Q. Which of the following statements is not true?
a) Chromosomes are composed of DNA and Protein.
b) Nucleus of a cell does not play a role in cellular reproduction.
c) Chromosomes contain information for inheritance.
d) Functional segment of DNA is called genes.
Question from UPPSC Prelims 2024
Correct Answer: b) Nucleus of a cell does not play a role in cellular reproduction.
Explanation:
1. Option a: Chromosomes are composed of DNA and Protein.
– This statement is true. Chromosomes are made up of DNA, which carries genetic information, and proteins (mainly histones), which help in the packaging and organization of DNA.
2. Option b: Nucleus of a cell does not play a role in cellular reproduction.
– This statement is false. The nucleus plays a crucial role in cellular reproduction as it contains the genetic material (DNA) that is replicated and distributed to daughter cells during cell division (mitosis or meiosis). The nucleus is central to controlling and coordinating the process of reproduction.
3. Option c: Chromosomes contain information for inheritance.
– This statement is true. Chromosomes carry genes, which are the units of inheritance. These genes determine the traits that are passed from one generation to the next.
4. Option d: Functional segment of DNA is called genes.
– This statement is true. Genes are specific sequences of DNA that code for proteins or functional RNA molecules, and they are the functional units of heredity.
Thus, the incorrect statement is b) Nucleus of a cell does not play a role in cellular reproduction.
