g1 phase in the cell cycle
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Cell cycle - Wikipedia, the free encyclopedia
The cell cycle consists of four distinct phases: G1 phase, S phase (synthesis), G2 phase (collectively known as interphase) and M phase (mitosis). ...
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Question:Does a cell in metaphase II have the same mass of DNA as a diploid cell in the G1 phase of the cell cycle?
The events of mitosis in plants and animals are very similiar with the exception of the abscense of centrioles in plants. How has the absence of centrioles in plant cells influenced scientists thinking about the function of centrioles in mitosis?
Answers:The cell in the G1 phase would have the same mass of DNA as in the metaphase 2 stage
Question:a.G0, G1, G2, S, M, cytokinesis
b.G0, G1, S, M, cytokinesis
c.G0, M, S, G1, G2, cytokinesis
d.G0, G1, S, G2, M, cytokinesis
Question:Interphase is the longest stage of the cell cycle.
My question is what cell cycle phases are the equivalent of this stage(interphase)?
Also, i'm curious about the speed of mitosis in general. Is it in general fast or slow? Or are all the stages of mitosis completely different speeds?
Thank you for any help!
Answers:The other cell cycle stage is M-phase (mitosis) and it is only 10% of the cell cycle. it is also split into smaller stages. However no stage comes close to being as Interphase ( the other 90% of the cell cycle). Finally cell cycle speed varies between organism, stage in its life cylce, and specific tissue in that organism. In bacteria it is around 20 min to an hour. buth in humans it can be around 24hours.
Question:Scientists isolate cells in various phases of the cell cycle. They find a group of cells that have 1 1/2 times more DNA than do G1 phase cells. The cells of this group are in ________.
a. M phase.
b. S phase.
c. the G2 phase of the cell cycle.
d. the process of cytokinesis.
Actin filaments have polarity. This means that the two ends can be identified due to structural differences. The plus end is the end to which subunits are added more rapidly, or the end of polymerization. Which of the following would enable you to identify the plus end of actin filaments?
a. Add radiolabeled actin subunits to a mixture of actin filaments in which conditions favor depolymerization.
b. Determine the ionic charge of the ends of the actin filaments.
c. Add radiolabeled actin subunits to a mixture of actin filaments in which conditions are favorable for polymerization.
Amoeba move by crawling over a surface (amoeboid movement). Which one of the following processes is part of amoeboid movement?
a. setting up microtubule extensions that vesicles can follow in the movement of cytoplasm
b. polymerization or extension of actin filaments to form bulges in the plasma membrane
c. reinforcing the pseudopod with intermediate filaments
Which of the following cytoskeletal proteins are important in changing cell shape or location (any type of cell movement)?
a. Microfilaments are the only cytoskeletal proteins important in cell movement.
b. Microfilaments and myosin are among the cytoskeletal proteins important in cell movement.
c. Intermediate filaments are the only cytoskeletal proteins important in cell movement.
d. Microfilaments, microtubules, and intermediate filaments are equally important in cell movement.
What is the function of keratin, an important intermediate filament?
a. provides nutrients to neural cells of the brain and spinal cord
b. reinforces moveable joints
c. enables the heart to contract as a unit
d. imparts impermeability to the skin and the ability to withstand mechanical stress
Researchers tried to explain how vesicular transport occurs in cells by attempting to assemble the transport components. They set up microtubular tracks along which vesicles could be transported, and they added vesicles and ATP (because they knew the transport process requires energy). Yet, when they put everything together, there was no movement or transport of vesicles. What were they missing?
a. contractile microfilaments
b. an axon
c. endoplasmic reticulum
d. motor proteins
How is the structure of kinesin related to its function?
a. Kinesin has two heads to attach to the vesicle being moved, and a tail region that attaches to microtubules.
b. Kinesin has a tail region that binds to vesicles and two heads that can attach to microtubules.
c. Kinesin has two intertwined polypeptides that make up the stalk and enable it to contract and shorten.
d. The kinesin tail has an ATP binding site to fuel its activities.
