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TLS Online TPP Program

#Question id: 26493

Splicing is an……….. reaction reaction that proceeds through a …………….intermediate (fill in the blanks)

#Unit 3. Fundamental Processes
  1. Elimination, tetravalent phosphorous 
  2. SN1, pentavalent phosphorous 
  3. SN2 , pentavalent phosphorous 
  4.  Dehydration, tetravalent phosphorous

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TLS Online TPP Program

#Question id: 18814

#Unit 13. Methods in Biology

Which one of the following is not a PCR based molecular marker?
TLS Online TPP Program

#Question id: 9236

#Unit 9. Diversity of Life Forms

Which of the following outcomes is caused by excessive nutrient runoff into aquatic ecosystems?
TLS Online TPP Program

#Question id: 3843

#Unit 3. Fundamental Processes

In DNA replication in E. coli, the enzyme primase is used to attach a 5 to 10 base ribonucleotide strand complementary to the parental DNA strand. The RNA strand serves as a starting point for the DNA polymerase that replicates the DNA. If a mutation occurred in the primase gene, which of the following results would you expect?
TLS Online TPP Program

#Question id: 8903

#Unit 9. Diversity of Life Forms

Terry detaches the snakelike organism from the fish and uses a knife to cut off its head. In doing so, its brain slides out onto the deck of the boat. Terry peers into the cut end of the head and notices that the brain had lain in a sort of pan-like structure that only partially surrounded the brain. What is the structure Terry is observing, and what is it made of?
TLS Online TPP Program

#Question id: 3817

#Unit 3. Fundamental Processes

DNA replication is studied in a newly discovered bacterium. It takes 30 min for the bacterium to complete a round of replication at 37oC. A Meselson-Stahl-type experiment was performed. The bacteria were grown for several generations in 14N-medium and then switched to 15N-medium. The DNA molecules were then analyzed.

If the mechanism of DNA replication in this bacterium were dispersive, what results would be found when the double-stranded DNA was analyzed in a CsCl gradient after two generations in 15N-medium?