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TLS Online TPP Program

#Question id: 12835

Following statements are regarding to the surveillance mechanism. Which of the following statement is incorrect?

#Unit 2. Cellular Organization
  1. DNA damage leads to the activation of p21, a transcription factor that induces the expression of the gene encoding the CDK inhibitor p53.
  2. When the DNA damage occurs during S phase or in G2, Cdc25C inhibition by Chk1/2 results in the inhibition of mitotic CDKs and hence arrest in G2.
  3. Cells sense DNA replication stress that results in stalling or slowing of replication forks. Such stress triggers activation of the ATR-Chk1 checkpoint pathway and results in downregulation of S phase CDK activity and prevents the firing of late-replicating origins.
  4. ATM halts cell cycle progression by Chk2-mediated inhibition of Cdc25, thus preventing activation of CDKs. This inhibition can occur in G1 or G2.
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TLS Online TPP Program

#Question id: 1091

#Unit 4. Cell Communication and Cell Signaling

Why does testosterone, a lipid-soluble signaling molecule that crosses the membranes of all cells, affect only target cells?
TLS Online TPP Program

#Question id: 10473

#Unit 1. Molecules and their Interaction Relevant to Biology

Cleavage of beta-carotene by BCMO1 yields two molecules of :
TLS Online TPP Program

#Question id: 10369

#Unit 6. System Physiology – Plant

Which type of the nitrogen-fixing bacteria are thought to maintain a low oxygen concentration (microaerobic conditions) through their high levels of respiration
TLS Online TPP Program

#Question id: 10242

#Unit 10. Ecological Principles

Ecologist Robert Macarthur observed that five species of similar warblers coexisted on spruce trees because they
TLS Online TPP Program

#Question id: 3428

#Unit 11. Evolution and Behavior

In a sample from an African population, the frequency of blood group allele IA, IB and IO were 0.30, 0.20 and 0.50 respectively. What is expected frequency of A and B blood group respectively when population size 1000?