Motor proteins require energy in the form of ATP. ATP hydrolysis results in a conformational change that allows the protein to move along microtubular tracks (pathways). What structural component of the motor protein contains the ATP binding site and, therefore, changes shape to enable movement?
a. the stalk
b. a location midway between the vesicle binding site and the portion of the molecule that binds to microtubular tracks
c. the portion of the molecule that binds to the vesicle being transported
d. the portion of the molecule that binds to the microtubular track along which the vesicle is being transported
Flagella are found in both eukaryotic cells and prokaryotic cells. Despite the functional similarities of all flagella, scientists suspect that eukaryotic and prokaryotic flagella have evolved independently. Why don't they think there is a common evolutionary origin for prokaryotic and eukaryotic flagella?
a. Prokaryotic flagella are an adaptation to scarce nutrient supply, whereas eukaryotic flagella are designed to protect.
b. Prokaryotic flagella do not protrude outside the cell wall, whereas eukaryotic flagella are membrane-bound extensions of cytoplasm.
c. Prokaryotic flagella do not require energy in the form of ATP.
d. Prokaryotic flagella move by rotating, whereas eukaryotic flagella undergo an undulating motion. Furthermore, eukaryotic flagella are covered by a plasma membrane and prokaryotic flagella are not.
Spherocytosis is a defect associated with a defective cytoskeletal protein in red blood cells. What do you suspect is one consequence of defective cytoskeletal proteins in red blood cells?
a. a lack of oxygen-transporting proteins in the cell
b. insufficient energy supply in the cell
c. adhering of blood cells to blood-vessel walls, causing the formation of plaque
d. abnormal cell shape
Answers:just make your own homework and ask specific questions only instead of just your homework
Biology: The Eukaryotic Cell Cycle :www.mindbites.com Professor Wolfe gives an overview of the full cycle of eukaryotic cells. There are consistencies in the cell cycles of almost all eukaryotic cells. Why do cells divide? All the cells divide to maintain their volume to surface are ratio. When cells divide, the genetic information in the offspring cells must be identical to the genetic information in the parent cell, so this genetic information must first be organized and doubled. This process is called 'packing' and forms chromasomes, which are 2 molecules of identical DNA. Ninety percent of a cell's life cycle is spent in the period called "interphase," which is where the cell grows (known as the G1 or Gap 1 phase), DNA replicates (known as the S phase for DNA synthesis), and the cell prepares to divide (known as the G2 or Gap 2 phase). A eukaryotic cell will only spend ten percent of its life cycle dividing, or "replicating." Taught by Professor George Wolfe, this lesson was selected from a broader, comprehensive course, Biology. This course and others are available from Thinkwell, Inc. The full course can be found at www.thinkwell.com The full course covers evolution, ecology, inorganic and organic chemistry, cell biology, respiration, molecular genetics, photosynthesis, biotechnology, cell reproduction, Mendelian genetics and mutation, population genetics and mutation, animal systems and homeostasis, evolution of life on earth, and plant systems and homeostasis. Founded in 1997, Thinkwell has ...
Eukaryotic Cell Cycle | Biology | Genetics :To purchase this DVD please visit www.greatpacificmedia.com Segment from the program Cellular Reproduction: Mitosis, Cytokinesis, and the Cell Cycle DVD Description Our Mitosis DVD starts by introducing the cell cycle and briefly describing the process of binary fusion in prokaryotic cells before going on to a detailed look at the eukaryotic cell cycle from the G1, S and G2 phases of interphase through the prophase, metaphase, anaphase and telophase phases of mitosis. The difference between cytokinesis in animal and plant cells is then illustrated. The program concludes by explaining why an understanding of cellular division is critical to: conquering cancer, cloning organs, and perhaps even reversing aging.