16 Questions
What is the cell theory?
The cell theory states that a cell is the basic unit of life, all living organisms are made up of cells, and new cells arise only from preexisting cells.
What technological advance was necessary to discover the existence of cells?
Invention of the microscope
What is the fundamental unit of life?
The cell
What are eukaryotic cells compared with prokaryotic cells?
Eukaryotic cells have a true nucleus and membrane-bound organelles, while prokaryotic cells do not.
What does the cell theory state about the origin of new cells?
New cells arise only from preexisting cells.
What is the function of the plasma membrane?
It regulates the passage of substances into and out of the cell.
What is the size of a micrometer in relation to a millimeter?
1/1,000 of a millimeter (mm)
What is the approximate size of a human egg cell?
Around 100 μm
What limits the size of cells?
Surface area to volume ratio
What is the function of a compound light microscope?
To magnify objects using light rays passing through the object
What type of microscope provides a three-dimensional view of the surface of an object?
Scanning electron microscope
What are the two classifications of living cells based on their internal organization?
Eukaryotes and prokaryotes
What are the three basic principles of cells observed under a microscope?
All living things are composed of cells, a single cell is the smallest unit that exhibits all the characteristics of life, all cells come only from preexisting cells
What are the three basic structural components of nearly every eukaryotic cell?
A plasma membrane, a nucleus, cytoplasm
What is the general term for the 'core' of a eukaryotic cell?
Nucleus
What is the outer covering of a cell called?
Plasma membrane
Explore the fundamental concepts of cell biology with this lecture, covering the structure and functions of eukaryotic and prokaryotic cells, the plasma membrane, the nucleus, endomembrane system, cell junctions, metabolism, and energy reactions.
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