20 Questions
What is the method used for observing cells under a microscope in the 17th century?
Light microscopy
Which type of microscopy is used to study unstained specimens under brightfield?
Phase-contrast microscopy
What is the ratio used to compare the surface area to the volume of a cell?
Surface-to-volume (S-to-V) ratio
Which type of electron microscopy is used to study frozen-hydrated specimens at cryogenic temperatures?
Cryo-EM (Cryo-electron microscopy)
Who drew the first representation of cells in 1665?
Robert Hook
What is the function of villi in the small intestine?
To increase the surface area for absorption of nutrients
Which of the following is a characteristic of prokaryotic cells?
No nucleus
What is the main function of the extracellular matrix (ECM) in animal cells?
Strengthens tissues and transmits external signals to cells
What is the general function of plasma membrane in biological cells?
A selective barrier that allows sufficient passage of oxygen, nutrients, and waste
What is the function of root hairs in plants?
To increase surface area for absorbing water and minerals
What is the main advantage of cryo-electron microscopy (Cryo-EM) over traditional TEM?
Higher resolution and better preservation of sample structure
In terms of cell size, why is it advantageous for cells to have a high surface-to-volume (S-to-V) ratio?
Facilitates efficient exchange of materials with the environment
Which microscopy technique is best suited for studying unstained specimens under brightfield?
Light microscopy
What is the main limitation of using light microscopy to study cells?
Limited resolution for observing subcellular structures
Why are electron microscopes preferred for studying subcellular structures over light microscopes?
Electron microscopes have shorter wavelengths, enabling higher resolution imaging
What is the main function of the glycocalyx in animal cells?
Strengthens tissues and transmits external signals to the cell
Which organelle is responsible for producing energy in both plant and animal cells?
Mitochondria
What is the main function of root hairs in plants?
Increased surface area for absorbing water and minerals
Which type of cell junction forms watertight seals between two cells?
Tight junctions
What is the function of the endomembrane system in eukaryotic cells?
Internal transport and compartmentalization
Test your knowledge about cell fractionation, observation methods, cell size, and scale, as well as the structure and function of cells and organelles. This quiz covers topics such as cell fractionation techniques, microscopic observation methods, and the historical development of microscopy.
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