Concept explainers
To review:
The differences between nucleoids in bacteria and the nucleus in eukaryotes with respect to cellular membranes.
Introduction:
All living forms have
Explanation of Solution
The bacterial chromosome is folded and compressed to be able to fit inside a cell. This highly-folded chromosome is referred to as a nucleoid. The differences between the nucleoid in bacteria and the nucleus in eukaryotes have been tabulated below:
Bacterial nucleoid | Eukaryotic nucleus |
It does not have a membrane. | It is enclosed within a membrane. |
The DNA (deoxyribonucleic acid) is in contact with the cytoplasmic content. | The DNA is isolated from the contents of the cytoplasm. |
Therefore, it can be concluded that a nucleoid comprises a compressed chromosome and is not enclosed in a membrane while the eukaryotic nucleus has a membrane, which turns it into an organelle.
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Chapter 10 Solutions
Genetics: Analysis and Principles
- The nucleus houses and protects the DNA within eukaryotic cells. To keep the DNA safe, the passage of materials in and out of the nucleus is highly restricted. Explain the route by which molecules can enter/exit the nucleus. In addition, briefly describe 5 types of proteins that are allowed entry into the nucleus and their roles.arrow_forwardThe nucleus a) has a single membrane and compartmentalizes the genetic material b) has a double membrane joined by nuclear pores, is continuous with the endoplasmic reticulum membrane, and compartmentalizes the nuclear genetic material c) has a double membrane joined by nuclear pores, is continuous with the smooth endoplasmic reticulum membrane only, and compartmentalizes the nuclear genetic material d) None of these are accuratearrow_forwardWhich term among A-D is not correctly matched with its definition? A) O Slime layer: loose assemblage of polysaccharide material external to the cell envelope B) O Polysome or polyribosome formation: multiple ribosomes binding to a messenger RNA transcript C) O Replisome: two of these complexes working in opposite directions are needed to copy the bacterial chromosome D) O Nucleoid: cytoplasmic area containing the bacterial chromosome E) OA-D are all correctly matchedarrow_forward
- How different are the location of ribosomes in eukaryotic and in prokaryotic cells?arrow_forwardWhy is it an advantage for eukaryotic cells to have different compartments (aka organelles) in the cell (separated by membranes) with different environments (ex: different pH’s, different enzymes present, etc)?arrow_forwardWhat is a dikaryon? When and where is it formed?arrow_forward
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