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Campbell Biology Chapter 6: A Tour of the Cell | Questions And Answers Latest {} A+ Graded | 100% Verified
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Campbell Biology Chapter 6: A Tour of the Cell | Questions And Answers Latest {2024- 2025} A+ Graded | 100% Verified

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  • August 20, 2024
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Campbell Biology Chapter 6: A Tour of the Cell | Questions And Answers Latest {2024-
2025} A+ Graded | 100% Verified


light microscope (LM) - visible light is passed through the specimen and then through glass lenses



organelles - the membrane-enclosed structures within eukaryotic cells



electron microscope (EM) - focuses a beam of electrons through the specimen or onto its surface



scanning electron microscope (SEM) - the electron beam scans the surface of the sample, usually coated
with a thin film of gold



useful for detailed study of the topography of a specimen



transmission electron microscope (TEM) - used to study the internal structure of cells



aims an electron beam through a very thin section of the specimen



cell fractionation - for studying cell structure and function



takes cells apart and separates major organelles and other subcellular structures from one another



plasma membrane - cells bounded by a selective barrier



cytoso - jellylike substance in which subcellular components are suspended



eukaryotic cell - most of DNA is in the nucleus, bounded by a double membrane



prokaryotic cell - the DNA is concentrated in a region that is not membrane-enclosed called the
NUCLEOID

, cytoplasm - the interior of either type of cell



plasma membrane - the boundary of every cell, functions as a selective barrier that allows passage of
enough oxygen, nutrients, and wastes to service the entire cell



nucleus - contains most of the genes in the eukaryotic cell (some genes can be in mitochondria and
chloroplasts)



nuclear envelope - encloses the nucleus, separating its contents from the cytoplasm



nuclear lamina - nuclear side of the envelope is lined with nuclear lamina, a netlike array of protein
filaments that maintains the shape of the nucleus by mechanically supporting the nuclear envelope



chromosomes - in the nucleus the DNA is organized into discrete units

structures that carry genetic info



nucleolus - a prominent structure within the nondividing nucleus, which appears through the electron
microscope as a mass of densely strained granules and fivers adjoining part of the chromatin



ribosomes - complexes made of ribosomal RNA and protein, are the cellular components that carry out
protein synthesis



endomembrane system - part of eukaryotic cell; includes the nuclear envelope, the endoplasmic
reticulum, the golgi, lysosomes, and various kinds of vesicles and vacuoles, and the plasma membrane



vesicles - sacs made of membrane



membrane of this system are related either through direct physical continuity or by the transfer of
membrane segments as tiny vesicles

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