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Lesson Worksheet: DNA in Prokaryotes Biology
In this worksheet, we will practice describing the structures that contain DNA within prokaryotic cells.
Which of the following statements correctly compares the DNA of eukaryotic cells with the DNA of prokaryotic cells?
- AEukaryotic DNA forms a single chromosomal loop, whereas prokaryotic DNA forms many small, circular plasmids.
- BEukaryotic chromosomes contain specialized proteins that help form chromatin, whereas most prokaryotic chromosomes do not.
- CBoth eukaryotic and prokaryotic DNA condense to form X-shaped chromosomes before the cell divides.
For the following statements about the structure of DNA in prokaryotes, state whether they are true or false.
Chromosomal DNA is linear in shape.
Chromosomal DNA is found within the nucleosome.
Extrachromosomal DNA is found in the form of small, circular plasmids.
Which of the following best describes prokaryotic plasmids?
- ADNA that coils itself around nucleosomes to form small rings
- BA thread-like section of DNA that has been coiled and condensed into an X shape
- CDNA outside of the chromosome that forms small, circular molecules
- DAdditional RNA that forms a large, coiled loop
- EA long molecule of single-stranded DNA
The majority of DNA in prokaryotes is chromosomal DNA. Which of the following best describes the structure of this chromosomal DNA?
- AA single, circular, double-stranded DNA molecule
- BA long, linear section of double-stranded DNA
- CA short, linear, single-stranded DNA molecule
- DMultiple small, circular loops of DNA
- EA thread-like section of DNA that has been coiled and condensed into an X shape
Which of the following statements about DNA in prokaryotic cells is correct?
- AThe DNA is coiled compactly, so if it was stretched out, it would be much longer than the cell itself.
- BThe DNA is found loosely floating within the cell and is formed of less than 100 nucleotides.
- CThe majority of the DNA does not code for proteins and has no obvious function.
- DThe nitrogenous bases that are contained in the DNA are A, T, G, and U.
- EThe DNA is tightly wound around specialized proteins called histones and coiled into chromatin.
Mitochondria, organelles found in eukaryotic cells (shown in the figure), have their own circular loops of DNA. According to the endosymbiotic theory, what does this suggest about the evolution of mitochondria?
- AMitochondria have had many mutations in their DNA, so they now resemble the structure of bacterial DNA.
- BMitochondria have evolved to be separate, parasitic organelles within the cells of a eukaryote.
- CMitochondria were previously separate, prokaryotic organisms before being incorporated in eukaryotes.
The diagram provided shows the simplified structure of a bacterial cell. Which letter indicates the chromosomal DNA?
The diagram provided shows a simplified structure of a bacterial cell. Which letter indicates a plasmid?
Chloroplasts, organelles found in plant cells, have their own DNA that forms circular strands. According to the endosymbiotic theory, what does this suggest about the evolution of chloroplasts?
- AChloroplasts were previously separate, prokaryotic organisms.
- BChloroplasts have evolved to be separate, parasitic organelles within the cells of a plant.
- CChloroplasts have had many mutations in their DNA, so they now resemble the structure of bacterial DNA.