Lesson 4
Metabolism and Energy of Cell
,Metabolism
• Al the living components require energy to carryout living processe
• cells need energy to grow and reproduce, but even non growing ce
need energy simply for the existence and the maintenance of the c
• Cells may gain energy in many forms.
• But it may use energy in another form.
• Therefore cells have mechanisms that convert/ transform energy
from one form to another.
,Metabolism
• The sun is the ultimate source of almost all the energy that powers life.
• Plants and other photosynthetic organisms capture about 0.01% of the
sun’s energy that reaches Earth.
• Photosynthetic organisms convert radiant/light energy to chemical ener
in the bonds of organic molecules (Glucose molecules initially).
• This chemical energy becomes available to organisms through the proce
of cellular respiration.
• In cellular respiration, organic molecules are broken apart and their ene
is converted to more immediately usable forms (Phosphate bonds in ATP
, Metabolism
• There are chemical reactions that occur in organisms.
• Whole sum of these chemical reactions/activities which are occurr
in an organism are termed as metabolism.
• This came from the from the Greek metabole which means change
• Metabolism is an emergent property of life as it that arises from
orderly interactions between molecules
• These chemical reactions that enable an organism to carry on its
activities and to possess its living characteristics such as growth,
movement, reproduction, responding to stimuli etc.
• There are two main types of metabolism - anabolism and catabolis
Metabolism and Energy of Cell
,Metabolism
• Al the living components require energy to carryout living processe
• cells need energy to grow and reproduce, but even non growing ce
need energy simply for the existence and the maintenance of the c
• Cells may gain energy in many forms.
• But it may use energy in another form.
• Therefore cells have mechanisms that convert/ transform energy
from one form to another.
,Metabolism
• The sun is the ultimate source of almost all the energy that powers life.
• Plants and other photosynthetic organisms capture about 0.01% of the
sun’s energy that reaches Earth.
• Photosynthetic organisms convert radiant/light energy to chemical ener
in the bonds of organic molecules (Glucose molecules initially).
• This chemical energy becomes available to organisms through the proce
of cellular respiration.
• In cellular respiration, organic molecules are broken apart and their ene
is converted to more immediately usable forms (Phosphate bonds in ATP
, Metabolism
• There are chemical reactions that occur in organisms.
• Whole sum of these chemical reactions/activities which are occurr
in an organism are termed as metabolism.
• This came from the from the Greek metabole which means change
• Metabolism is an emergent property of life as it that arises from
orderly interactions between molecules
• These chemical reactions that enable an organism to carry on its
activities and to possess its living characteristics such as growth,
movement, reproduction, responding to stimuli etc.
• There are two main types of metabolism - anabolism and catabolis
