The function of snoRNAs in guiding rRNA modification by two types of sequences or boxes

Statement-I   C/D box of snoRNAs to guide methylation reactions

Statement-II  H/ACA box of snoRNAs to guide dihydrouridylylations

#Question id: 4946

#Unit 11. Evolution and Behavior

Although absolute distinctions between the ʺmost evolvedʺ protobiont and the first living cell are unclear, biologists generally agree that one major difference is that the typical protobiont could not

#Question id: 4947

#Unit 11. Evolution and Behavior

The first genes on Earth were probably

#Question id: 4948

#Unit 11. Evolution and Behavior

RNA molecules can both carry genetic information and be catalytic. This supports the proposal that 

#Question id: 4949

#Unit 11. Evolution and Behavior

What probably accounts for the switch to DNA-based genetic systems during the evolution of life on Earth?

#Question id: 4951

#Unit 11. Evolution and Behavior

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

#Question id: 4952

#Unit 11. Evolution and Behavior

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?