Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
A researcher isolates a nucleic acid sample and finds it contains 22% adenine. Which of the following is the MOST LIKELY composition of the sample?
22% thymine, 28% guanine, 28% cytosine
28% thymine, 22% guanine, 22% cytosine
22% uracil, 28% guanine, 28% cytosine
Equal amounts of all four bases
The double-helix structure of DNA is stabilized by:
Covalent bonds
Ionic bonds
Hydrogen bonds
Van der Waals forces
Which of the following DNA sequences would have the highest melting temperature?
ATATATATAT
AGCTAGCTAG
GCATGCATGC
GCGCGCGCGC
If a segment of double-stranded DNA has 20% adenine, what percentage of guanine would it contain?
20%
30%
40%
50%
Which of the following nitrogenous bases is NOT found in DNA?
Adenine
Guanine
Cytosine
Uracil
The bond that links adjacent nucleotides in a DNA strand is called a:
Peptide bond
Glycosidic bond
Hydrogen bond
Phosphodiester bond
If a DNA molecule contains 20% adenine, what percentage of guanine will it contain?
20%
30%
40%
50%
If the distance between two consecutive base pairs is nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is bp, then the length of the DNA is approximately:
2.2 m
2.0 m
2.5 m
1.8 m
If the total number of base pairs in a human DNA is bp and each base pair extends for nm, what would be the approximate length of the DNA if it were stretched out?
2.2 m
0.22 m
22 m
220 m
