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biomolecule: smallest unit an
organism can be divided into
multicellular: containing more
than one cell
eukaryote: organism made of cells
that have a nucleus
heterotrophic: obtaining nutrition
from compounds that already
exist
organelle: special compartment
inside a eukaryotic cell that
performs a specific function
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From cells to organisms
Human beings are living things.
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They are composed of chemical substances called biomolecules.
They are made up of cells.
They perform the three vital functions of all organisms: nutrition,
reaction to stimuli and reproduction.
Our body is a multicellular organism. It is made up of many cells,
which have different structures and functions.
Human beings are animals, because:
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They are eukaryotes.
Their nutrition is heterotrophic.
Cell theory is based on the following series of principles:
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A cell is the structural and functional unit in all living things.
All our cells come from successive divisions of one initial celr,
fertilised egg cell called the zygote.
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The cell is the basic structural and functional unit of an organism.
The cells in our body come in very different shapes and sizes, but they
all share the same basic structure.
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vesicles that store different
substances.
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cell membrane. A fine layer that
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Cytoplasm.lelly-like substance inside the cell, which contains many
types of organelle and where the majority of the vital chemical
functions take place.
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Nucleus. A structure containing the genetic material with the
necessary information to direct and control the cell's functions.
separates the cell from the outside
environment and allows substances to enter and leave.
organelles w¡th no
membrane, made up
RNA and proteins. Thev..
ardsc¿ttered th rou g hoot
the cytoplasm or are
the rough
Endoplasmic reticulum. A
membrane system that forms
a network of tubules and
bags. There are two types:
Rough. lt has ribosomes
b,tilhe outside of its
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4ri{nrbranes. lt synthesises
*¡d stores proteins.
t'Smooth. lt has no
ribosomes. lt synthesises fats
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j Golgi apparatus. A membranous organelle
formed by flattened stacked pouches
(cisternae). It takes proteins manufactured in
the endoplasmic reticulum to where thgy are
that form
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comolex networks.
networks They
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and
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