Textbook Question
Define satellite DNA. Describe where it is found in the genome of eukaryotes and its role as part of chromosomes.
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7. DNA and Chromosome Structure
Bacterial and Viral Chromosome Structure
Multiple Choice
In prokaryotes, most chromosomal DNA molecules are located in the:
A
Nucleus surrounded by a nuclear envelope
B
Rough endoplasmic reticulum
C
Nucleoid region
D
Mitochondrial matrix
Verified step by step guidance1
Understand the structural differences between prokaryotic and eukaryotic cells. Prokaryotes lack membrane-bound organelles such as a nucleus.
Recall that in prokaryotes, the chromosomal DNA is not enclosed within a nuclear envelope, unlike in eukaryotes.
Identify the region in prokaryotic cells where DNA is concentrated, which is called the nucleoid region. This area is not membrane-bound but contains the genetic material.
Eliminate options that are specific to eukaryotic cells, such as the nucleus surrounded by a nuclear envelope and the rough endoplasmic reticulum, which are absent in prokaryotes.
Recognize that mitochondria and their matrix are also eukaryotic organelles, so the mitochondrial matrix is not the location of chromosomal DNA in prokaryotes.
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