Biology MCQs
Biology MCQs Test Preparation | Latest 2025 Quiz FPSC, NTS, KPPSC, PPSC, SPSC, BPSC, OTS, UTS, PTS, CTS, ATS, ETEA MCQs Test Questions.
Magnifying power of electron microscope as compared to eye is____________?
A: 500 X
B: 250000X
C: 500000X
D: 250X
250000X
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
Saturation
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
Robert Brown
A group of ribosomes attached to mRNA is known as___________?
A: Polymer
B: Polypeptide
C: Polysomes
D: Monomer
Polysomes
The rate of reaction is directly proportional to the concentration of an enzyme which statement is incorrect in this respect_________________?
A: Increase in enzyme molecule increases the available active sites.
B: This relation is for unlimited time period with unlimited enzyme concentration
C: If the concentration is doubled the rate will become two fol
D: None of these.
This relation is for unlimited time period with unlimited enzyme concentration
Which statement is incorrect about Lock and Key Model________________?
A: Specific enzyme can transform only a specific substrate
B: Active site of an enzyme is a non flexible structure
C: Active site does not change before during or even after the reaction
D: It explains the mechanism of every chemical reaction
It explains the mechanism of every chemical reaction
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
All the active sites on enzyme molecule are occupied
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
Determined by structure and the specificity of the enzyme
Factory of Ribosomal systhesis is__________?
A: Cytoplasm
B: Nucleus
C: Nucleolus
D: Endoplasmic reticulum
Nucleolus
Cellular organelles related with H2O2 are___________?
A: Glyoxisomes
B: Lysosomes
C: Peroxisomes
D: Ribosomes
Peroxisomes