Related Questions
Which of the following contributes to the faster evolution of RNA viruses?
High mutation rate during replication
Presence of a DNA intermediate
Slower replication rate
Complex capsid structure
Which of the following is NOT a reason why rRNA is the most abundant RNA in animal cells?
It is a structural component of ribosomes.
It is required for protein synthesis.
It carries the genetic code from DNA to the ribosome.
Multiple copies of rRNA genes exist in the genome.
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
Ribozyme was discovered by
Kuhne
Duclaux
Cech
Altmann
The RNA world hypothesis suggests that self-replicating RNA molecules were crucial for the origin of life. What is a major challenge to the idea of self-replicating RNA?
RNA's inherent stability
The simplicity of RNA's structure
The abundance of free nucleotides in early Earth environments
The complexity of RNA replication without enzymatic assistance
During periods of active protein synthesis, which type of RNA experiences the highest increase in concentration within a cell?
mRNA
tRNA
rRNA
miRNA
Ribozymes are an important piece of evidence supporting the RNA world hypothesis. What is the primary function of a ribozyme?
Storing genetic information
Transporting amino acids
Catalyzing biochemical reactions
Forming cell membranes
In the context of the RNA world hypothesis, the discovery of catalytic RNA molecules (ribozymes) was crucial. Which of the following functions performed by ribozymes is MOST relevant to supporting the hypothesis?
Degrading proteins, demonstrating early enzymatic activity
Catalyzing RNA polymerization, suggesting a mechanism for self-replication
Splicing RNA, indicating a role in gene regulation
Synthesizing amino acids, demonstrating prebiotic metabolic pathways
Which feature of some RNA molecules supports their potential role as early catalysts?
Linear, unfolded structure
Inability to bind to other molecules
Specific three-dimensional structures
Lack of chemical reactivity
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.
