Tag: cell theory

Questions Related to cell theory

What kind of microscopy uses acridine orange?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Phase contrast

  2. Fluorescence

  3. Transmission microscope

  4. Scanning electron microscope

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Correct Option: B

In light microscope which lens does not take part in image formation?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Objective$(5X)$

  2. Objective$(45X)$

  3. Condenser(D)

  4. Ocular

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Correct Option: C

Robert Hooke used the ................... to look at the cells for the first time.

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Light microscope

  2. Dark field microscope

  3. Transmission electron microscope

  4. Scanning electron microscope

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Correct Option: A

The conjugation of antibodies with which of the following is useful in fluorescence microscopy?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Metal ions

  2. Dyes

  3. Carbohydrates

  4. Lipids

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Correct Option: B

Dry weight of macromolecules like RNA, proteins and DNA can be known through which method?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Fluorescent microscopy

  2. Dark field microscopy

  3. Phase contrast microscopy

  4. Differential interference contrast microscopy.

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Correct Option: D

Which of the following statements is not true?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Fluorescent microscopy uses normal light to view molecules.

  2. Immersion oil increases refractive index.

  3. Electron microscope uses electromagnetic lenses.

  4. Scanning tunneling microscope is used for scanning computer chips for defects.

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Correct Option: A

The first compound light microscope was constructed by which scientist?

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Hooke

  2. Brown

  3. Leeuwenhoek

  4. Zernicke

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Correct Option: A

The resolving power of a compound microscope will enhance with

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Increase in both wavelength of light and numerical aperture.

  2. Decrease in both wavelenth of light and numerical aperture.

  3. Decrease in wavelength of light and increase in numerical aperture.

  4. Increase in wavelength of light and decrease in numerical aperture.

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Correct Option: C
Explanation:
The resolving power of a compound microscope can be defined as the ability of the microscope to form separate images of two objects placed very close to each other.
The resolving power of the compound microscope will increase with a decrease in wavelength of light and an increase in the numerical aperture.
So, the correct answer is 'Decrease in wavelength of light and an increase in the numerical aperture'.

Magnifying glasses were used for studying living beings for the first time by _________________.

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Galileo Galilei.

  2. Gesner.

  3. Faber.

  4. Leeuwenhoek.

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Correct Option: A

Kepler and Galileo developed

botany cell and cellular organization cell theory microscope cell and its discovery

  1. Field glasses.

  2. Telescope.

  3. Oil immersion.

  4. Class room microscope.

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Correct Option: A