15835.Fluidity of bio-membranes can be shown by
Electron microscope
Tissue culture
Phase-contrast microscope
Fluorescence microscope
15837.Catalysts are different from enzymes in
functional at high temperature
not used up in reaction
being proteinaceous
having high rate diffusion
15841.ELISA tests are used to
Isolate DNA sequence
Purity proteins
Separate viral RNA
Identify specific proteins
15842.Which one of the following is resistant to enzyme action?
Leaf cuticle
Cork
Wood fibre
Pollen exine
15845.Enzymes having slightly different molecules structure but performing identical activity are
Apoenzymes
Isoenzymes
Holoenzymes
Coenzymes
15846.Which of the following influence feedback inhibition of enzyme?
End product
External factors
Enzyme
Substrate
15847.Which of the following statements regarding enzyme inhibition is correct?
Competitive inhibition is seen when a substrate competes with an enzyme for binding to an inhibitor protein
Non-competitive inhibitors often bind to the enzyme irreversibly
Competitive inhibition is seen when the substrate and the inhibitor compete for the active site on the enzyme
Non-competitive inhibition of an enzyme can be overcome by adding large amount of substrate
15850.One common example of feedback inhibition would be ______.
Allosteric inhibition of hexokinase by glucose-6-phosphate
Reaction between succinic dehydrogenase and succinic acid
Cyanide and cytochrome reaction
Sulfa drugs and folic acid synthesis in bacteria
15852.Beadle and Tatum showed that each kind of mutant bread mould they studied lacked a specific enzyme. Their experiments demonstrated that
Cells need specific enzymes in order to function
Genes are made of DNA
Genes carry information for making proteins
Enzymes are required to repair damaged DNA information
15854.Restriction endonucleases are enzymes which
Remove nucleotides from the ends of the DNA molecule
Make cuts at specific positions within the DNA molecule
Recognize a specific nucleotide sequence for binding of DNA ligase
Restrict the action of the enzyme DNA polymerase