Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
The RNA world hypothesis posits RNA as the primary genetic material before DNA. Which of the following properties of RNA is LEAST supportive of this hypothesis?
RNA's ability to catalyze reactions (ribozymes)
RNA's ability to store genetic information
RNA's susceptibility to alkaline hydrolysis
The presence of RNA in key cellular processes like translation
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.
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
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 molecule is hypothesized to have been the primary genetic material in the RNA world?
DNA
RNA
Proteins
Lipids
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
What are RNA molecules with catalytic activity called?
Enzymes
Ribozymes
Ribosomes
Deoxyribozymes
Which of these is NOT a supporting argument for the RNA world hypothesis?
RNA's ability to self-replicate
RNA's catalytic properties
The existence of ribozymes
DNA's higher stability
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.
The RNA world hypothesis proposes that RNA was the primary genetic material in early life. Which of the following properties of RNA supports this hypothesis?
RNA is more stable than DNA.
RNA can act as both a carrier of genetic information and a catalytic enzyme.
RNA is double-stranded, providing redundancy in genetic information.
RNA cannot be degraded by enzymes.
