We have looked at the structure of DNA in cells. There are some differences. Based on what we have learned, which of the following is TRUE? a. Mitochondrial chromosomal DNA is similar in structure to bacterial chromosomes. b. Prokaryotic chromosomes contain kinetochores whereas eukaryotic chromosomes have centromeres. c. All the chromosomes found in eukaryotes are linear while prokaryotic chromosomes are circular. d. Bacterial chromosomes have multiple origins of replication, thus allowing for short generation times, whereas eukaryotic chromosomes are replicated from a single origin. e. All the answers presented are TRUE. f. Telomeres are found on all chromosomes, both prokaryotic and eukaryotic, however only eukaryotic telomers shorten over time.
Structure and Composition of Cell Membrane
Despite differences in structure and function, all living cells in multicellular organisms are surrounded by a cell membrane. Just like the outer layer of the skin separates the body from its environment similarly, the cell membrane, also known as 'plasma membrane,' separates the inner content from its exterior environment.
Cell Membrane
The cell membrane is known by different names like plasma membrane or cytoplasmic membrane, or biological membrane. The term "cell membrane" was first introduced by C. Nageli and C. Cramer in the year 1855. Later on, in 1931, the term "plasmalemma" for cell membrane was given by J. Plowe. The cell membrane separates the cell's internal environment from the extracellular space. This separation allows the protection of cells from their environment.
Prokaryotes vs Eukaryotes
The cell is defined as the basic structural and functional unit of life. The cell membrane bounds it. It is capable of independent existence.
We have looked at the structure of DNA in cells. There are some differences. Based on what we have learned, which of the following is TRUE?
Mitochondrial chromosomal DNA is similar in structure to bacterial chromosomes.
Prokaryotic chromosomes contain kinetochores whereas eukaryotic chromosomes have centromeres.
All the chromosomes found in eukaryotes are linear while prokaryotic chromosomes are circular.
Bacterial chromosomes have multiple origins of replication, thus allowing for short generation times, whereas eukaryotic chromosomes are replicated from a single origin.
All the answers presented are TRUE.
Telomeres are found on all chromosomes, both prokaryotic and eukaryotic, however only eukaryotic telomers shorten over time.
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