Prepare for NEET Biology Molecular Basis of Inheritance (DNA) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert help to analyze double helix structure, base pairing, and DNA as genetic material.
NEET Questions / Botany / Molecular Basis of Inheritance / Dna
During DNA replication, the enzyme responsible for removing RNA primers and replacing them with DNA is:
DNA polymerase III
DNA ligase
Primase
DNA polymerase I
A mutation changes a codon from UCG to UAG. This mutation is a:
Missense mutation
Silent mutation
Frameshift mutation
Nonsense mutation
Which of the following DNA sequences would have the highest melting temperature?
ATATATATAT
AGCTAGCTAG
GCATGCATGC
GCGCGCGCGC
In eukaryotic DNA replication, which of the following is NOT a function of topoisomerase?
Relieving torsional stress
Preventing supercoiling
Untangling DNA strands
Synthesizing RNA primers
A bacterial strain has a mutation in the gene encoding DNA gyrase. Which antibiotic would likely be ineffective against this strain?
Penicillin
Tetracycline
Ciprofloxacin
Erythromycin
If a DNA molecule contains 20% adenine, what percentage of guanine will it contain?
20%
30%
40%
50%
Which of the following statements regarding histones is INCORRECT?
They are rich in basic amino acids like lysine and arginine.
They have a net positive charge at physiological pH.
Post-translational modifications of histones neutralize their positive charge.
They form the core of nucleosomes.
Histones are crucial for DNA packaging. Which of the following is NOT a characteristic of these proteins?
Rich in basic amino acids
Positively charged
Primarily composed of carbohydrates
Synthesized mainly during S phase
Which statement about the synthesis of histones is TRUE?
It is coupled with DNA synthesis.
It occurs primarily during the G1 phase of the cell cycle.
It takes place within the nucleus.
It happens continuously throughout the cell cycle.
