Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Imagine a scenario where a novel amino acid is discovered. If the existing genetic code must accommodate this new amino acid without altering the existing amino acid assignments, what is the MOST likely mechanism for achieving this?
Expansion of the codon length from three to four bases
Overlapping reading frames
Reassignment of a rarely used codon
Modification of the ribosome structure
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.
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
The oxygen released during photosynthesis originates from which molecule, and which two elements are directly involved in this process?
Carbon and Oxygen
Hydrogen and Carbon
Hydrogen and Oxygen
Manganese and Chlorine
In photosynthesis, oxygen is produced from the splitting of:
Carbon dioxide molecules
Water molecules
Glucose molecules
ATP molecules
What is the evolutionary advantage of parthenogenesis in some plant species?
Increased genetic diversity
Enhanced seed dispersal
Rapid reproduction and colonization
Resistance to pathogens
Why are large, colourful, and fragrant flowers with nectar advantageous for insect pollination?
They attract insects and provide a food reward.
They are easily pollinated by the wind.
They are more resistant to diseases.
They produce more seeds.
Given below are two statements:
Statement I: RNA has a higher mutation rate than DNA.
Statement II: Viruses with RNA genomes and shorter lifespans exhibit faster mutation and evolution.
In light of the above statements, choose the correct answer from the options given below:
Both Statement I and Statement II are correct, and Statement II is the correct explanation of Statement I.
Both Statement I and Statement II are correct, but Statement II is not the correct explanation of Statement I.
Statement I is correct, but Statement II is incorrect.
Statement II is correct, but Statement I is incorrect.
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
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
