If the RNA world hypothesis is correct, which of the following would be the MOST likely scenario for the emergence of DNA?
DNA spontaneously arose independent of RNA and eventually outcompeted RNA.
Proteins evolved first and then catalyzed the formation of DNA from RNA.
RNA developed the ability to synthesize deoxyribonucleotides and polymerize them, eventually leading to DNA genomes.
Extraterrestrial DNA was introduced to Earth and replaced RNA.
Related Questions
If you were to analyze the RNA content of a human liver cell, which type of RNA would you expect to find in the highest concentration?
mRNA
tRNA
rRNA
miRNA
Which type of RNA is the most abundant in a typical animal cell?
mRNA
tRNA
rRNA
snRNA
Select the correct match:
G. Mendel - Transformation
Ribozyme - Nucleic acid
T.H. Morgan - Transduction
Recessive parent - Dihybrid cross
Ribozyme was discovered by
Kuhne
Duclaux
Cech
Altmann
Why is RNA considered a less stable molecule than DNA?
The presence of uracil instead of thymine.
The single-stranded nature of RNA.
The presence of the 2'-OH group in ribose.
The shorter length of RNA molecules.
Which prebiotic condition would have MOST significantly hindered the formation of stable RNA polymers in the early Earth environment?
An abundance of organic molecules like amino acids and nucleotides
The presence of clay minerals that can catalyze RNA polymerization
High concentrations of metal ions that catalyze RNA hydrolysis
Alternating cycles of wetting and drying
Why do RNA viruses, particularly those with short lifespans, tend to evolve more rapidly than DNA viruses?
Lower mutation rate in RNA and longer life span
Higher mutation rate in RNA and shorter life span
Lower mutation rate in DNA and shorter life span
Similar mutation rates in RNA and DNA
A scientist isolates RNA from a eukaryotic cell. A significant portion of the isolated RNA is found to be associated with large protein complexes. Which type of RNA is this most likely to be?
mRNA
tRNA
rRNA
snRNA
If a virus has an RNA genome, which characteristic would you MOST likely expect it to exhibit?
Slow evolution
High genomic stability
Long lifespan
Rapid evolution
Which process is essential for maintaining the chromosome number across generations in sexually reproducing organisms?
Mitosis
Meiosis
Binary Fission
Fragmentation
