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TLS Online TPP Program

#Question id: 11163

The reason that paralogous genes can diverge from each other within the same gene pool, whereas orthologous genes diverge only after gene pools are isolated from each other, is that

#Unit 9. Diversity of Life Forms
  1. having multiple copies of genes is essential for the occurrence of sympatric speciation in the wild.
  2. paralogous genes can occur only in diploid species; thus, they are absent from most prokaryotes.
  3. polyploidy is a necessary precondition for the occurrence of sympatric speciation in the wild.
  4. having an extra copy of a gene permits modifications to the copy without loss of the original gene product.
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TLS Online TPP Program

#Question id: 23188

#Unit 13. Methods in Biology

What is the major advantage of structured illumination microscopy (SIM)?
TLS Online TPP Program

#Question id: 3495

#Unit 11. Evolution and Behavior

Which one of the following statements is incorrect?
TLS Online TPP Program

#Question id: 2992

#Unit 2. Cellular Organization

DNA was isolated from three different cell types of the same organism, the relative DNA content for each type was determined, and the results were plotted on the graph shown in the figure below. Refer to the graph to answer the following questions. Which sample of DNA might be from a cell that stopped the process of cell division in G0 phase of the cell cycle prior to meiosis?
TLS Online TPP Program

#Question id: 23787

#Unit 7. System Physiology – Animal

What happens when melanopsin is activated?
TLS Online TPP Program

#Question id: 3285

#Unit 11. Evolution and Behavior

Natural selection continually operates on each species to keep up with improvements made by competing species; each species’ environment deteriorates as its competitors evolve new adaptations. This is known as