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TLS Online TPP Program

#Question id: 3846

A heat-sensitive DNA ligase (25°C permissive, 37°C nonpermissive) has been used to show that DNA synthesis is discontinuous. Examination of DNA replication in the presence of [3H]-thymidine in the mutant would demonstrate which of following?

#Unit 3. Fundamental Processes

  1. The accumulation of short segments of unlabeled DNA at 25°C and at 37°C

  2. The accumulation of short segments of unlabeled DNA at 25°C but not at 37°C

  3. The accumulation of short segments of radioactive DNA at 25°C but not at 37°C

  4. The accumulation of short segments of radioactive DNA at 37°C but not at 25°C

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TLS Online TPP Program

#Question id: 33342

#Unit 2. Cellular Organization

The junction between new and old peptidoglycan forms a ridge on the cell surface of gram-positive bacteria called:
TLS Online TPP Program

#Question id: 33343

#Unit 2. Cellular Organization

Which of the following lipid carrier molecule is involved in the transport of peptidoglycan precursors across the cytoplasmic membrane to the growing point of the cell wall? 
TLS Online TPP Program

#Question id: 33344

#Unit 2. Cellular Organization

Which of the following enzyme insert cell wall precursors into the growing point of the cell wall and interacts with bactoprenol? 
TLS Online TPP Program

#Question id: 33345

#Unit 2. Cellular Organization

A culture was started by inoculating the medium with 100 cells having a generation time of 2 hours. Assuming the culture grows in ideal synchrony, what will be the number of cells in the culture at 8 hours?
TLS Online TPP Program

#Question id: 33346

#Unit 2. Cellular Organization

Growth of an organism was monitored at regular intervals of times and shown in the graph below. Around what time is the rate of growth zero?
TLS Online TPP Program

#Question id: 33347

#Unit 2. Cellular Organization

A rapidly growing bacterial species such as E. coli exhibits a typical phase of growth cycle in liquid nutrient broth (lag phase → log phase → stationary phase → death phase). If a bacterial culture has starting density of 103 cells/ml has a lag time of 10 minutes and a generation time of 10 minutes, what will the cell density be at (cells/ml) 50 minutes?