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TLS Online TPP Program

#Question id: 563

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:

#SCPH01 Biochemistry

  1. glucose has more —OH groups per molecule than does water.

  2. the larger glucose binds better to the enzyme; it induces a conformational change in hexokinase that brings active-site amino acids into position for catalysis.

  3. the —OH group of water is attached to an inhibitory H atom, while the glucose —OH group is attached to C.

  4. water and the second substrate, ATP, compete for the active site resulting in a competitive inhibition of the enzyme.

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TLS Online TPP Program

#Question id: 4576

#SCPH05 I Biotechnology

Which of the following pairs of structures is least likely to represent homology?
TLS Online TPP Program

#Question id: 23251

#SCPH01 Biochemistry

Which enzyme degrades the resulting component dNTPs and ATP if not incorporated in chain.
TLS Online TPP Program

#Question id: 1294

#SCPH06 I Botany

Dystroglycan is a large glycoprotein that binds to dystrophin in muscle cells.  It is also present in other cells and can also bind to:

a.  laminin.

b.  the virus that causes Lassa fever.

c.  the bacterium that causes leprosy.
TLS Online TPP Program

#Question id: 15220

#SCPH01 Biochemistry

Which of the following highly sensitive analytical technique particularly useful for studying microheterogeneity in a protein
TLS Online TPP Program

#Question id: 5061

#SCPH01 Biochemistry

 The activin family, the bone morphogenetic proteins (BMPs), the Nodal proteins, the Vg1 family included in-