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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?

#Section 3: Genetics, Cellular and Molecular Biology
  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: 4141

#Section 3: Genetics, Cellular and Molecular Biology

Bacterial ribosomes:
TLS Online TPP Program

#Question id: 4142

#Section 3: Genetics, Cellular and Molecular Biology

The large structure consisting of a mRNA molecule being translated by multiple copies of the macromolecular complexes that carry out protein synthesis is called a:
TLS Online TPP Program

#Question id: 4143

#Section 3: Genetics, Cellular and Molecular Biology

It is possible to convert the Cys that is a part of Cys-tRNACys to Ala by a catalytic reduction.  If the resulting Ala-tRNACys were added to a mixture of (1) ribosomes, (2) all the other tRNAs and amino acids, (3) all of the cofactors and enzymes needed to make protein in vitro, and (4) mRNA for hemoglobin, where in the newly synthesized hemoglobin would the Ala from Ala-tRNACys be incorporated?
TLS Online TPP Program

#Question id: 4144

#Section 3: Genetics, Cellular and Molecular Biology

The Wobble Hypothesis suggests that:
TLS Online TPP Program

#Question id: 4145

#Section 3: Genetics, Cellular and Molecular Biology

Steriod hormone response elements (HREs) are _ , which, when bound to _, alter gene expression at the level of _.
TLS Online TPP Program

#Question id: 4146

#Section 3: Genetics, Cellular and Molecular Biology

Approximately how many NTPs must be converted to NDPs to incorporate one amino acid into a protein?