1.1.2 Functionof Life
Metabolism -
all the enzyme-catalysedreactions occuring in a cell
e.g respiration
Reproduction -
productionofsexual/asexual activity
Homeostatis -
maintain & regulate internal condition within tolerable
limits
Growth -
Permanent increase in size
Response -
the ability to response to external/internal stimuli in their
to increase
environment chance of survival
Excretion -
disposal of metabolic waste e.g carbon dioxide
Nutrition -
acquire energy & nutrients for growth & development
by absorbing organic matter or
synthesis organic molecule
Y
for unit multicellular organisms
Paramecium & Chollera
Paramecium -
unicellular commonly foundin fresh water
-
50-320 um
Chlorella -
unicellular
-
12 to 10 mm)
, Formation of Stem Cells
At
-> fertilisation the diploidsingle a
cell called zygote begin dividing.
->
Once becomese 16 to 32 cells -- calledmould
After
-> 6 more days, the mould becomes a hollow ball of cells
called blastocyst. The outer cell (trophoblast) will become the placenta,
the inner cell mass will become the embryo
Morphogens
Morphogens -chemicals releasedby
special cells that
gives the cell
form"
As secreted, there
morphogens are
+
is a
higher concentration of
morphogens near the secreting
cells & lower concentration further
away. This concentration
is detectedby receptors
gradient
on the embryo cells & the
respondaccordingly. Forming
parts of the body
diffrent
Metabolism -
all the enzyme-catalysedreactions occuring in a cell
e.g respiration
Reproduction -
productionofsexual/asexual activity
Homeostatis -
maintain & regulate internal condition within tolerable
limits
Growth -
Permanent increase in size
Response -
the ability to response to external/internal stimuli in their
to increase
environment chance of survival
Excretion -
disposal of metabolic waste e.g carbon dioxide
Nutrition -
acquire energy & nutrients for growth & development
by absorbing organic matter or
synthesis organic molecule
Y
for unit multicellular organisms
Paramecium & Chollera
Paramecium -
unicellular commonly foundin fresh water
-
50-320 um
Chlorella -
unicellular
-
12 to 10 mm)
, Formation of Stem Cells
At
-> fertilisation the diploidsingle a
cell called zygote begin dividing.
->
Once becomese 16 to 32 cells -- calledmould
After
-> 6 more days, the mould becomes a hollow ball of cells
called blastocyst. The outer cell (trophoblast) will become the placenta,
the inner cell mass will become the embryo
Morphogens
Morphogens -chemicals releasedby
special cells that
gives the cell
form"
As secreted, there
morphogens are
+
is a
higher concentration of
morphogens near the secreting
cells & lower concentration further
away. This concentration
is detectedby receptors
gradient
on the embryo cells & the
respondaccordingly. Forming
parts of the body
diffrent
