Microscopy

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Questions and Answers

Which type of microscope uses electrons to visualize objects?

C - Scanning Electron Microscopy

A - Light Microscopy

B - Transmission Electron Microscopy (correct)

D - Fluorescence Microscopy

What is the purpose of an extracellular layer in cells?

To allow adjacent cells to communicate

To visualize dead biological specimens

To strengthen cells and bind them together (correct)

To distinguish two separate points

What is the definition of resolution in microscopy?

The ability to distinguish two separate points

The ability to look at very small objects

The measurement of image sharpness (correct)

The ability to visualize living specimens

Which type of microscope has higher resolution?

B - Transmission Electron Microscopy Signup and view all the answers

What happens to the image when a microscope has low resolution?

The image becomes blurry Signup and view all the answers

What is the main difference between Light Microscopy and Electron Microscopy?

The cost Signup and view all the answers

What is the purpose of cell-cell connections?

To allow adjacent cells to communicate Signup and view all the answers

What is the function of the extracellular layer in cells?

To strengthen cells and bind them together Signup and view all the answers

What is the purpose of resolving power in microscopy?

To distinguish two separate points Signup and view all the answers

What is the definition of resolution in microscopy?

The measurement of image sharpness Signup and view all the answers

Which of the following is NOT a function of the extracellular matrix (ECM)?

Metastasis of cancerous cells Signup and view all the answers

What is the main protein fiber found in the extracellular matrix (ECM)?

Collagen Signup and view all the answers

What is the function of tight junctions between animal cells?

To form a watertight seal between cells Signup and view all the answers

Which type of cell junction is common in epithelial and muscle tissue?

Desmosomes Signup and view all the answers

In plant cells, how are adjacent cells connected?

Plasmodesmata Signup and view all the answers

Which of the following is NOT a type of cell adhesion protein?

Collagen Signup and view all the answers

What is the main function of gap junctions between animal cells?

Cell communication Signup and view all the answers

What is the main function of desmosomes between animal cells?

Structural support Signup and view all the answers

Which of the following is a correct statement about cell-cell attachments in eukaryotic cells?

Cadherins bind adjacent cells together in desmosomes Signup and view all the answers

Which of the following is NOT a function of the extracellular matrix (ECM)?

Metastasis of cancerous cells Signup and view all the answers

Study Notes

Microscopy

Electron microscopes use electrons to visualize objects, providing higher resolution than light microscopes.
Resolution in microscopy refers to the minimum distance between two points that can still be distinguished as separate.
Electron microscopes have higher resolution than light microscopes due to the shorter wavelength of electrons compared to light.
Low resolution in a microscope results in a blurry or indistinct image.
The main difference between Light Microscopy and Electron Microscopy is the type of illumination used: light vs. electrons.

Cell-Cell Connections and Extracellular Matrix

The extracellular layer in cells serves as a supporting structure, regulates the movement of molecules, and provides mechanical strength.
The purpose of cell-cell connections is to facilitate communication and adhesion between adjacent cells.
The main protein fiber found in the extracellular matrix (ECM) is collagen.
Tight junctions between animal cells function to prevent the leakage of molecules between cells.
Gap junctions between animal cells allow for the direct exchange of molecules between cells.
Desmosomes between animal cells function to hold cells together and provide mechanical strength.
In plant cells, adjacent cells are connected through plasmodesmata.
Adherens junctions are common in epithelial and muscle tissue.

Functions of Extracellular Matrix

The extracellular matrix (ECM) provides structural support, regulates cell behavior, and serves as a reservoir for signaling molecules.
The ECM does not function as a hormone-producing organ.