Question

Which one of the following is not a part of the nucleus?
A. Chromatin
B. Nucleolus
C. Centrosome
D. Nucleoplasm

Answer 1

Hint: The nucleus is the largest component of the cell which contains the major portion of the genetic material DNA in the eukaryotes and it is bounded by a membrane.

Complete answer:

Nucleus contains chromatin which is also known as nucleoprotein fibers, a nuclear matrix which is also known as the nucleoplasm, and the nucleolus which is a sphere-like structure. The chromatin and the nucleolus are present in the nucleoplasm and the nucleolus is not bounded by any membrane.
Centrosome is a structure which is made up of two cylindrical centrioles which are perpendicular to each other and form a cartwheel like structure, This centrosome is the basal body of spindle fibers, flagella, and cilia.

Option(A): Chromatin is present in the nucleus and it contains DNA and histone proteins.

Option(B): Nucleolus is a central and important part of the nucleus.

Option(C): Centrosome forms the basal part of cilia and flagella and is not present in the nucleus.

Option(D): Nucleoplasm refers to the cytoplasm of the nucleus.

Hence, the correct answer is option (C)

Note: 1.The partition between the cytoplasm of the cell and the nucleus is known as the nuclear envelope which is a two-layered membrane with a little space known as perinuclear space.
2.The Nuclear envelopes have small pores which are known as nuclear pores and their main function is the transportation of RNA or protein between the nucleus and cytoplasm.