Biology MCQs

1496 MCQs — Everyday Science MCQs (Page 29 of 150)

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Resolution power of a compound microscope is___________?

A. 2.0 ?m
B. 2-4 a
C. 24 ?m
D. 24 a

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Excessive increase in temperature of medium causes the enzyme molecule to____________?

A. Activate
B. Unaffected
C. Denatured
D. None of these

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If enzyme concentration is low than substrate pH and temperature values are equal to requirement then which of the following will increase rate of reaction____________________?

A. Increase in concentration of enzyme
B. Increase in concentration of substrate
C. Increase in ph
D. Increase in temperature

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In cell fractionation various components of cells including its organelles can be isolated in different layers depending upon____________?

A. Their physical properties like size & weight.
B. Physical properties of the medium like its density.
C. Their electrical properties like their charges
D. Both a and b

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The structure of an enzyme is altered by____________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

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Malonic acid is an example of____________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

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Magnifying power of electron microscope as compared to eye is____________?

A. 500 x
B. 250000x
C. 500000x
D. 250x

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Inhibitors which block the enzyme by forming weak bond are called___________?

A. Competitive inhibitors.
B. Non-competitive inhibitors
C. Irreversible inhibitors.
D. Both a and b

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Which of the statement about cell membrane is not true?

A. It contains protein molecules embedded in lipid bilayer
B. It is a differentially permeable membrane.
C. It contains charged pores thus ions being charged particles cross cell membrance much easier than neutral particles.
D. It may get infolded to engulf solid or liquid material.

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A substance which binds at the active site of the enzyme but does not result in the formation of the products is called________________?

A. Irreversible inhibitor
B. Reversible inhibitor
C. Competitive inhibitor
D. Non-competitive inhibitor

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