MHT CET Medical202622 April 2026Morning ShiftBiologyCell - The Unit of LifeActual
The approximate size of a nucleus in a typical mammalian cell is about ______ meter and the length of DNA molecule is about ______ meters respectively.
Options
- A10⁻⁹ and 4.8
- B10⁻⁶ and 3.8
- C10⁻⁶ and 2.2
- D10⁻² and 1.2
Correct answer
C. 10⁻⁶ and 2.2
Step-by-step solution
The length of the DNA double helix in a typical mammalian cell is calculated by multiplying the total number of base pairs with the distance between two consecutive base pairs. Length of DNA = 6.6 10⁹ 0.34 10⁻⁹ m = 2.24 m 2.2 m. The dimension of a typical mammalian nucleus is approximately 10⁻⁶ m. Thus, the approximate size of a nucleus is 10⁻⁶ m and the length of the DNA molecule is 2.2 m. Answer: 10⁻⁶ and 2.2