Which of the following statements correctly describes how cells progress through the various stages of the cell cycle? Controlled expression and degradation of both cyclins and cdks Controlled expression and degradation of only cyclins Fixed time frame for each phase of the cell cycle independent of protein expression Controlled expression and degradation of only cdks

Which of the following statements correctly describes how cells progress through the various stages of the cell cycle? Controlled expression and degradation of both cyclins and cdks Controlled expression and degradation of only cyclins Fixed time frame for each phase of the cell cycle independent of protein expression Controlled expression and degradation of only cdks

Biochemistry

6th Edition

ISBN:9781305577206

Author:Reginald H. Garrett, Charles M. Grisham

Publisher:Reginald H. Garrett, Charles M. Grisham

Chapter28: Dna Metabolism: Replication, Recombination, And Repair

Section: Chapter Questions

Problem 19P: Figure 28.11 depicts the eukaryotic cell cycle. Many cell types â€œexitâ€� the cell cycle and...

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Figure 28.11 depicts the eukaryotic cell cycle. Many cell types â€œexitâ€� the cell cycle and donâ€™t divide for prolonged periods, a state termedG0; some, for example neurons, never divide again. a. In what stage of the cell cycle do you suppose a cell might be when it exits the cell cycle and enters G0? b. The cell cycle is controlled by checkpoints, cyclins, and CDKs. Describe how biochemical events involving cyclins and CDKs might control passage of a dividing cell through the cell cycle.
Which of the following would be expressed at varying levels during different parts of the cell cycle? A. cyclin-dependent kinases B. RNA polymerase C. cyclins D. Glycolysis enzymes
Normally functioning cell cycle regulators are molecular signals that do all of the following EXCEPT: Inhibit progression through the cell cycle Stimulate progression through the cell cycle Instruct cells to progress from M phase directly to G2 phase during the cell cycle Instruct cells to initiate programmed cell death during development Instruct cells to differentiate during development
Which subunits activate CDKs at different cellcycle stages. Cyclins are present only in the cell cycle stagesthat they promote.
Oscillations in the activity of which protein family propels the cell cycle forward and creates abrupt transitions between different cell cycle states? prophases kinetochores cyclin-dependent kinases microtubules
What are divided into four classes defined by their pres-ence and activity during specific phases of the cell cycle: G1 cyclins, G1/S phase cyclins,
Which of the following statements is a lie?Select one: a. If damaged DNA is detected during the cell cycle, negative regulation is responsible in stopping the cell cycle. b. There are four cyclin proteins involved in the positive regulation of the cell cycle and they have fluctuating levels. c. To activate cyclin-dependent kinases (Cdks), they must bind to another kinase.
Which of the following statements is true regarding cell cycle regulators? a. Cyclins determine which proteins each Cdks will act on. b. Cdks check the DNA for damage and repairs it. c. Cyclin binding to Cdks will result to Cdk inactivation. d. Cyclin levels remain constant through the cell cycle.
What from mitosis is triggered by mitotic CDK inactivationmainly brought about by mitotic cyclin degradation.
Q. Cyclins and CDK(inase) complexes regulate the cell cycle. Which of the following statements is true? A. Cyclins activate CDKs which remove phosphates from other proteins. B. Cyclins activate CDKs which add phosphates to other proteins. C. CDKs activate cyclins which remove phosphates from other proteins. D. CDKs activate cyclins which add phosphates to other proteins.
During mitosis, cytoplasmic genes segregate into daughter cells during: more than one of the options listed here anaphase metaphase telophase and cytokinesis prophase
which of the following represents the amount of DNA in a typical human somatic Cell at the G2 stage of the cell cycle?n= number of chromosomes n 2n 4n 8n