Which of the following is structural subunit of DNA?
Protein
Carbohydrate
RNA
Nucleotides
Related Questions
Statements
I. The four nucleotide bases are not necessarily present in DNA in exact equal
proportions.
II. The total amount of purines are equal to the total amount of pyrimidines.
III. DNA ligase enzyme act to hydrolyse or breakdown a polynucleotide chain into
its component nucleotides.
IV. Nuclease enzymes are capable of restoring an intact DNA duplex.
Of the above statements
II is correct, but I, III and IV are wrong
I and II are wrong but III and IV are correct
I, II and III are correct but IV is wrong
I and II are correct but III and IV are wrong
Length of haploid content of human DNA
Guanine constitutes 15% of the nucleotides in a sample of DNA. What percentage of the nucleotides in this sample will be Adenine?
15%
25%
35%
20%
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
The distance between two base pairs in DNA is
34Å
3.4Å
0.34Å
20Å
The backbone of a polynucleotide chain is formed due to?
Sugar
Phosphate
Nitrogen base
Both 1 and 2
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
Number of carbons in ring of deoxyribose sugar is
4
5
3
6
Antiparallel strands of a DNA molecule means that
One strand turns anti-clockwise
The phosphate groups of two DNA strands at their ends, share the same position
The phosphate groups at the start of two DNA strands are in opposite position(pole)
One strand turns clockwise
Chemical basis of heredity is?
DNA
RNA
Histones
None
