The eukaryotic nucleus was discovered in 1831 by a Scottish botanist named Robert Brown (Bill...


The eukaryotic nucleus was discovered in 1831 by a Scottish botanist named Robert Brown (Bill Bryson, A Short History of Nearly Everything). It comes from a Latin word meaning kernel. Which statement regarding the eukaryotic nucleus is FALSE?

a. Intermediate filaments could be isolated from the nucleus of a eukaryotic cell (particularly an animal cell).

b. The nucleolus is a distinct, but not membrane-bound region within the eucaryotic nucleus. It is the site of rRNA synthesis.

c. Within the eukaryotic nucleus, basic proteins assist in the packaging of DNA.

d. Chromatin in which the DNA is relaxed and the genes are being actively expressed is called euchromatin.

e. Like the cytoplasmic membrane, the nuclear membrane is selectively permeable and only allows free passage of low molecular weight molecules such as {eq}\rm O_2 {/eq}.


The cell organelle, which is solely responsible for carrying out all the inheritance-related tasks and preserves an individual's genetic information, is called the nucleus. The prokaryotes and eukaryotes are divided based on presence of the nucleus. The presence of well-defined nucleolus and the nuclear membrane is one of the main characteristics of eukaryotic organisms.

Answer and Explanation: 1

The intermediate filaments are a part of the eukaryotic cytoskeleton but are generally absent in plants and fungi. The intermediate filaments are not found in the eukaryotic nucleus.

Therefore, the correct answer is option a.

Please note that:

  • Option b. is incorrect as it is true that eukaryotic nucleolus lack membrane.
  • Option c. is incorrect as it is correct that proteins help in the DNA packaging.
  • Option d. is incorrect as euchromatin actively express genes in the eukaryotic nucleus.
  • Option e. is incorrect as the membrane of the nucleus contains pores that selectively allow the passage of molecules.

Learn more about this topic:

What Is the Function of the Nucleus in Eukaryotic Cells?


Chapter 7 / Lesson 29

Learn about the nucleus in eukaryotic cells. Discover what a nucleus is, its structure, the function of the nucleus in eukaryotic cells, and the difference between eukaryotic cells and prokaryotic cells in terms of the nucleus.

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