Exams › NEET › Biology

The following ratio is generally constant for a given species:

1. A + G
2. T + C
3. C + T
4. G + A

Correct answer: G + A

Solution

In double-stranded DNA, Chargaff’s rule says A pairs with T and G pairs with C, so the overall amount of purines (A + G) is characteristic for a species. That makes G + A the generally constant ratio among the options.

Related NEET Biology questions

• Which of the following is a transcription factor produced by a regulatory gene?
• Which of the following combination is false?
• Which scientist experimentally proved that DNA is the sole genetic material in bacteriophage?
• If the distance between two consecutive base pairs is 0.34 nm and the total number of base pairs of a DNA double helix in a typical mammalian cell is 6.6 × 10⁹ bp, then the length of the DNA is approximately
• Which of the following RNAs should be most abundant in animal cell?
• The final proof for DNA as the genetic material came from the experiments of:

⚔️ Practice NEET Biology free + battle 1v1 →