15816.The enzyme responsible for the reduction of molecular nitrogen to the level of ammonia in the leguminous root nodule is
nitrogenase
nitrate reductase
nitrite reductase
all of the above
15817.Many enzymes are secreted in inactive form to protect
Cell Membrane
Mitochondria
Cell proteins
Cell DNA
15818.Assertion: Arachidic acid is an unsaturated fatty acid.
Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
Reason: There are one or more double bonds between carbon atoms in unsaturated fatty acids.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
15819.Assertion: A coenzymes or metal ions that is very tightly bound to enzyme protein is called prosthetic group.
Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.
Reason: A complete, catalytically active enzyme together with its bound prosthetic group is called apoenzyme.
Both Assertion and Reason are true and Reason is the correct explanation of the Assertion.
Both Assertion and Reason are true but the Reason is not the correct explanations of Assertion.
Assertion is true, but Reason is false.
Both Assertion and Reason are false.
15820.Which one of the following amino-acids was not found to be synthesized in Miller s experiment?
Glutamic acid
Aspartic acid
Glycine
Alanine
15822.The "lock and key" model of enzyme action illustrates that a particular enzyme molecule
May be destroyed and resynthesised several times
Interacts with a specific type of substrate molecule
Reacts at identical rates under all conditions
Forms a permanent enzyme-substrate complex
15823.Which of the following is produced with the combination of apoenzyme and coenzyme?
Holoenzyme
Enzyme substrate complex
Prosthetic group
Enzyme product complex
15824.An example of competitive inhibition of an enzyme is the inhibition of
succinic dehydrogenase by malonic acid
cytochrome oxidase by cyanide
hexokinase by glucose-6-phosphate
carbonic anhydrase by carbon dioxide
15826.Blocking of enzyme action by blocking its active sites is
allosteric inhibition
feedback inhibition
competitive inhibition
non-competitive inhibition
15827.Which one is the most abundant protein in the animal world?
Collagen
Insulin
Trypsin
Haemoglobin
15828.Enzymes, vitamins and hormones are common in
Enhancing oxidative metabolism
Being synthesised in the body of organisms
Being proteinaceous
Regulating metabolism
15830.Enzyme catalyzing rearrangement of atomic groupings without altering molecular weight or number of atoms is
ligase
isomerase
oxidoreductase
hydrolase
15831.The general mechanism is that an enzyme acts by
reducing the energy of activation
increasing the energy of activation
decreasing the pH
increasing the pH