Tag: cell and its discovery

Questions Related to cell and its discovery

Light is split into two beams in

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

  1. Fluorescent microscope.

  2. Differential interference contrast microscope.

  3. Phase contrast microscope.

  4. Dark field microscope.

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Correct Option: B

What is the magnification of scanning probe microscope?

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

  1. 100-200x

  2. 200-500x

  3. 800–1000x

  4. 1500-2000x

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Correct Option: C

The microscope used for detecting defects in electrical conductors and computer chips is____________________________.

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

  1. Atomic force microscope.

  2. Scanning tunneling microscope.

  3. X-ray crystallography.

  4. Scanning electron microscope.

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Correct Option: B

A student wants to study the metaphasic behaviour of chromosomes in a living cell. The technique most suitable is

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

  1. Phase-contrast microscope.

  2. X-ray microscope.

  3. Cell fractionation.

  4. Scanning electron microscope.

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Correct Option: A
Explanation:

Phase contrast microscopy is a type of microscopic technique which converts phase shifts in light passing through a transparent specimen to brightness changes in the image. This technique made possible to study living cells without staining.

Hence A is the correct option. 

High wavelength UV rays are used in

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

  1. Fluorescent microscope.

  2. Polarising microscope.

  3. Ultraviolet microscope.

  4. Phase-contrast microscope.

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Correct Option: A
Explanation:

Fluorescent microscope is a modification of ultraviolet microscope, which was made by Coons. The instrument uses long wave ultra violet rays for illumination. The microscope is useful in detecting those components which show autofluorescence, e.g., chlorophyll, collagen fibrils, vitamin A.

The types of lenses in a compound microscope are

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

  1. $3$.

  2. $4$.

  3. $2$.

  4. $1$.

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Correct Option: A
Explanation:
There are three main types of optical telescopes; refractive, reflective, and catadioptric. Refractive telescopes, such as the one invented by Galileo, use an objective lens and an eyepiece.
So the correct option is A. 

A living cell is to be studied without staining. A microcsope that can be used for this is

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

  1. Phase contrast microscope

  2. TEM

  3. SEM

  4. Fluorescent microscope

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Correct Option: A
Explanation:
Option $ -(A) $ Phase contrast microscope
It is an optical microscopy technique that converts phase shifts in light passing through a transparent specimen to brightness changes in the images.

Distribution of two or more specific molecules within a cell is studied by _______________.

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

  1. Fluorescent microscope.

  2. Dark field microscope.

  3. Bright field microscope.

  4. Phase contrast microscope.

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Correct Option: A
Explanation:
The fluorescence microscope can localize and quantify specific molecules in the cells. It is the most versatile and powerful technique for localizing proteins within a cell by light microscopy, is fluorescent staining of cells and the observation in the fluorescence microscope.
Thus, the correct answer is option A. 

A chemical substance irradiated with ultraviolet rays emits visible light. What is it called?

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

  1. Luminescent

  2. Bioluminescent

  3. Fluorochrome

  4. Metachrome

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Correct Option: C

A major breakthrough in the studies of cells came with the development of electron microscope. This is because

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

  1. Electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons.

  2. Resolution power of electron microscope is much higher than that of light microscope.

  3. Resolution power of electron microscope is $200-350$nm as compared to $0.1-02$nm for the light microscope.

  4. Electron beam can pass through thick materials whereas light microscopy requires thin sections.

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Correct Option: B