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
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
Excessive increase in temperature of medium causes the enzyme molecule to____________?
A. Activate
B. Unaffected
C. Denatured
D. None of these
Resolution power of a compound microscope is___________?
A. 2.0 ?m
B. 2-4 A
C. 24 ?m
D. 24 A
Extreme change in pH results in______________?
A. Change in ionization of amino acids at the active site of the enzyme
B. Change in the ionization of the substrate
C. Denaturation of the enzyme
D. Increase in the reaction rate
Who opposed the idea the cell is an empty space bounded by thick wall?
A. Lorenz Oken
B. Schwann
C. Robert Brown
D. Rudolph Virchow
If more substrate to already occurring enzymatic reaction is added and there is no effect on the rate of the reaction what is the form given to this situation___________?
A. Saturation
B. Denaturation
C. Composition
D. Inhibition
Factory of Ribosomal systhesis is__________?
A. Cytoplasm
B. Nucleus
C. Nucleolus
D. Endoplasmic reticulum
The active site of an enzyme______________?
A. Never changes
B. Forms no chemical bond with substrate
C. Determined by structure and the specificity of the enzyme
D. They are non specific in their action
If the concentration of enzyme is kept constant and amount of substrate is increased a point is reached where increase in substrates concentration does not affect the reaction rate because of____________________?
A. Enzymes get denatured at higher substrate conc
B. Rate of reaction is indirectly proportional to substrate concentration at this point
C. All the active sites on enzyme molecule are occupied
D. None of these