Histology Quiz Prelim 1

What is histology the study of?

• The arrangement of molecules

• The functions of organs

• The tissues of the body

• The structure of cells

Answer explanation

Histology is the study of the tissues of the body. It focuses on the structure, composition, and function of tissues, making 'the tissues of the body' the correct answer, as it directly relates to the field of histology.

What is the primary function of the extracellular matrix (ECM)?

• To store genetic information

• To provide structural support

• To transport nutrients

• To produce energy

Answer explanation

The primary function of the extracellular matrix (ECM) is to provide structural support to cells and tissues, helping to maintain their shape and integrity, which is essential for proper function.

Which fixative is commonly used for light microscopy?

• Osmium tetroxide

• Glutaraldehyde

• Formalin

• Ethanol

Answer explanation

Formalin is the most commonly used fixative for light microscopy as it preserves tissue morphology and cellular details effectively, making it ideal for histological studies.

What is the purpose of staining in histology?

• To preserve tissue structure

• To enhance visibility of tissue components

• To remove excess water

• To fix the tissue

Answer explanation

The primary purpose of staining in histology is to enhance visibility of tissue components, allowing for better observation and analysis under a microscope. This is crucial for identifying different cell types and structures.

Which microscopy technique uses UV light to visualize fluorescent substances?

• Confocal microscopy

• Bright-field microscopy

• Phase-contrast microscopy

• Fluorescence microscopy

Answer explanation

Fluorescence microscopy uses UV light to excite fluorescent substances, allowing visualization of specific components within a sample. This technique is essential for studying cellular structures and functions.

What is the main advantage of electron microscopy over light microscopy?

• It requires less preparation

• It is easier to use

• It provides higher resolution

• It uses visible light

Answer explanation

The main advantage of electron microscopy over light microscopy is that it provides higher resolution. This allows for more detailed imaging of small structures, which is not possible with light microscopy due to its longer wavelength.

What is the primary use of autoradiography?

• To localize newly synthesized macromolecules

• To stain tissues

• To measure cell size

• To visualize cell structures

Answer explanation

Autoradiography is primarily used to localize newly synthesized macromolecules by detecting radioactive isotopes incorporated into these molecules, allowing researchers to visualize their distribution in tissues.

Which technique is used to study specific proteins in tissues?

• Enzyme histochemistry

• Immunohistochemistry

• In situ hybridization

• Cell culture

Answer explanation

Immunohistochemistry is the technique specifically used to detect and visualize proteins in tissue sections using antibodies, making it the correct choice for studying specific proteins.

What does in situ hybridization primarily detect?

• Proteins

• Carbohydrates

• Nucleic acids

• Lipids

Answer explanation

In situ hybridization primarily detects nucleic acids, such as DNA and RNA, by using labeled probes that bind to specific sequences. This technique allows for the localization of these nucleic acids within cells or tissues.

What is the purpose of using a cryostat in histology?

• To stain tissues

• To fix tissues

• To embed tissues in paraffin

• To section frozen tissues

Answer explanation

A cryostat is specifically designed to section frozen tissues, allowing for thin slices to be made for microscopic examination. This is essential in histology for analyzing cellular structures without the need for embedding in paraffin.