Tag: cell theory

Quizzes (0) Questions (129)

Questions Related to cell theory

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

Light is split into two beams in

  1. Fluorescent microscope.

  2. Differential interference contrast microscope.

  3. Phase contrast microscope.

  4. Dark field microscope.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Differential interference contrast (DIC) microscopy uses a prism to split light into two beams that pass through the specimen and are then recombined to create contrast based on optical path differences.

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

What is the magnification of scanning probe microscope?

  1. 100-200x

  2. 200-500x

  3. 800–1000x

  4. 1500-2000x
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Scanning probe microscopes, such as the AFM or STM, are known for extremely high magnification capabilities, often reaching into the range of 1000x or significantly higher depending on the specific application and setup.

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

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

  1. Atomic force microscope.

  2. Scanning tunneling microscope.

  3. X-ray crystallography.

  4. Scanning electron microscope.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Scanning tunneling microscopy (STM) is highly sensitive to surface topography and electronic properties, making it the standard tool for inspecting conductive surfaces like computer chips for atomic-scale defects.

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

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

  1. Phase-contrast microscope.

  2. X-ray microscope.

  3. Cell fractionation.

  4. Scanning electron microscope.
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 

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

High wavelength UV rays are used in

  1. Fluorescent microscope.

  2. Polarising microscope.

  3. Ultraviolet microscope.

  4. Phase-contrast microscope.
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

The types of lenses in a compound microscope are

  1. $3$.
  2. $4$.
  3. $2$.
  4. $1$.
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

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

  1. Phase contrast microscope

  2. TEM

  3. SEM

  4. Fluorescent microscope
Reveal answer Fill a bubble to check yourself
A Correct answer
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.
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

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

  1. Fluorescent microscope.

  2. Dark field microscope.

  3. Bright field microscope.

  4. Phase contrast microscope.
Reveal answer Fill a bubble to check yourself
A Correct answer
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. 
Multiple choice botany cell and cellular organization cell theory microscope cell and its discovery

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

  1. Luminescent

  2. Bioluminescent

  3. Fluorochrome

  4. Metachrome
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A fluorochrome is a chemical compound that can re-emit light upon light excitation, a process known as fluorescence. This is the fundamental principle used in fluorescence microscopy.

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

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

  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.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The electron microscope provides much higher resolution than a light microscope because electrons have a much shorter wavelength than visible light photons, allowing for the visualization of much smaller structures.