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TLS Online TPP Program

#Question id: 19458

How phase contrast and DIC microscopy are used to image live cells and unstained tissues?

#Unit 13. Methods in Biology
  1. Take advantage of differences in the contrast and thickness of cellular materials
  2. Take advantage of differences in the refractive index and thickness of cellular materials
  3. Live cells show bioluminiscence
  4. Take advantage of differences in chromosomes
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TLS Online TPP Program

#Question id: 5239

#Unit 8. Inheritance Biology

Which of the following statements is not true for Hfr strains of E. coli ?
TLS Online TPP Program

#Question id: 18079

#Unit 9. Diversity of Life Forms

Within a gymnosperm megasporangium, what is the correct sequence in which the following should appear during development, assuming that fertilization occurs? 
1. Sporophyte embryo 2. female gametophyte 
3. egg cell                 4. megaspore 
TLS Online TPP Program

#Question id: 2626

#Unit 2. Cellular Organization

lac operator is made up of
TLS Online TPP Program

#Question id: 9225

#Unit 9. Diversity of Life Forms

Use the following figure to answer the question


In looking at the species-area plot in the figure, what can be concluded?
TLS Online TPP Program

#Question id: 9230

#Unit 9. Diversity of Life Forms

Brown-headed cowbirds utilize fragmented forests effectively by ________.