10 Questions
What are responsible for one of the five fundamental attributes of life?
Mitotic and meiotic cell divisions
In which phase of the cell cycle does DNA replication start at a specific sequence called origin of replication (ori)?
S phase
What is responsible for the division of the cytoplasm into two distinct daughter cells?
Cytokinesis
What are the two types of cell division in eukaryotes?
Mitosis and meiosis
What is responsible for the processes of growth, wound repair, and reproduction in eukaryotic cell replication?
Eukaryotic cell replication
What is the function of the cytoskeleton?
Maintains cell shape and supports cell structure
What are the three major types of cytoskeletal components?
Actin filaments, intermediate filaments, and microtubules
What is the diameter of microtubules?
25 nm
How does cell signaling regulate cytoskeleton function?
Cells use cell-surface receptors to sense external signals and activate specific cytosolic signaling pathways
What are the biophysical and biochemical properties shown for each filament in the cytoskeleton overview?
Actin and sites of actin attachment to the substratum
Study Notes
Cell Division and Cytoskeleton
- Five fundamental attributes of life: one of which is responsibility, but the specific one is not mentioned.
- DNA replication: starts at a specific sequence called origin of replication (ori) in the S phase of the cell cycle.
Cell Division in Eukaryotes
-
Two types of cell division:
- Mitosis: responsible for the division of the cytoplasm into two distinct daughter cells.
- Meiosis: (not explicitly mentioned, but implied as the second type of cell division)
Cytoskeleton Function
- Cytoskeleton responsibility: responsible for the processes of growth, wound repair, and reproduction in eukaryotic cell replication.
- Cytoskeleton function: provides structural support, shape, and mechanical resistance to cells.
Cytoskeletal Components
-
Three major types of cytoskeletal components:
- Microfilaments
- Intermediate filaments
- Microtubules
- Microtubules: have a diameter of approximately 24 nanometers.
Cell Signaling and Cytoskeleton
- Cell signaling: regulates cytoskeleton function.
- Cytoskeleton overview: biophysical and biochemical properties vary for each filament type.
Test your knowledge on cell cycle phases, control mechanisms, G1 checkpoint, Rb protein impact, eukaryotic chromosomes, mitosis, and cytokinesis with this quiz. Sharpen your understanding and recall of key concepts related to chromosomes and the cell cycle.
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