History and Microscopy BMED

What caused the most devastating diseases throughout human history?

A) Microorganisms

B) Environmental toxins

C) Nutritional deficiencies

D) Magic

A) Microorganisms

What was Ehrlich's successful compound called?

A) Arsenic-X

B) Chemicin

C) Salvarsan (Compound 606)

D) Penicillin

C) Salvarsan (Compound 606)

What concept did Ehrlich propose to minimize drug side effects?

A) "Magic bullet" targeted therapy (Zauberkugel)

B) Weak toxin exposure

C) Blood cleansing

D) Genetic vaccines

A) "Magic bullet" targeted therapy (Zauberkugel)

What broader fields emerged due to the work of Pasteur and Koch?

A) Neurology and psychiatry

B) Microbiology and immunology

C) Physics and chemistry

D) Genetics and biotechnology

B) Microbiology and immunology

Who first observed microorganisms ("animalcules")?

A) Robert Koch

B) Louis Pasteur

C) Joseph Lister

D) Antonie van Leeuwenhoek

D) Antonie van Leeuwenhoek

In what year did Leeuwenhoek first describe microorganisms?

A) 1874

B) 1774

C) 1574

D) 1674

D) 1674

Why did Leeuwenhoek's discoveries initially have little impact?

A) His writings were destroyed

B) The significance wasn't understood until centuries later

C) He wasn't respected

D) His microscopes were inaccurate

B) The significance wasn't understood until centuries later

The early debate surrounding fermentation centered on whether it was...

A) Caused by chemical decomposition or microorganisms from the air

B) Impossible to study

C) A magical process

D) Only caused by heat

A) Caused by chemical decomposition or microorganisms from the air

Pasteur proved microorganisms caused fermentation using what tool?

A) Swan-necked flasks

B) Sealed metal tubes

C) Electron microscopes

D) Petri dishes

A) Swan-necked flasks

What process did Pasteur discover to prevent spoilage?

A) Pasteurization

B) Filtration

C) Oxygen removal

D) Sterilization

A) Pasteurization

What major theory did Pasteur propose?

A) Vital force theory

B) Planetary germination theory

C) Germ theory of disease

D) Theory of spontaneous generation

C) Germ theory of disease

Which surgeon developed antiseptic surgery based on Pasteur's ideas?

A) Lister

B) Koch

C) Ehrlich

D) Fleming

A) Lister

What antiseptic did Lister use?

A) Alcohol

B) Phenol (carbolic acid)

C) Bleach

D) Iodine

B) Phenol (carbolic acid)

What famous mouthwash was named after Lister?

A) Listerine

B) Colgate Rinse

C) Peroxyl

D) Scope

A) Listerine

What major scientific concept did Robert Koch introduce?

A) Pasteurization

B) Koch's postulates

C) Microbial evolution theory

D) Synthetic vaccines

B) Koch's postulates

Koch's postulates required isolating a microorganism from...

A) A healthy person

B) The air

C) A sick patient or animal

D) A laboratory sample

C) A sick patient or animal

Which disease did Koch famously study?

A) Syphilis

B) Malaria

C) Cholera

D) Tuberculosis (Mycobacterium tuberculosis)

D) Tuberculosis (Mycobacterium tuberculosis)

What diagnostic test did Koch and Ehrlich develop?

A) CBC

B) X-ray imaging

C) Tuberculin test

D) Antibiotic assay

C) Tuberculin test

Who is known as the father of chemotherapy?

A) Ehrlich

B) Jenner

C) Pasteur

D) Koch

A) Ehrlich

What disease did Ehrlich target when testing hundreds of synthetic compounds?

A) Tuberculosis

B) Syphilis (Treponema pallidum)

C) Typhus

D) Cholera

B) Syphilis (Treponema pallidum)

Which of the following best describes a direct microscopic examination?

