Question

A well-defined nucleus is absent in
A. Prokaryotic cell
B. Eukaryotic cell
C. Animal cell
D. Plant cell

Answer 1

Hint:The nucleus is a genetic material-containing membrane-bound organelle. As such, by facilitating transcription and replication processes, it serves to maintain the cell's integrity. It is the largest organelle that takes up about a tenth of the entire volume of the cell inside the cell.

Complete answer:
The theory of cells notes that cells make up all living organisms. The fundamental, smallest, and most functional unit of life is the cell. The new cells are manufactured from pre-existing cells. You can further categorize cells as prokaryotes and eukaryotes. In contrast with eukaryotes, prokaryotes are known to be the smaller cells. Prokaryotic cells are surrounded by a characteristic cell wall with a plasma membrane whose composition can vary depending on the organism. There are distinct nuclei in eukaryotes bound by a nuclear membrane. They consist of organelles connected to the membrane, such as the endoplasmic reticulum and mitochondria. One that is devoid of well-defined nuclei and lacks membrane-bound organelles is a prokaryotic cell. Examples of eukaryotic cells consisting of membrane-bound organelles and a well-defined nucleus surrounded by the nuclear membrane are plant cells and animal cells. Therefore, option A is the correct answer as the prokaryotic cell lacks the presence of a well-defined nucleus. Algae, bacteria are some of the examples of prokaryotic cells.

So, option A) is the correct answer.

Note: With naked eyes, cells are not apparent since they are microscopic in dimension. The nucleus contains the genetic material called DNA that stands for deoxyribonucleic acid. It carries all the genetic information which is to be transferred from parents to offspring.