Practice Questions

TLS Online TPP Program

#Question id: 5844

In homologous genetic recombination, RecA protein is involved in:

#XL - T Zoology

formation of Holliday intermediates and branch migration.
introduction of negative supercoils into the recombination products.
nicking the two duplex DNA molecules to initiate the reaction.
pairing a DNA strand from one duplex DNA molecule with sequences in another duplex, regardless of complementarity.

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TLS Online TPP Program

#Question id: 563

#XL - Q Biochemistry

Both water and glucose share an —OH that can serve as a substrate for a reaction with the terminal phosphate of ATP catalyzed by hexokinase. Glucose, however, is about a million times more reactive as a substrate than water. The best explanation is that:

TLS Online TPP Program

#Question id: 564

#XL - Q Biochemistry

A good transition-state analog:

TLS Online TPP Program

#Question id: 565

#XL - Q Biochemistry

A transition-state analog:

TLS Online TPP Program

#Question id: 566

#XL - Q Biochemistry

The role of the metal ion (Mg2+) in catalysis by enolase is to