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TLS Online TPP Program

#Question id: 4144

The Wobble Hypothesis suggests that:

#SCPH28 | Zoology

  1. flexibility in base pairing occurs between the third base of a codon and the corresponding base in its anticodon 

  2. flexibility in base pairing only occurs for inosine as it can pair with U, C or A at its second position 

  3. flexibility in base pairing occurs between the second first base of a codon and the corresponding base in its anticodon 

  4. flexibility in base pairing only occurs for inosine as it can pair with U, G or A as its third position 

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TLS Online TPP Program

#Question id: 15658

#SCPH06 I Botany

You are studying a new strain of E. coli that can utilize the disaccharide melibiose very efficiently. You find that utilization depends on the enzyme melibiase, which is encoded by the gene Mel1. Mel1 is not expressed unless melibiose is present in the growth medium.
Next, you isolate a third mutant, MelC–, which gives constitutive melibiase expression. The MelC– mutation is closely linked to Mel1 and MelB–. Genetic tests of the MelC– mutation yield the following:
 
As above, classify the MelC– mutation in terms of its basic genetic properties and explain how you arrived at your conclusions.
TLS Online TPP Program

#Question id: 15661

#SCPH12 I Genetics

Which of the following is NOT true of a maternal effect gene?
TLS Online TPP Program

#Question id: 15666

#SCPH12 I Genetics

Which of the following could NOT be used to describe a sex limited trait:
TLS Online TPP Program

#Question id: 15668

#SCPH12 I Genetics

How is genetic transfer different from sexual reproduction?
TLS Online TPP Program

#Question id: 15669

#SCPH12 I Genetics

 Which of the following is a description of generalized transduction?
TLS Online TPP Program

#Question id: 15670

#SCPH12 I Genetics

A researcher would like to map the location of galE and trpA genes in a new species of bacterium that appears to be closely related to E. coli. He decides to use cotransduction, and generates appropriate donor and recipient strains. He is disappointed when cotransduction is not seen in his experiement. What is the most reasonable explanation for this situation?