Biology Mcqs

60S and 40S subunit combine to form ________ particle.

A. 100 S
B. 90 S
C. 80 S
D. 70 S

Whone is not the function of endoplasmic reticulum?

A. Nerve impulse conduction
B. Transport of material
C. Mechanical support
D. Synthesis of conjugated molecules

Strengthening material of prokaryotic cell wall is__________?

A. Cellulose
B. Chitin
C. Inorganic salts silica waxes and ligin
D. Peptidoglycan or Murein.

Optimal temperature of enzymes present in human body is_____________?

A. 27?C
B. 37?C
C. 47?C
D. 30?C

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

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.

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

Magnifying power of electron microscope as compared to eye is____________?

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

Malonic acid is an example of____________?

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

The structure of an enzyme is altered by____________?

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