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TLS Online TPP Program

#Question id: 12182

The cell cycle is controlled by protein kinases that comprise a catalytic subunit and a regulatory subunit. Which of the following statement is correct regarding to these subunits?

#Unit 2. Cellular Organization
  1. The catalytic subunits, the cyclin-dependent kinases (CDKs), have no kinase activity unless they are dissociated with a regulatory cyclin subunit. 
  2. Each CDK can associate with a small number of different cyclins, which determine the substrate specificity of the complex—that is, which proteins it phosphorylates.
  3. Cyclin-CDK complexes activate or inhibit hundreds of proteins involved in cell cycle progression by phosphorylating or dephosphorylating them at specific regulatory sites. 
  4. Proper progression through the cell cycle is governed by activation of the appropriate homodimeric protein kinase complex at the appropriate time.
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TLS Online TPP Program

#Question id: 12989

#Unit 1. Molecules and their Interaction Relevant to Biology

Choose the correct statement related to hydrogen bond and Van der Waals interactions
a. Hydrogen bond formation takes place between dipole-dipole interaction.
b. Van der waals interaction takes place between induced dipole-induced dipole.
c. Hydrogen bond formation takes place between induced dipole-induced dipole.
d. Van der waals interaction takes place between dipole-dipole interaction.
TLS Online TPP Program

#Question id: 341

#Unit 1. Molecules and their Interaction Relevant to Biology

 Which force can stabilize a DNA double-helix?
TLS Online TPP Program

#Question id: 339

#Unit 1. Molecules and their Interaction Relevant to Biology

The edges of each base pair are exposed in the major and minor grooves, creating a pattern of hydrogen-bond donors and acceptors and of hydrophobic groups (allowing for Vander Waals interactions) that identifies the base pair. The edge of an C : G base pair displays the following chemical groups in the following order in the major groove:
TLS Online TPP Program

#Question id: 338

#Unit 1. Molecules and their Interaction Relevant to Biology

What is the difference between covalent bonds and ionic bonds?
TLS Online TPP Program

#Question id: 337

#Unit 1. Molecules and their Interaction Relevant to Biology

Which statement below is true about the relative lifetime of a hydrogen bond, compared to the rate of water’s ionization to hydroxide ions and hydronium ions?
TLS Online TPP Program

#Question id: 336

#Unit 1. Molecules and their Interaction Relevant to Biology

Which would you expect to be most soluble in water?