A feature of RNA that adds to its propensity to form double-helical structures is additional non-Watson–Crick base pairs. One such example is the G:U base pair, which has

#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?

#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.

#Question id: 4956

#XL - S Microbiology

Which measurement would help determine absolute dates by radiometric means?

#Question id: 4956

#XL - T Zoology

Which measurement would help determine absolute dates by radiometric means?

#Question id: 4957

#XL - S Microbiology

How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?

#Question id: 4957

#XL - T Zoology

How many half-lives should have elapsed if 6.25% of the parent isotope remains in a fossil at the time of analysis?