Which process is essential for maintaining the chromosome number across generations in sexually reproducing organisms?
Mitosis
Meiosis
Binary Fission
Fragmentation
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
A diploid cell undergoes a type of cell division resulting in four haploid cells. This process is known as:
Mitosis
Meiosis
Binary fission
Budding
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
In the context of the RNA world hypothesis, what is the significance of ribozymes?
They store genetic information.
They are building blocks of proteins.
They demonstrate that RNA can catalyze reactions.
They transport amino acids.
A critical piece of evidence supporting the RNA world hypothesis is the existence of ribozymes. Which characteristic of ribozymes is MOST significant in this context?
Their sensitivity to RNase degradation
Their single-stranded structure
Their ability to catalyze both self-replication and peptide bond formation
Their presence in both prokaryotes and eukaryotes
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.
Ribozyme was discovered by
Kuhne
Duclaux
Cech
Altmann
What crucial role does RNA play in the RNA world hypothesis?
Only genetic information storage
Only catalysis
Both genetic information storage and catalysis
Structural support
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 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.
