUMMARY
 Photosynthesis in Plants builds up molecules with
__________________ ___________ (glucose)
 Respiration breaks down glucose and
________________ this energy from the
__________
 This is how plants provide energy from the sun for
everything else on earth!
SYLLABUS
You should be able to do the following for Cell Metabolism:
 Define the term: metabolism.
 State that solar energy is source of energy on Earth.
 State that cellular energy sourced from chemical energy in ATP
END
Page 3 of 3