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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: 2993

#Unit 2. Cellular Organization

During meiosis, a defect occurs in a cell that results in the failure of spindle microtubules binding at the kinetochores. Which of the following statements describes the most likely result of such a defect?
TLS Online TPP Program

#Question id: 19011

#Unit 13. Methods in Biology

Which one of the following methods is the most suitable for amino-acid analysis?
TLS Online TPP Program

#Question id: 4498

#Unit 3. Fundamental Processes

Which enzyme is used in this particular mechanism;
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#Question id: 15421

#Unit 5. Developmental Biology

A signal from the inducing cell is necessary for initiating new gene expression in the responding cell. Without the inducing cell, the responding cell is not capable of differentiating in that particular way, phenomena known as:
TLS Online TPP Program

#Question id: 2836

#Unit 2. Cellular Organization

The fact that a specific protein leaves a “footprint” on a DNA molecule is indicative of
a. a lack of interaction between the specific protein and DNA.
b. protection from DNAse by the specific protein.
c. binding of the specific protein to all types of DNA.
d. binding of the specific protein to a specific sequence of DNA.