The document defines key cellular biology terms including cell theory, differentiation, emergent property, growth, homeostasis, magnification, metabolism, paramecium, response, scale bar, Stargardt's disease, stem cell, surface area to volume ratio, system, and tissue. Cell theory states that all organisms are composed of cells, cells are the smallest independent unit of life, and all cells come from pre-existing cells. Differentiation is the alteration of a cell's morphology and physiology through gene expression changes. An emergent property is a characteristic of a system that results from the interaction of its components and makes the whole greater than the sum of its parts.

1.
Cell theory
1.1 Introduction to Cells
Cells & Biomolecule
Theory that states that all
organisms are composed of
cells, cells are the smallest
independent unit of life and
that all cells come from pre-
existing cells.
Differentiation
1.1 Introduction to Cells
Cells & Biomolecule
The alteration of a cell’s
morphology and physiology
through changes in gene
expression.
Emergent property
1.1 Introduction to Cells
Cells & Biomolecule
A property of a system that
emerges from the
interaction of the elements
of the system, where the
whole is more complex than
the sum of its parts.
Growth
1.1 Introduction to Cells
Cells & Biomolecule
An increase in physical size.

2. Homeostasis
1.1 Introduction to Cells
Cells & Biomolecule
The process in which an
organism regulates activities
within cells and their bodies
to keep conditions stable.
Magnification
1.1 Introduction to Cells
Cells & Biomolecule
Ratio of image size to actual
size.
Metabolism
1.1 Introduction to Cells
Cells & Biomolecule
The sum of all of the
chemical reactions that
occur within an organism or
within a cell.
Paramecium
1.1 Introduction to Cells
Cells & Biomolecule
Genus of single-celled
ciliated organisms that show
all signs of life.

3. Response
1.1 Introduction to Cells
Cells & Biomolecule
In behavioural science, the
behaviour that is the
consequence of a stimulus.
Scale bar
1.1 Introduction to Cells
Cells & Biomolecule
A means of visually
indicating the magnification
of an image.
Stargardt’s disease
1.1 Introduction to Cells
Cells & Biomolecule
A degenerative eye disease
that has been the target of
stem cell therapy.
Stem cell
1.1 Introduction to Cells
Cells & Biomolecule
A relatively undifferentiated
cell that can give rise to
other types of cells and
retains the ability to divide.

4. Surface area to
volume ratio
1.1 Introduction to Cells
Cells & Biomolecule
A variable that decreases as
cells grow, so that it sets a
limit to the size of cells.
System
1.1 Introduction to Cells
Cells & Biomolecule
A level of organization that
emerges due to the
interaction of elements.
Tissue
1.1 Introduction to Cells
Cells & Biomolecule
A group of cells with a
common function and
structure.