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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: 27314

#Section 3: Genetics, Cellular and Molecular Biology

A feature of RNA that adds to its propensity to form double-helical structures is additional non-Watson–Crick base pairs. One such example is the G:U base pair, which has
TLS Online TPP Program

#Question id: 27315

#Section 5: Bioprocess Engineering and Process Biotechnology

In an exponentially growing batch culture of Saccharomyces cerevisiae, the cell density is 30 𝑔𝐿−1(𝐷𝐶W), the specific growth rate (𝜇) is 0. 4ℎ−1 and substate uptake rate (rs) is 18𝑔𝐿−1ℎ−1. The cell yield coefficient 𝑌𝗑/𝑠 will be
TLS Online TPP Program

#Question id: 27316

#Section 5: Bioprocess Engineering and Process Biotechnology

If the rate of product formation is approximately proportional to the rate of cell growth, then this pattern of product formation is referred to as:
TLS Online TPP Program

#Question id: 27317

#Section 5: Bioprocess Engineering and Process Biotechnology

In microbial cultivation, the expression for product synthesis rp = αµX + βX denotes
TLS Online TPP Program

#Question id: 27318

#Section 5: Bioprocess Engineering and Process Biotechnology

The specific productivity (qp) of an enzyme production is fitted linearly with specific growth rate (μ) of a fungal organism according to the equation qp = α.μ + β. The estimated values of constants α and β are 0.0006 and 25 respectively. The enzyme production kinetics is
TLS Online TPP Program

#Question id: 27319

#Section 5: Bioprocess Engineering and Process Biotechnology

Which one of the following statements is FALSE. Microbial secondary metabolites are