TLS Online TPP Program

#Question id: 4129


Which of the following statements about the tRNA that normally accepts phenylalanine is false?  (mRNA codons for phenylalanine are UUU and UUC.)

#SCPH01 Biochemistry
  1. It interacts specificially with the Phe synthetase.

  2. It will accept only the amino acid phenylalanine.

  3. Its molecular weight is about 25,000.

  4. The tRNA must contain the sequence UUU.

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TLS Online TPP Program

#Question id: 12926

#SCPH05 I Biotechnology

PCR is undertaken with a fluorescence reporter / quencher pair called______

TLS Online TPP Program

#Question id: 9279

#SCPH05 I Biotechnology

During the normal functioning of the photosynthetic system, the chemical reactions in which water is oxidized to oxygen, NADP+ is reduced to NADPH, and ATP is formed almost all the reactions up to NADP+ reduction take place in

TLS Online TPP Program

#Question id: 1644

#SCPH01 Biochemistry

What is the single best defining feature of a lymphocyte?

TLS Online TPP Program

#Question id: 11921

#SCPH06 I Botany

Which of the following would be considered to be a natural population in a pond? 

TLS Online TPP Program

#Question id: 13091

#SCPH01 Biochemistry

To express a yeast gene in E. coli, your task is to design a strategy to insert the yeast gene into the bacterial plasmid. Below is a map of the area of the yeast genome surrounding the gene in which you are interested.
 
The distance between each tick mark placed on the line above is 100 bases in length
Below are the enzymes you can use, with their specific cut sites shown 5’-XXXXXX-3’ 3’-XXXXXX-5’
 
The plasmid is 5,000 bases long and the two farthest restriction enzyme sites are 200 bases apart. The plasmid has an ampicillin resistance gene somewhere on the plasmid distal from the restriction cut sites.
                              
You do the digestion of the insert and the vector and then ligate the two digestions together. You then transform the ligation into bacteria and select for ampicillin resistance. You get three colonies on your transformation plate. You isolate plasmid from each one and cut each plasmid with the enzyme XbaI. You then run your three digestions on an agarose gel and see the following patterns of bands. Describe what each plasmid actually was that was contained in each of the three colonies.
 
Which colony’s plasmid do you actually want to use for your studies?