TLS Online TPP Program

#Question id: 149


The pKaʹs of the side chain group and the α-carboxyl group of glutamate are 4.1 and 2.1, respectively. Which statement accounts for this difference?

#XL - T Zoology
  1. The side chain has more possible resonance structures.

  2. The α-carboxyl group has less steric hindrance and is therefore ionized more easily.

  3. The side chain is a different functional group than the α-carboxyl group.

  4. The α-carboxyl group is closer to the α-amino group than the side chain is.

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TLS Online TPP Program

#Question id: 4951

#XL - S Microbiology

The synthesis of new DNA requires the prior existence of oligonucleotides to serve as primers. On Earth, these primers are small RNA molecules. This latter observation is evidence in support of the hypothesized existence of

TLS Online TPP Program

#Question id: 4951

#XL - T Zoology

The synthesis of new DNA requires the prior existence of oligonucleotides to serve as primers. On Earth, these primers are small RNA molecules. This latter observation is evidence in support of the hypothesized existence of

TLS Online TPP Program

#Question id: 4952

#XL - S Microbiology

Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it?

TLS Online TPP Program

#Question id: 4952

#XL - T Zoology

Several scientific laboratories across the globe are involved in research concerning the origin of life on Earth. Which of these questions is currently the most problematic and would have the greatest impact on our understanding if we were able to answer it?

TLS Online TPP Program

#Question id: 4954

#XL - S Microbiology

If natural selection in a particular environment favored genetic systems that permitted the production of daughter ʺcellsʺ that were genetically dissimilar from the mother ʺcells,ʺ then one should expect selection for

I. polynucleotide polymerase with low mismatch error rates.

II. polynucleotide polymerases without proofreading capability.

III. batteries of efficient polynucleotide repair enzymes.

IV. polynucleotide polymerases with proofreading capability.

V. polynucleotide polymerases with high mismatch error rates.

TLS Online TPP Program

#Question id: 4956

#XL - S Microbiology

Which measurement would help determine absolute dates by radiometric means?