Zoology MCQs for NEET — Practice Questions with Answers

urease                               

dehydrogenase

rubisco protein                   

nitrate reductase

Consists of 4 subunits - hence the name quaternary

Is unrelated to the function of the protein

Both (a) and (b)

Depends on the 1° structure of subunits

Fatty acids may be unsaturated (with one or more C = C bonds) or a saturated (without double bonds)

Fatty acid(s) may be esterified with glycerol forming monoglyceride, diglyceride and then triglyceride

Sometimes especially neural tissues have lipid very simple structures

Fats and oils are triglycerides

Nucleotides, nucleosides              

Nucleosides, nucleotides

Nucleotides, nucleic acids            

Nucleotides, nucleases

Rubber            

Morphine                  

Gum               

Cellulose

Chitin

Polyethylene

Peptidoglycan

Inulin

Inorganic catalysts work efficiently at high temperature and high pressure while enzymes get damaged at high temperature (above 40°C)

Thermophilic organisms living in hot vents and sulphur springs have enzymes that are stable and retain their catalytic power even at high temperature (80 - 90°C)

Ribozymes are nucleic acids behaving like enzyme

All are correct

Is the difference in the average energy content of 'S' from that of its transition state

Helps to change reactants into unstable transition state before they can be converted into products

Is minimum energy required from outside to overcome the energy barrier of reactant or to start a reaction

All are correct

Km (Michaelis - Menten) constant is the substrate concentration at which the enzymatic reaction attains half of its maximum velocity (1/2 Vmax)

At lower Km, higher the substrate affinity for enzyme

Vmax is reached when all the active sites of an enzyme are saturated with substrate

All are correct

Inhibitor resembles the substrate in molecular structure

Competition between substrates and inhibitors to occupy active sites

Binding the inhibitors to activities sites declines the enzyme action

All are correct