microbiology is best defined as: a. study of microorganisms or microbes b. can be found almost everywhere on earth c. study of a diverse group of generally minute, simple life-forms that include bacteria, archea, algae, fungi, protozoa, and viruses 2. which of these is the characteristic of prokaryotic cells? a. both of these b. do not posses true nucleus c. multiply by binary fission 3. phase contrast microscope uses fluorescent dyes and electron. true or false? 4. when specimen appears dark against the surrounding bright viewer field of a microscope, it is/an: a. bright-field microscope b. dark field microscope c. phase contrast microscope
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.
1.
a. study of microorganisms or microbes
b. can be found almost everywhere on earth
c. study of a diverse group of generally minute, simple life-forms that include bacteria, archea, algae, fungi, protozoa, and viruses
2. which of these is the characteristic of prokaryotic cells?
a. both of these
b. do not posses true nucleus
c. multiply by binary fission
3. phase contrast microscope uses fluorescent dyes and electron.
true or false?
4. when specimen appears dark against the surrounding bright viewer field of a microscope, it is/an:
a. bright-field microscope
b. dark field microscope
c. phase contrast microscope
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