A) Observation of stained slides only

B) Immediate visualization of microorganisms from a sample without staining

C) Use of electron microscopy

D) Use of fluorescent dyes only

B) Immediate visualization of microorganisms from a sample without staining

Differential stains are characterized by their ability to:

A) Stain all cells the same color

B) Distinguish types of microorganisms based on staining reactions

C) Identify viruses specifically

D) Work only on acid-fast bacteria

B) Distinguish types of microorganisms based on staining reactions

Acid-fast staining is primarily used to detect:

A) Protozoa

B) Fungi

C) Mycobacteria

D) Gram-negative rods

C) Mycobacteria

Fluorescent stains are particularly useful because they:

A) Increase cell size

B) Specifically bind to target structures producing bright emission

C) Replace electron microscopy

D) Do not require excitation light

B) Specifically bind to target structures producing bright emission

Which of the following is an example of a fluorescent dye?

A) Crystal violet

B) Safranin

C) FITC (fluorescein isothiocyanate)

D) Methylene blue

C) FITC (fluorescein isothiocyanate)

In brightfield microscopy, image formation primarily relies on which mechanism?

A) Emission from the specimen

B) Tyndall scattering

C) Differential absorption and transmission of light

D) Electron diffraction

C) Differential absorption and transmission of light

Ideal darkfield background color?

A) White

B) Light gray

C) Green

D) Black

D) Black

Fluorescence microscopy advantage:

A) No phototoxicity

B) Molecular specificity

C) Nanometer resolution

D) No optical filters

B) Molecular specificity

Tissue autofluorescence usually:

A) Increases background

B) Improves selectivity

C) Reduces Stokes shift

D) Increases resolution

A) Increases background

Emission filter does what?

A) Passes emission light

B) Blocks emission

C) Doubles intensity

D) Changes refractive index

A) Passes emission light

Excitation filter function:

A) Pass emission

B) Select excitation band

C) Block scattered light

D) Increase aperture

B) Select excitation band

Phase-contrast main advantage:

A) TEM-like resolution

B) View living cells

C) No halos

D) 3D topography

B) View living cells

Essential for phase-contrast:

A) Excitation filter

B) Field diaphragm

C) Condenser annulus

D) Photomultiplier tubes

C) Condenser annulus

Phase-contrast converts:

A) Phase to frequency

B) Phase to intensity

C) Amplitude to wavelength

D) Intensity to phase

B) Phase to intensity

Key accessory for darkfield?

A) Phase annulus

B) Darkfield condenser

C) Emission filter

D) Fluorescence cube

B) Darkfield condenser

Contrast in darkfield comes from:

A) Absorption

B) Emission

C) Constructive interference

D) Scattering

D) Scattering

A fundamental difference between light and electron microscopy is:

A) Detector type only

B) Radiation used: photons vs. electrons

C) Shorter objective barrels

D) Use of deionize water

B) Radiation used: photons vs. electrons

Who invented the first microscope?

A) Zacharias Janssen

B) Anton van Leeuwenhoek

C) Isaac Newton

D) Albert Einstein

A) Zacharias Janssen

A frequent artifact in SEM with nonconductive specimens is:

A) Phase halos

B) Surface charging

C) Photobleaching

D) Dye leaching

B) Surface charging

Heavy metals (osmium, uranyl) in TEM are used to:

A) Increase fluorescence

B) Improve contrast via electron scattering

C) Reduce electron wavelength

D) Avoid cryoprotection

B) Improve contrast via electron scattering

Who in 1674, whit his microscope, discovered a world of millions of tiny "animalcules"?

A) Anton van Leeuwenhoek

B) Friedrich Henle

C) Gerhard Dogmagk

D) Paul Ehrlich

A) Anton van Leeuwenhoek

Who in 18th century organized bacteria into genera an species according Linnaeus classification methods?

A) Alexander Fleming

B) Louis Pasteur

C) Otto Müller

D) Selman Waksman

C) Otto Müller

Who in 1840 propused the "germ theory" of disease?

A) Anton van Leeuwenhoek

B) Friedrich Henle

C) Gerhard Dogmagk

D) Paul Ehrlich

B) Friedrich Henle

Who in 1870s and 1880s confirm rabies, plague, cholera... were responsible for microorganisms?

