Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
![As
ENRICHMENT CARD
THINGS TO REMEMBER:
A compound microscope like me, is an instrument used to
see organisms or objects that are too small to be seen by
the naked eye. Plant and animal cells, different kinds of
microorganisms and even mineral samples are microscopic
specimens since they are invisible to the eye. A microscope
is needed to see them. The microscope magnifies these
specimens several hundred times or more. The science of
investigating very tiny organisms and small objects using
microscope is called microscopy.
A compound microscope has magnifying parts that make the specimen look
bigger. Lenses, such as the eyepiece or ocular and the objective lenses are the
magnifying parts. There are different objective lenses; Low Power Objective
(LPO) covers a wide field of view, it usually has a 10X magnification; High Power
Objective (HPO) has a magnification of 40X or 43X is ideal for observing very
fine detail and it is usually longer than the LPO and oil immersion objective has
a magnification range between 60x and 100x. The illuminating parts that
regulate the amount from the source are the mirror and diaphragm. The others
are mechanical parts that function as support and for adjusting the different
parts of the microscope.
Kindly answer the questions below; write them on your Activity
Notebook
1. What are the functions of the base and the arm of the microscope?
2. Give and differentiate the types of objectives
3. What are the two functions of the eyepiece?
4. Which part is use to regulate the amount of light passing through the specimen?
5. What holds the slide in place so that it will not move when observing the specimen?
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