Question
Which of the following statements is NOT true regarding the nucleus?
The correct answer is
The nuclear membrane is a non-porous and rigid structure.
Let's analyze each statement regarding the nucleus to determine which one is NOT true.
- The first statement is: "The nuclear membrane is a double-layered structure." This statement is true. The nuclear membrane, also known as the nuclear envelope, is indeed a double-layered structure. It consists of two lipid bilayers that protect and encase the nucleus.
- The second statement is: "The nuclear membrane is a non-porous and rigid structure." This statement is not true. The nuclear membrane is porous and allows the transport of molecules between the nucleus and the cytoplasm through nuclear pores. The structure is also not rigid but rather flexible to allow these exchanges.
- The third statement is: "The nucleus plays a major role in cell division." This statement is true. The nucleus is crucial during cell division as it contains the cell's genetic material, which needs to be accurately divided between the daughter cells.
- The fourth statement is: "The nucleus contains chromosomes." This statement is true. Chromosomes, which carry genetic information, are located inside the nucleus.
Based on the analysis above, the statement "The nuclear membrane is a non-porous and rigid structure." is the incorrect one, as it falsely describes the characteristics of the nuclear membrane.
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Important Questions from Nucleus
- The binding energy B of a nucleus is approximated by the formula B = a 1 A − a 2 A 2/3 − a 3 Z 2 A −1/3 − a 4 (A − 2Z) 2 A −1 where Z is the atomic number and A is the mass number of the nucleus. If \(\rm\frac{a_4}{a_3}\) ≃ 30, the atomic number Z for naturally stable isobars (constant value of A) is
What are the main constituents of biogas?
The energy equivalent of mass associated with the rest mass of an electron, is nearly:
- Considering that the radius of an atomic nucleus, $R$, can be approximated by the formula $R = R_0 A^{1/3}$, where $R_0 \approx 1.2 \times 10^{-15}$ m is the Fermi radius constant and $A$ is the mass number, and the average mass of a single nucleon is approximately $1.67 \times 10^{-27}$ kg. Calculate the approximate order of magnitude of nuclear matter density in $\text{kg/m}^3$.
- The mass number of argon is 40. Which one of the following statements is correct?
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