Question 1

Differentiation capacity of compound microscope is:

Accepted Answer

Differentiation capacity of compound microscope depends upon numerical aperture of the objective lens system and its wavelength (3900−7600A˚). Depending upon the type of visible light used, the resolving power of a light microscope ranges from 0.2μm to 0.4μm.v

Question 2

A mixture containing DNA fragments a,b,c and d with molecular weights of a+b=c,a>b and d>c, was subjected to agarose gel electrophoresis. The positions of these fragments from cathode to anode sides of the gel would be:

Accepted Answer

Correct answer is A

Question 3

A student wishes to study the cell structure under a light microscope having 10X eyepiece and 45X objective. He should illuminate the object by which one of the following colours of light so as to get the best possible resolution?

Accepted Answer

Correct answer is A

Question 4

Electron microscope is used for:

Accepted Answer

Electron microscope is predominantly used for viewing of ultrastructure of cell and its organelles. Because it has great magnification and resolving power.

Question 5

A magnification of upto 100 million times is possible in:

Accepted Answer

Correct answer is C

Question 6

Resolving power of light microscope is:

Accepted Answer

Correct answer is A

Question 7

Which among the following can be seen only under electron microscope?

Accepted Answer

Electron microscope can magnify the objects upto 2,00,000 times (now possible upto 2,50,000 - 4,00,000 ) and direct of objects is possible on this microscope. Presence of ribosomes (size 23 nm in diameter) is revealed with the help of electron microscope.

Question 8

Who invented the "electron microscope"?

Accepted Answer

Correct answer is A

Question 9

Who proposed the "Cell theory"?

Accepted Answer

M.J. Schleiden and T. Schwann (1838 - 39) proposed cell theory.

Question 10

Which of the following is the exception of cell theory?

Accepted Answer

Viruses are not applicable to cell theory. They are made up of proteins and one of nucleic acids i.e., DNA or RNA. So they lack protoplasm, the essential part of the cell.

Question 11

Difference between the prokaryotic and eukaryotic cells in having:

Accepted Answer

The prokaryotic cells do not have nuclear membrane while eukaryotic cell have well organised nuclear membrane.

Question 12

Intracellular compartments are not found in cells of:

Accepted Answer

Because cell organelles are absent in prokaryotes.

Question 13

How many types of cells are known?

Accepted Answer

In present time three types of cells are known i.e., prokaryotic, mesokaryotic and eukaryotic.

Question 14

The division of the plant kingdom into Prokaryota and Eukaryota is based on the characters of:

Accepted Answer

Correct answer is D

Question 15

T. Schwann and M. Schleiden were:

Accepted Answer

Correct answer is D

Question 16

Who proposed the theory that "cells arise only from the preexisting cells"?

Accepted Answer

Virchow gave 'Omnis cellula a cellula' theory.

Question 17

Which one of the following structures between two adjacent cells is an effective transport pathway?

Accepted Answer

Through plasmodesmata, plasmoderm or a fine thread of protoplasm is passing.

Question 18

Middle lamella is made up of:

Accepted Answer

Correct answer is C

Question 19

The internal layer joining the primary walls of the two adjacent cells is known as:

Accepted Answer

Correct answer is B

Question 20

The strength and rigidity of a cell wall is due to the substance known as:

Accepted Answer

Correct answer is C

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Solutions for Cell: The Unit of Life Important Questions

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