A) Alexander Fleming

B) Louis Pasteur

C) Otto Müller

D) Selman Waksman

B) Louis Pasteur

Who in 1910 discovered the first anibacterial agent?

A) Anton van Leeuwenhoek

B) Friedrich Henle

C) Gerhard Dogmagk

D) Paul Ehrlich

D) Paul Ehrlich

Who in 1928 discovered penicillin?

A) Alexander Fleming

B) Louis Pasteur

C) Otto Müller

D) Selman Waksman

A) Alexander Fleming

Who in 1935 discovered sulfanilamide?

A) Anton van Leeuwenhoek

B) Friedrich Henle

C) Gerhard Dogmagk

D) Paul Ehrlich

C) Gerhard Dogmagk

Who in 1943 discovered streptomycin?

A) Alexander Fleming

B) Louis Pasteur

C) Otto Müller

D) Selman Waksman

D) Selman Waksman

Who in 1946 was the first to cultivate virises in cell cultures?

A) Friedrich Henle

B) John Enders

C) Gerhard Dogmagk

D) Louis Pasteur

B) John Enders

Who is known as the inventor of the microscope?

A) Anton van Leeuwenhoek

B) Galileo Galilei

C) Louis Pasteur

D) Otto Müller

B) Galileo Galilei

What is the most common school microscope?

A) Brightfield (light) microscope

B) Darkfield microscope

C) Electron microscope

D) Fluorescent microscope

A) Brightfield (light) microscope

What microscope uses a special condenser to avoid passing light directly through the specimen?

A) Darkfield microscope

B) Electron microscope

C) Fluorescent microscope

D) Phase-contrast microscope

A) Darkfield microscope

Which microscopy uses fluorochromes in the slides?

A) Brightfield (light) microscopy

B) Darkfield microscopy

C) Electron microscopy

D) Fluorescent microscopy

D) Fluorescent microscopy

Which microscope use annular rings in the condenser and the objective lens?

A) Darkfield microscope

B) Electron microscope

C) Fluorescent microscope

D) Phase-contrast microscope

D) Phase-contrast microscope

Which microscope emits a shorter wavelength of light than that emitted by traditional?

A) Brightfield (light) microscope

B) Darkfield microscope

C) Electron microscope

D) Fluorescent microscope

D) Fluorescent microscope

With which microscope is it difficult to study internal structures because light passes around the sample?

A) Darkfield microscope

B) Electron microscope

C) Fluorescent microscope

D) Phase-contrast microscope

A) Darkfield microscope

What is the simplest microscope that only relies on the system of objectives and eyepieces?

A) Brightfield (light) microscope

B) Darkfield microscope

C) Electron microscope

D) Fluorescent microscope

A) Brightfield (light) microscope

Which microscope allows you to see the internal details of microbes to examine?

A) Darkfield microscope

B) Electron microscope

C) Fluorescent microscope

D) Phase-contrast microscope

D) Phase-contrast microscope

Which microscope uses magnetic coils rather than lenses?

A) Brightfield (light) microscope

B) Darkfield microscope

C) Electron microscope

D) Fluorescent microscope

C) Electron microscope

Which microscopy let us see viruses?

A) Darkfield microscopy

B) Electron microscopy

C) Fluorescent microscopy

D) Phase-contrast microscopy

B) Electron microscopy

Which one is the simplest of preparation samples for microscopic examination method?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

C) Direct examination

Wet mount is an example of which of the following?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

C) Direct examination

Which one is used to identify specific organisms or components of cellular material?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

B) Differential stains

Gram is an example of which of the following?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

B) Differential stains

Iron hematoxylin stains is an example of which of the following?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

B) Differential stains

Which one use mixtures of acids or alcohols?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

A) Acid-Fast stains

Ziehl-Neelsen is an example of which of the following?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

A) Acid-Fast stains

Which one use fluorescent antibody stain?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

D) Fluorescent stains

Acridine orange stain is an example of which of the following?

A) Acid-Fast stains

B) Differential stains

C) Direct examination

D) Fluorescent stains

D) Fluorescent stains