31.
Select the correct statement from the following regarding cell membrane.
A
$$N{a^ + }$$ and $${K^ + }$$ ions move across cell membrane by passive transport
B
Proteins make up 60% to 70% of the cell membrane
C
Lipids are arranged in a bilayer with polar heads towards the inner part
D
Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
Answer :
Fluid mosaic model of cell membrane was proposed by Singer and Nicolson
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32.
The type of linkage present in carbohydrates is
A
Peptide
B
Glycosidic
C
Amide
D
Phosphate bonds
Answer :
Glycosidic
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33.
Which is not true about sphaerosnoes
A
Involved in photorespiration
B
Arise from E. R.
C
Related to fat metbolism
D
Single membane bound
Answer :
Involved in photorespiration
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34.
During replication of a bacterial chromosome DNA synthesis starts from a replication orgin site and
A
RNA primers are involved
B
In facilitated by telomerase
C
Moves in one direction of the site
D
Moves in bi-directional way
Answer :
Moves in bi-directional way
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35.
Only R.N.A. contains which of the following base
A
Thymine
B
Uracil
C
Adenine
D
None of the above
Answer :
Uracil
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36.
Nucleolus is made up of
A
DNAand RNA
B
Lipid +Protin
C
RNA and Protein
D
Phospholipid
Answer :
RNA and Protein
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37.
Plasma membrane exhibits for external substance
A
Impermeabiltiy
B
Semi permeabiltiy
C
Permeabiliy`
D
SelectiveSemipermeability
Answer :
SelectiveSemipermeability
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38.
Which structures perform the function of mitochondria in bacteria?
A
Nucleoid
B
Ribosomes
C
Cell wall
D
Mesosomes
Answer :
Mesosomes
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39.
Centriolws and centrosomes are presente in cells of
A
Animals
B
Bactria
C
Green cells
D
Cyanobacteri
Answer :
Animals
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40.
Centrioles are found in
A
Chromosomes
B
Nucleus
C
Centrosome
D
Centromere
Answer :
Centrosome
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