TLS Online TPP Program

#Question id: 4001


Which is not true about the lac repressor?

#Unit 1. Molecules and their Interaction Relevant to Biology
  1. Its gene is part of the lac operon and is transcribed along with lacZ, lacA and lacY.

  2. When it binds to DNA, it forms a loop-type structure.

  3. It likely blocks both RNA polymerase binding as well as transcription initiation.

  4. It binds to DNA by interaction of an α-helix with the major groove.

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TLS Online TPP Program

#Question id: 13085

#Unit 13. Methods in Biology

The most common microsatellite sequence encountered in human genome is the sequence 

TLS Online TPP Program

#Question id: 4095

#Unit 3. Fundamental Processes

Many eukaryotic genes contain a large number of exons. Correct splicing of such genes requires that neighboring exons be ligated to one another; if they are not, exons will be left out. One early proposal suggested that the splicing machinery bound to a splice site at one end of an intron and scanned through the intron to find the splice site at the other end. Such a scanning mechanism would guarantee that an exon was never skipped. This hypothesis was tested with one minigene with a duplicated 3ʹ splice site. Find diagram of the products you expect from minigene if the splicing machinery binds to a 3ʹ splice site and scans toward a 5ʹ splice site.

TLS Online TPP Program

#Question id: 13103

#Unit 13. Methods in Biology

With the help of DNA fingerprinting which can be used to determine paternity. There are three babies (Baby A, Baby B and Baby C) in a maternity ward, and three sets of confused and worried parents. (Father and Mother #1 are a couple, as are Father and Mother #2, and Father and Mother #3.) 
You do each PCR reaction and load each one into a separate well of an agarose gel, and then run the gel.
 
 

Why is it that some people show only one band?

TLS Online TPP Program

#Question id: 26545

#Unit 3. Fundamental Processes

What is the nature of mRNA decay

TLS Online TPP Program

#Question id: 19051

#Unit 13. Methods in Biology

Select the correct statement regarding paper chromatography from the following.