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Questions and Answers
What is the main function of most cell division?
What is the main function of most cell division?
- To produce genetically identical daughter cells
- To distribute genetic material to daughter cells (correct)
- To package DNA molecules into chromosomes
- To pass DNA accurately to the next generation
What is the role of cell division in single-celled organisms?
What is the role of cell division in single-celled organisms?
- To undergo embryonic development
- To pass DNA accurately to the next generation
- To produce new organisms (correct)
- To renew and repair
What is the function of cell division in fully grown multicellular eukaryotes?
What is the function of cell division in fully grown multicellular eukaryotes?
- To undergo embryonic development
- To pass DNA accurately to the next generation
- To renew and repair (correct)
- To produce new organisms
What is a genome?
What is a genome?
What is the packaging form of DNA molecules in a cell?
What is the packaging form of DNA molecules in a cell?
How many genes can a DNA molecule of a chromosome carry?
How many genes can a DNA molecule of a chromosome carry?
What distinguishes the genome of prokaryotic cells from eukaryotic cells?
What distinguishes the genome of prokaryotic cells from eukaryotic cells?
During cell division, the two sister chromatids of each duplicated chromosome separate and move into how many nuclei?
During cell division, the two sister chromatids of each duplicated chromosome separate and move into how many nuclei?
What is the narrow 'waist' of the duplicated chromosome called?
What is the narrow 'waist' of the duplicated chromosome called?
Which phase of the cell cycle involves cell growth and copying of chromosomes in preparation for cell division?
Which phase of the cell cycle involves cell growth and copying of chromosomes in preparation for cell division?
What is the complex of DNA and protein that makes up eukaryotic chromosomes called?
What is the complex of DNA and protein that makes up eukaryotic chromosomes called?
What is the division of the genetic material in the nucleus called?
What is the division of the genetic material in the nucleus called?
What is the variation of cell division that produces gametes called?
What is the variation of cell division that produces gametes called?
How many phases does interphase have?
How many phases does interphase have?
How many stages is mitosis conventionally broken down into?
How many stages is mitosis conventionally broken down into?
What is the division of the cytoplasm called?
What is the division of the cytoplasm called?
How many chromosomes do Somatic and Gamete cells have?
How many chromosomes do Somatic and Gamete cells have?
What is the function of meiosis?
What is the function of meiosis?
What are the five stages of mitosis?
What are the five stages of mitosis?
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Study Notes
Cell Division and Genetic Continuity
- The ability of organisms to produce more of their own kind is a characteristic that distinguishes living things from nonliving matter.
- Cell division plays several important roles in life, including the reproduction of single-celled organisms, embryonic development in multicellular eukaryotes, and renewal and repair in fully grown multicellular eukaryotes.
Cellular Organization of Genetic Material
- A cell's genome consists of all its DNA, which can be a single DNA molecule (in prokaryotic cells) or multiple DNA molecules (in eukaryotic cells).
- DNA molecules in a cell are packaged into chromosomes, each carrying several hundred to a few thousand genes.
Chromosomes and Cell Division
- Eukaryotic chromosomes consist of chromatin, a complex of DNA and protein that condenses during cell division.
- Every eukaryotic species has a characteristic number of chromosomes in each cell nucleus, with somatic cells having two sets and gametes having half as many.
- During cell division, DNA is replicated, and chromosomes condense, with each duplicated chromosome having two sister chromatids attached by cohesins.
Phases of the Cell Cycle
- The cell cycle consists of two main phases: mitotic (M) phase (mitosis and cytokinesis) and interphase (cell growth and copying of chromosomes in preparation for cell division).
- Interphase can be divided into three phases: G1 phase (cell growth), S phase (chromosome duplication), and G2 phase (cell growth).
Mitosis
- Mitosis consists of five stages: prophase, prometaphase, metaphase, anaphase, and telophase.
- During mitosis, the two sister chromatids of each duplicated chromosome separate and move into two nuclei, becoming chromosomes.
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