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O.1 Understanding cells
Bryum moss plants are made up of tiny units called cells.
The text tells you that bryum moss plants are made up of cells. Cells are the
small, similarly shaped units that can be seen in the micrograph.
Each bryum moss cell is so small that it can be seen only with the
help of a microscope.
The micrograph shows bryum moss cells. This micrograph was taken with th
e help of a microscope, which magnified the tiny cells.
The photograph shows a bryum moss plant as it looks without the help of a
microscope. In the photograph, the individual cells are too small to see.
The organism shown in the micrograph is made up of cells, but th
e organism in the photograph is not.
Both the micrograph and the photograph show bryum moss. The text tells y
ou that bryum moss is made up of cells, so the organisms in both images ar
e made up of cells.
Each bryum moss cell is over 0.37 millimeters long.
The text tells you that the micrograph shows a section of the plant that is 0.
37 millimeters long. You can see many cells in the section, so each cell must
be smaller than 0.37 millimeters. In fact, each bryum moss cell shown in th
e micrograph is only about 50 micrometers, or 0.05 millimeters, long!
Role of cell in organisms:
All organisms are made up of cells. Some organisms are unicellular, or made up of
just one cell. Other organisms are multicellular, or made up of many cells. In all
organisms, cells are the most basic units of structure and function. The structure of
an organism is affected by the way its cells are shaped and organized. Many of
the functions that an organism needs to carry out to stay alive happen inside its
cells. A cell is the smallest unit that can get and use energy, remove waste, and
carry out other processes necessary for life.
In all organisms, cells are the most basic units of structure and function.
The structure of an organism is affected by the way its cells are shaped and
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organized. Many of the functions that an organism needs to carry out to stay
alive happen inside its cells. A cell is the smallest unit that can get and use
energy, remove waste, and carry out other processes necessary for life.
The micrographs below show cells from two different organisms: an amoeba,
which is unicellular, and a hamster, which is multicellular.
Cell division:
All cells come from other cells. New cells are created by a process called cell
division.
To start cell division, a cell grows bigger and makes copies of the parts insid
e it. Then, the cell and its parts separate into two new cells. Each new cell co
ntains the same types of cell parts as the original cell. Later, each of these c
ells may divide again to form more cells.
Multicellular cells:
When a multicellular organism's cells divide, the organism can grow.
Each resulting cell is part of that organism. When a unicellular organism
divides, each resulting cell is a separate unicellular organism.
The bacterium was formed when another bacterium's cell divided.
All cells come from other cells. Unicellular organisms like the bacterium
divide to form new organisms. So, the bacterium formed when another
bacterium's cell divided.
When a rose bush cell divides, it copies its parts and then splits into
two cells.
New cells are created when cells divide. A cell divides by copying its parts an
d then splitting into two cells. So, when a rose bush cell divides, it copies its
parts and then splits in two.
Many scientists have carried out experiments to learn about how cells work.
Together, their discoveries led to the development of cell theory.
Cell theory explains what scientists have observed to be true for all cells.
Cell theory includes three main concepts. Based on what you have learned
about cells,
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i)All organisms are made up of many cells.
ii)Cells are the smallest units of structure and function for organisms.
iii)Most cells come from m other.

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O.1 Understanding cells • Bryum moss plants are made up of tiny units called cells. The text tells you that bryum moss plants are made up of cells. Cells are the small, similarly shaped units that can be seen in the micrograph. • Each bryum moss cell is so small that it can be seen only with the help of a microscope. The micrograph shows bryum moss cells. This micrograph was taken with th e help of a microscope, which magnified the tiny cells. The photograph shows a bryum moss plant as it looks without the help of a microscope. In the photograph, the individual cells are too small to see. • The organism shown in the micrograph is made up of cells, but th e organism in the photograph is not. Both the micrograph and the photograph show bryum moss. The text tells y ou that bryum moss is made up of cells, so the organisms in both images ar e made up of cells. • Each bryum moss cell is over 0.37 millimeters long. The text tells you that the micrograph shows a section of the plant that is 0. 37 millimeters long. You can see many cells in the section, so each cell must be smaller than 0.37 millimeters. In fact, each bryum moss cell shown in th e micrograph is only about 50 micrometers, or 0.05 millimeters, long! Role of cell in organisms: All organisms are made up of cells. Some organisms are unicellular, or made up of just one cell. Other organisms are multicellular, or made up of many cells. In all organisms, cells are the most basic units of structure and function. The structure of an organism is affected by the way its cells are shaped and organized. Many of the functions that an organism needs to carry out to stay alive happen inside its cells. A cell is the smallest unit that can get and use energy, remove waste, and carry out other processes necessary for life. In all organisms, cells are the most basic units of structure and function. The structure of an organism is affected by the way its cells are shaped and organized. Many of the functions that an organism needs to carry out to stay alive happen inside its cells. A cell is the smallest unit that can get and use energy, remove waste, and carry out other processes necessary for life. The micrographs below show cells from two different organisms: an amoeba, which is unicellular, and a hamster, which is multicellular. Cell division: All cells come from other cells. New cells are created by a process called cell division. To start cell division, a cell grows bigger and makes copies of the parts insid e it. Then, the cell and its parts separate into two new cells. Each new cell co ntains the same types of cell parts as the original cell. Later, each of these c ells may divide again to form more cells. Multicellular cells: When a multicellular organism's cells divide, the organism can grow. Each resulting cell is part of that organism. When a unicellular organism divides, each resulting cell is a separate unicellular organism. • The bacterium was formed when another bacterium's cell divided. All cells come from other cells. Unicellular organisms like the bacterium divide to form new organisms. So, the bacterium formed when another bacterium's cell divided. When a rose bush cell divides, it copies its parts and then splits into two cells. New cells are created when cells divide. A cell divides by copying its parts an d then splitting into two cells. So, when a rose bush cell divides, it copies its parts and then splits in two. Many scientists have carried out experiments to learn about how cells work. Together, their discoveries led to the development of cell theory. Cell theory explains what scientists have observed to be true for all cells. Cell theory includes three main concepts. Based on what you have learned about cells, i)All organisms are made up of many cells. ii)Cells are the smallest units of structure and function for organisms. iii)Most cells come from mother. Name: Description: ...
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