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 Multiple Choice QuestionsMultiple Choice Questions

1.

Assertion : The number of cells in a multicellular organism is inversely proportional to the size of body.

Reason : All the cells in the biological world are of same size.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


D.

If both the assertion and reason are false.

The number of cells in a multicellular organism are directly proportional to the size of the body. On the other hand, it is a fact that cells vary greatly in their size.


2.

Which of the following is related to glycosylation of protein?

  • Lysosome

  • Mitochondrium

  • Peroxisome

  • Rough endoplasmic reticulum


D.

Rough endoplasmic reticulum

Glycosylation is the reaction in which a carbohydrate, i.e. a glycosyl donor, is attached to a hydroxyl or other functional group of another molecule (a glycosyl acceptor). Glyeoproteins are formed in the lumen of rough endoplasmic reticulum, but may subsequently be modified in the lumen of the Golgi apparatus, where other amino acids of the protein may become glycosylated.


3.

Barr body is found in the cytoplasm during

  • interphase in cell of female mammal

  • interphase in cell of male mammal

  • prophase in cell of female mammal

  • prophase in cell of male mammal


A.

interphase in cell of female mammal

Barr body is also known as sex chromatin. It is partially inactivated. Its development occurs in one of the two X chromosomes in interphase nuclei. Any of the two X-chromosomes can become heterochromatic.


4.

Assertion : A cell membrane shows fluid behaviour.

Reason : A membrane is a mosaic or compositeof diverse lipids and proteins.

  • If both Assertion and Reason are true and the reason is the correct explanation of the assertion

  • If both Assertion and Reason are true but the reason is not the correct explanation of the assertion

  • If Assertion is true statement but Reason is false

  • If both Assertion and Reason are false statements


A.

If both Assertion and Reason are true and the reason is the correct explanation of the assertion

The structure of cell membrane can be described by the fluid-mosaic model. It was given by Singer and Nicolson in 1972. The essential feature of fluid-mosaic model is cell membranes are considered to be quasifluid structures in which the lipids and proteins are in mosaic manner. It is considered to be as the lipid-protein association (mosaic) and also to be hydrophobic. The fluidity of the membrane is the result of this hydrophobic interaction, thus a cell membrane shows fluid behaviour.


5.

"All tissues consist of cells" sentence was said by

  • Wallace

  • Virchow

  • Schleiden

  • None of these


C.

Schleiden

Schleiden (1838) proposed cell theory and said, "all tissues consist of cell".


6.

Assertion : Plasma membrane is exceedingly thin and not visible as a separate layer. 

Reason : It appears merely as a surface layer of cytoplasm.

  • If both Assertion and Reason are true and Reason is the correct explantion of Assertion

  • If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

  • If Assertion is true but Reason is false

  • If Assertion is false but Reason is true


B.

If both Assertion and Reason are true and Reason is not the correct explanation of Assertion

All cells are bounded by a thin membrane called the plasmalemma. This membrane is not seen under light microscope as separate layer. It has no cell cement and thus it is very thin. It has structural proteins, enzymes and carrier proteins.


7.

Assertion: Specialization ofcells is advantageous for the organism.

Reason : It increases the operational efficiency of an organism.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both the assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both the assertion and reason are false.


A.

If both assertion and reason are true and reason is the correct explanation of assertion.

Specialization of cells into tissue, organ and organ systems is advantageous for the organism. It increases the operational efficiency through division of labour which avoids duplication of work.


8.

Which of these are most widely used in genetic engineering?

  • Plastid

  • Plasmid

  • Mitochondrion

  • Ribosome


B.

Plasmid

Plasmids are autonomous elements, whose genomes exist in the cell as the extra chromosomal unit. These are found in bacteria. They are used as cloning vectors due to their increased yield potential.

Plastids are semi autonomous cell organelles. They take part in storage and synthesis of organic compounds.

Mitochondria are called the power houses of the cell as they are the centres of Kreb's cycle of respiration liberating the maximum amount of energy.

Ribosomes are sub- microscopic cell organelles manufacturing protein.


9.

Maximum absorption of light occurs in the region of

  • 400 - 700 nm

  • 700 - 900 nm

  • 1000 - 1200 nm

  • 1500 - 2000 nm


A.

400 - 700 nm

Wavelengths shorter than 380 nm have too much energy which can disrupt the molecular organisation of cell; wavelength longer than 750 nm do not have energy to raise an electron to a higher orbital.


10.

A chromosome carrying the centromere at one of the ends is called

  • acentric

  • submetacentric

  • telocentric

  • metacentric


C.

telocentric

A telocentric chromosome'scentromere is located at the terminal end of thechromosome. A telocentric chromosome has therefore only one arm.