Question

Karyolymph is a
A. Nucleus sap
B. SPM membrane
C. Nuclear pore
D. None of the above

Answer 1

Hint: The word karyon refers to the cell nucleus or cell centre. Karyolymph is a gel or liquid component present in the nucleus of the cells where stainable elements are suspended. Now it is known as euchromatin. Similar to this there is another word called karyotheca that refers to the nuclear envelope.

Complete answer:
 The nucleus is a double-layered, and membrane-bound organelles. In the nucleus, the genetic material is present in eukaryotic organisms. It helps to maintain the integrity of the cell by facilitating the replication and transcription processes. It is known as the command centre of the cell because it contains the genetic material.

The important components of a nucleus include-
-Phospholipid bilayer membrane
-Nucleoplasm
-Nucleolus
-Chromatic

Nuclear membrane – Like other cell organelles nucleus is also the membrane-bound organelles. It is made up of the double-layered structure similar to the cell membrane. The double-layered structures consist of phospholipids that form the lipid bilayer nucleus envelope. The nuclear pores are present on the nuclear membrane. The pores help in transportation of the material from inside of the cells to the outside of the cells.
Nucleoplasm- It is also known as nucleus sap or karyoplasm or Karyolymph. It is a kind of protoplasm which is composed of digestive juices, salts, minerals, enzymes and many other organic molecules. Apart from this it also protects the shape and structure of the nucleolus and chromosomes, it acts as the cushion.
Nucleolus- The nucleolus is a dense and important structure in the nucleus. It lacks its membrane. It breaks up to form the special section of the chromosomes after mitosis. It is a site for the processing of the ribosomal gene and also for the transcription.
Chromosomes- chromosomes are present in the nucleus; it is thread-like structure and made up from the histone protein and strands of the DNA. The main parts of the chromosomes are kinetochores, telomeres, and chromatids.

Hence, the correct answer is option (A).

Note: In most of the book shown the structure of the nucleus is spherical. Although, it may appear as flattened, irregular or ellipsoidal. It may vary depending upon the type of the cells. The shape of the nucleus also changes when the cell matures. The nucleus is columnar epithelium cells so it appears more elongated as compared to other cells.