BIOL2000 Lecture 15: Lecture 15-Cell Cycle

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magentamarten253

2 Apr 2016

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Control of the cell cycle: length can vary. Mitosis and s phase doesn"t change in time. Intervals of g1 and g2 can be shortened, lengthened, or eliminated: rate of cell division due to environmental factors. Mitosis-promoting factor: present in the cytoplasm of m-phase cells, induces mitosis in all eukaryotes, structure. Represents a paradigm for the proteins, cyclin b and cdk1 regulation and function. Cdk only active when bound with cyclin: cdk remains constant but cyclin levels oscillates and peaks during the m phase, function. Activated mpf has cyclin and cdk1 and removed phosphates. Initiates nuclear envelope breakdown (phosphorylate nuclear lamins) Activates mitotic spindle (phosphorylates microtubule associated proteins) Related cyclins were discovered for the other cell cycles: cyclin d and cdk4/6 g1 phase, cyclin a and cdk2 s phase, all cdk and cyclin levels are regulated. Friday, april 1, 2016: cyclin-cdk regulation is controlled by. Phosphates also regulate the cyclin-cdk activity: cycle checkpoints.

Related Questions

Part A:

In prokaryotes and eukaryotes cell reproduction is similar in that it requires some kind of signal to proceed, DNA replication, careful separation of the DNA into two equal portions, and division of the cytoplasm. How is cell reproduction different in prokaryotes and eukaryotes?

Select one:

a. In a eukaryotic organism, the signals for cell division are usually not related to the environment but to the function of the entire organism.

b. Eukaryotic cells constantly divide whenever environmental conditions are adequate and the cells are large enough.

c. The linear chromosomes in prokaryotes are constantly being updated.

d. Prokaryotic cell division requires cytokinesis before mitosis because of their small size.

e. The sexual phase of most prokaryotes (bacteria) is essential to the rapid cell division required for infection.

Part B:

What does the name Cyclin Dependent Kinase stand for?

Select one:

a. A protein important to the cell cycle that is dependent on DNA synthesis.

b. An enzyme that cuts DNA so that chromosomes can segregate.

c. An enzyme that phosphorylates other proteins using ATP only when the protein Cyclin is bound to the enzyme.

d. An enzyme that rolls along microtubules dragging a vesicle.

e. An enzyme that connects chromosomes to the spindle fiber.

Part C:

The Cell Cycle is divided into Mitosis, Cytokinesis, and Interphase. Mitosis can be ordered into the following phases:

Select one:

a. Prophase/Prometaphase/Metaphase/Anaphase/Telophase

b. Anaphase/Prometaphase/Metaphase/Prophase/Telophase

c. Metaphase/Anaphase/Telophase/Prophase/Prometaphase

d. Telophase/Prophase/Prometaphase/Metaphase/Anaphase

e. Anaphase/Telophase/Prophase/Prometaphase/Metaphase

Part D:

The Cell Cycle is divided into Mitosis, Cytokinesis, and Interphase. Interphase can be ordered into the following phases:

Select one:

a. S/G1/G2

b. G2/G1/S

c. G1/S/G2

d. G2/S/G1

e. G1/G2/S

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BIOL2000 Lecture 15: Lecture 15-Cell Cycle

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