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TLS Online TPP Program

#Question id: 12252

In a study of interactions between plants, ants and caterpillars, the following experimental treatments were imposed: i) Control (both ants and caterpillars are present); ii) Ant removal; iii) Caterpillar removal; iv) Ant and caterpillar removal. Plus (+) indicates presence and minus (-) indicates absence on plants. The results for plant performance (growth) from this experiment  are shown in the figure below. Plant performance in all treatments were significantly different from each other. Based on these results, which of the following inferences is correct?


#Unit 10. Ecological Principles
  1. In the absence of caterpillars, ants negatively affected plant performance
  2. In the absence of ants, caterpillars positively affected plant performance 
  3. In the presence of caterpillars, ants negatively affected plant performance 

  4. In the presence of ants, caterpillars positively affected plant performance


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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?
TLS Online TPP Program

#Question id: 33351

#Unit 1. Molecules and their Interaction Relevant to Biology

When exposed to oxygen, isolated heme